1. Technical Field
Aspects of the present disclosure relate generally to methods and devices for acquiring electrodermal activity.
2. Background
Electrodermal activity (EDA) is measured in microsiemens (μS) and is a term that refers to how well the skin conducts electricity when an external direct current (DC) or constant voltage is applied. That is, the EDA measures the electrical conductance of the skin of an individual, which varies with its moisture level from sweat emanating from the eccrine sweat glands that are found all over the body but most dense on the palms of the hands and soles of the feet. Electrodermal activity (EDA) is also known as skin conductance, galvanic skin response (GSR), electrodermal response (EDR), psychogalvanic reflex (PGR) and skin conductance response (SCR).
Standard silver-silver chloride (Ag/AgCl) electrodes are typically used for measurement of electrodermal activity and other biopotential signals since they are practically non-polarizable.
Currently electrodermal recording devices exist that are used in laboratory settings for measuring electrodermal activity. All devices currently on the market consist of some type of wearable electrodes, typically fixed to the distal or medial phalanges of the first two fingers (e.g., Thought Technology™) of the individual, for measuring the electrodermal activity. Another wearable device currently on the market is the Affectiva Q Sensor™ which attaches to the wrist of the individual.
However, no device exists that can be gripped by an individual to accurately measure electrodermal activity which could be deployed in a handheld form factor. Applications requiring reliable measurement of electrodermal activity (EDA) from the surface of a handheld device would require dry, reusable electrodes that are durable and malleable around curved surfaces. While it may be possible to use sintered Ag/AgCl electrodes in such a device, they are somewhat expensive and their durability and malleability are questionable. It may also be possible to use common stainless steel electrodes as they are very cost effective, however, stainless steel electrodes perform poorly when passing DC currents as they easily polarize.
There are three (3) major obstacles to designing a handheld device for measuring electrodermal activity. These obstacles include the material of the electrode, the configuration of the electrode and the grip force, as changing the grip force and grip force that is too firm can result in distortion of the electrodermal signal.
The following presents a simplified summary of one or more aspects of the present disclosure, in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated features of the disclosure, and is intended neither to identify key or critical elements of all aspects of the disclosure nor to delineate the scope of any or all aspects of the disclosure. Its sole purpose is to present some concepts of one or more aspects of the disclosure in a simplified form as a prelude to the more detailed description that is presented later.
In one aspect, the disclosure provides a device, such as a mobile phone, for acquiring electrodermal activity. The device may comprise an array of stainless steel electrodes located on the edges and/or back of the device for the acquiring electrodermal activity of an individual holding the device. A polarity switching module may be coupled to the array of stainless steel electrodes for switching polarity of electrodes in the array of stainless steel electrodes to prevent polarization of the stainless steel electrodes for skin conductance measurements. The device may also include a memory device that may include operations (instructions) for storing received input (or incoming) signals and/or feedback signals from the array of stainless steel electrodes (i.e. electrodermal activity data).
At least one processor may be coupled to the array of stainless steel electrodes and the memory device and configured to determine a number of adjacent electrode pairs in the array of stainless steel electrodes that have come into contact with the skin, such as the hands, of an individual to scale a skin conductance response threshold. Next, the processor may be configured to fuse all the negative electrodes together and all positive electrodes together in the array of stainless steel electrodes upon activation of the electrodes in the array of stainless steel electrodes. The electrodes in the array of electrodes are activated upon the electrodes on the device becoming active and alternating in polarity, e.g. + − + − + − + − . To alternate polarity, the current flow direction through the one or more electrode pairs in the array of stainless steel electrodes may be reversed as each electrode pair becomes active. The processor may then be configured to measure a single overall skin conductance response to capture a total electrode activity measurement and automatically adjust the skin conductance response threshold to count legitimate skin conductive responses using the number of contacted electrode pairs, wherein the counted legitimate skin conductive responses is a determination of arousal.
In one example, the total electrodermal activity measurement measures a reaction of an individual to an advertisement that has appeared on the device. In another example, the total electrodermal activity measurement may be used to track stress levels of an individual. A graph of the total electrodermal activity measurement captured over time may be generated and an index of emotional arousal based on historical data may be computed.
In another aspect, the device may also include a force sensor array coupled to each electrode pair in the array of stainless steel electrodes for detecting grip force. Grip force is the force that may temporarily be applied by an individual to the stainless steel electrodes on the device. Changing grip force or applying too much grip force can result in distortion of the electrodermal signal on the device which in turn may create false-positive and false-negative artifacts in the data. Using data obtained from the force sensor array, the at least one processor may be further configured to invalidate captured electrodermal activity data if the grip force changes or if the grip force exceeds a grip force threshold.
The array of stainless steel electrodes may be embedded on a right side and a left side of the device where the array of stainless steel electrodes is interleaved down the sides and back of the device. The array of stainless steel electrodes may also be embedded on an upper edge portion and a lower edge portion wrapping around to a backside of the device.
In yet another aspect, the disclosure provides a method for acquiring electrodermal activity on a device using an array of stainless steel electrodes embedded on the device. The method may include determining a number of adjacent electrode pairs in the array of stainless steel electrodes contacted to scale a skin conductance response threshold; fusing all negative electrodes together and all positive electrodes together in the array of stainless steel electrodes upon activation of electrodes in the array of stainless steel electrodes; measuring a single overall skin conductance response to capture a total electrode activity measurement; and automatically adjusting the skin conductance response threshold to count legitimate skin conductance responses using the number of contacted electrode pairs, where the counted legitimate skin conductive responses is a determination of arousal.
In one example, the method may further comprise detecting grip force from the temporary gripping of the one or more electrode pairs in the array of stainless steel electrodes and invalidating captured electrodermal activity data if the grip force changes or if the grip force exceeds a grip force threshold. Additionally, the method may comprise reversing the current flow direction through the one or more electrode pairs in the array of stainless steel electrodes as each electrode pair is activated; generating a graph of the total electrodermal activity measurement captured over a period of time; and computing an index of emotional arousal based on historical data.
In yet another aspect, the disclosure provides a device, such as a mobile phone, for acquiring electrodermal activity where the device comprises means for determining a number of adjacent electrode pairs in an array of stainless steel electrodes contacted to scale a skin conductance response threshold; means for fusing all negative electrodes together and all positive electrodes together in the array of stainless steel electrodes upon activation of electrodes in the array of stainless steel electrodes; and means for measuring a single overall skin conductance response to capture a total electrode activity measurement. The device may further comprise means for detecting a grip force change from the temporary gripping of the one or more electrode pairs in the array of stainless steel electrodes and means for invalidating captured electrodermal activity data if the grip force changes or if grip force exceeds a grip force threshold.
The device may further comprise means for reversing the current flow direction through the one or more electrode pairs in the array of stainless steel electrodes as each electrode pair is activated; means for generating a graph of the total electrodermal activity measurement captured over a period of time; and means for computing an index of emotional arousal based on historical data. Additionally, the device may comprise means for automatically adjusting the skin conductance response threshold to count legitimate skin conductance responses using the number of contacted electrode pairs, where the counted legitimate skin conductive responses is a determination of arousal.
These and other aspects of the disclosure will become more fully understood upon a review of the detailed description, which follows.
The accompanying drawings, together with the specification, illustrate exemplary embodiments of the present invention, and, together with the description, serve to explain the principles of the present disclosure.
Elements and steps in the figures are illustrated for simplicity and clarity and have not necessarily been rendered according to any particular sequence. For example, steps that may be performed concurrently or in different order are illustrated in the figures to help to improve the understanding of various aspects of the disclosure.
The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well known structures and components are shown in block diagram form in order to avoid obscuring such concepts.
The word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any implementation or embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments. Likewise, the term “embodiments” does not require that all embodiments include the discussed feature, advantage or mode of operation.
The term “handheld device” may refer to a mobile device, a wireless device, a mobile phone, a mobile communication device, a user communication device, personal digital assistant, mobile palm-held computer, a laptop computer, remote control and/or other types of mobile devices typically carried by individuals and/or having some form of communication capabilities (e.g., wireless, infrared, short-range radio, etc.).
While the present disclosure is described primarily with respect to handheld devices, the present disclosure may be applied and adapted to various devices. The present disclosure may be applied to any type of device that can be gripped, held or come into contact with skin of an individual, including but not limited to, handle bars on exercise equipment, such as a treadmill, biofeedback therapy devices and user interfaces, such as a mouse for a computer, where there is a desire for measuring electrodermal activity. Also, a variety of other embodiments are contemplated having different combinations of the below described features of the present disclosure, having features other than those described herein, or even lacking one or more of those features. As such, it is understood that the disclosure can be carried out in various other suitable modes.
Devices using stainless steel electrodes pairs located on the edges and/or back of the devices for acquiring electrodermal activity are provided. The stainless steel electrodes may allow for skin conductance or electrodermal activity (EDA) of an individual to be measured and collected. The polarity of the stainless steel electrodes pairs may change to prevent polarization of the stainless steel electrodes for skin conductance measurements. Electrodermal activity reflects sympathetic nervous system activation and is related to a major component of human emotion known as arousal (Boucsein, 1992). Emotional arousal is similar to emotional intensity which is orthogonal to emotional valence, the other major component in human emotion which EDA may not measure well. Valence is an evaluative component (e.g., positive, negative) as proposed by the circumplex model of affect (Russell, 1980). For example, high emotional arousal may be experienced in various emotional states, such as anxiety, stress, fear, or anger (which are negative states) or more positive states such as excitement.
According to one feature, the skin conductance data collected may be used for marketing purposes. For example, a handheld device may be used to sense how an individual reacts to an advertisement that has appeared on the handheld device. The individual may be provided with a discount or other reward to opt-in or participate in this feature.
According to another feature, the skin conductance data collected may be used with wireless health applications. For example, the handheld device may be used to track stress levels of an individual. The health application on the handheld device may use the collected data to generate a graph of the individual's skin conductance level over a specific time period, such as on a daily basis. The individual may then use this information in a biofeedback application, for example, to adjust their EDA downwards to a more relaxing state. Additionally, the skin conductance data collected may be shared with medical professionals.
According to another feature, the collected skin conductance data may be used in a variety of other applications. For example, collected skin conductance data may be used in connection with gaming to determine the emotions, emotional state or emotional arousal of the individual or that of competing players. For example, the game may take input for one or more individuals' emotional state. The emotional state of the one or more individuals may make inferences about the individuals. If emotional arousal is increasing, it may be inferred that the individual is excited by the game or is getting so aroused that the individual is not doing well and the game may automatically become easier by shifting to a different, easier level. Conversely, if the data indicates the individual is bored, the game may automatically become more difficult. That is, the data may be used as a feedback loop that allows the difficulty of the game to be adjusted in real time.
The collected skin conductance data may also be used in connection with social networking. When an individual is logged onto his/her social network page, such as Facebook®, using a handheld device, the collected skin conductance data may be used to update the status of the individual on social network page (e.g., the individual is stressed out). In other words, the collected skin conductance data may be used as a user interface enhancement or for contextual awareness, similar to that of gaming as described above. Based on the data, the user interface may become more engaging or less engaging or stimulating.
To collect skin conductance data, electrodes may be located on the edges and/or back of the handheld devices such that when an individual temporarily grips the device the skin conductance of the individual is easily measured. As discussed above, standard silver-silver chloride (Ag/AgCl) electrodes are typically used for acquiring electrodermal activity and other biopotential signals (e.g., electrocardiogram (ECG), electromyography (EMG)).
As shown, a salt solution 106, such as a 1% salt solution found in human sweat, may be located between a positive (+) Ag/AgCl electrode and a negative (−) Ag/AgCl electrode. The salt solution 106 may be aqueous sodium chloride (NaCl), which contains both sodium ions (Na+) and chloride ions (Cl−) ions. When a small direct current (DC) voltage is applied to Ag/AgCl electrodes (e.g., +0.5 v DC typically to measure skin conductance), the Chloride on the negative electrode 104 dissolves and the negatively charged Cl-ion migrates to the positive electrode 102 where it combines with silver (Ag) to form AgCl plus a free electron. Thus, Ag/AgCl operates as a transducer between ion flow in human sweat (NaCl) and electron flow in the circuit which allows skin conductance to be accurately calculated. Although Ag/AgCl electrodes work well, the sintered Ag/AgCl electrodes are very expensive and although the sintered Ag/AgCl electrodes are durable, they do not conform well to curved surfaces. With regard to the printed type of Ag/AgCl electrodes, the Ag/AgCl electrodes have a thin Ag/AgCl layer that will wear away after many uses and will also oxidize over time. Thus, the printed type of Ag/AgCl electrodes cannot be used on the housing of a device that will be repeatedly used, perhaps over a period of years.
As shown in
An electrical double layer may form after the electrodes are excited with a direct current and cause an error voltage to appear between the electrodes and skin that opposes the applied voltage. The net effect, known as “electrode polarization”, reduces current flow through the circuit and causes the calculated skin conductance to approach zero and be practically unusable. Electrode polarization on stainless steel begins very quickly and progressively increases.
Moreover, the polarization effect may be dependent on the material of the electrodes. As shown in
According to one example, the polarity of the pair of stainless steel electrodes may be switched every 100 msec (10 Hz switching frequency) between +0.5 v and −0.5 v. Once the circuit and skin in contact with the pair of stainless steel electrodes has the opportunity to settle, the conductance measured during the +0.5 V state may be sampled, resulting in a final output sample rate of 5 samples per second.
As shown in both
The data in the graphs of
Using common stainless steel electrodes (without polarity switching) for skin conductance measurement has suggested that electrode polarization on stainless steel begins very quickly and progressively increases. By using the polarity switching circuit of
Skin conductance may be dictated by the electrode (positive or negative) with the least amount of skin contact. As such, in one example, an electrode arrangement that allows for an even distribution of positive and negative electrode area contacted by the skin no matter how the device is gripped is provided. Furthermore, the arrangement of individual electrode segments and adjusting for the number of electrodes contacted may allow the sensor to be accurate regardless of how the device is being gripped. As such, the individual does not have to think where and how to grip the device.
Additionally, since counting SCRs (skin conductance responses) is typically done by using an absolute threshold level for standard 1 cm diameter Ag/AgCl electrodes (typically 0.05 microsiemens), methods that can allow the threshold to adjust depending on how many positive/negative electrode pairs are contacted at any point in time as the device is gripped in different ways is provided.
Fusing Positive and Negative Electrodes
One method for allowing the skin conductance response threshold to adjust, depending on how many positive/negative electrode pairs are contacted at any point in time as the device is gripped in different ways, includes fusing positive electrodes in the array together and the negative electrodes in the array together. The method may briefly “scan” each adjacent electrode pair individually by sampling skin conductance for each electrode pair. If the skin conductance for an adjacent pair of electrodes exceeds a certain threshold value (e.g., 0.1 microsiemens), that pair of electrodes has been touched. The measured skin conductance is not being added together or totaled up; it is merely used to determine if an electrode pair has been touched.
As each adjacent electrode pair is scanned, the electrode pair is activated. i.e., the electrodes on the device become active and alternate in polarity, e.g. + − + − + − + − . Next, all the positive electrodes are fused together (i.e. every other electrode in the array) and all the negative electrodes are fused together (i.e. every other electrode in the array).
One method for allowing the threshold to adjust, depending on how many positive/negative electrode pairs are contacted at any point in time as the device is gripped in different ways, includes combining the electrodermal activity data to determine a total electrodermal activity measurement. The method may briefly “measure” each adjacent electrode pair individually by sampling skin conductance for each pair. If a threshold is exceeded (e.g., 0.1 microsiemens), the electrode pair is determined as contacted and counted in a total of contacted electrode pairs and the skin conductance from each contacted pair is totaled for a total skin conductance level result. The SCR threshold level may then be adjusted based on the number of electrodes contacted to determine if an SCR occurred. Such a strategy may also automatically reverse the polarity of each electrode as each immediately adjacent electrode pair is individually scanned.
As shown, the back of the device may contain a plurality of rows and columns of electrodes that are approximately 4 mm×4 mm squares where each row and column of electrodes may be approximately 2 mm spaced apart on all sides, i.e. one square has a 2 mm gap around it. According to one example, making each electrode pair roughly the average size of a human fingertip may ensure an even contact area for positive and negative electrodes no matter how the device is contacted. As shown, only a single electrode pair is activated at any one time. Sampling each electrode pair automatically reverses the polarity. Furthermore, as described above, each electrode pair may be briefly scanned individually by sampling skin conductance for each pair, then adding the skin conductance from each contacted pair for a total result, then adjusting the threshold level based on number of pairs contacted to determine if an SCR occurred. Such a strategy may also automatically reverse the polarity of each electrode as each immediately adjacent electrode pair is individually scanned.
As shown, interleaving positive and negative electrode pairs on the top and bottom portions of the device can maximize an even distribution of electrodes. According to one example, making each electrode pair roughly the average size of a human fingertip may ensure an even contact area for positive and negative electrodes no matter how the device is contacted. A single electrode pair may be activated at any one time. Sampling each electrode pair automatically reverses the polarity. Furthermore, as described above, each adjacent electrode pair may be briefly scanned individually by sampling skin conductance for each pair to determine which electrode pairs have been touched. Next, all the positive electrodes may be fused together and all the negative electrodes may be fused together and then one overall skin conductance measurement may be taken to capture total electrodermal activity measurement. The SCR threshold level may then be automatically adjusted based on number of electrodes contacted to determine if an SCR occurred. Alternatively, as described above, each adjacent electrode pair may be briefly measured individually by sampling skin conductance for each pair, then adding the skin conductance from each contacted pair for a total result, then adjusting the threshold level based on number of pairs contacted to determine if an SCR occurred. Such a strategy may also automatically reverse the polarity of each electrode as each immediately adjacent electrode pair is individually scanned.
Grip force is the force that may temporarily be applied by an individual to the stainless steel electrodes on the handheld device. Changing grip force or applying too much grip force can result in distortion of the electrodermal signal on the handheld device which in turn may create false-positive and false-negative artifacts in the data.
According to one embodiment, incorporating an array of force sensors, under the electrodermal electrode array, may allow changes in grip force to be captured and for static grip force to be monitored. Skin conductance data could be invalidated when grip force is changing or if grip force is greater than some critical threshold as determined in a calibration stage.
Exemplary Handheld Device and Operations Therein
The handheld device 1800 may also include a communication interface 1806 for communicatively coupling the handheld device 1800 to a wireless communication network as well as a stainless steel electrode array 1808 located on high contact locations, such as the side of the handheld device 1800. In one example, the stainless steel electrode array 1808 may include ten (10) curved electrode pairs on the sides of the handheld device 1800 so that equal portions of +/−electrodes may be contacted no matter how the device 1800 is gripped. In another example, the stainless steel electrode array 1808 may be an interleaved electrode array layout on the back of the handheld device. In yet another example, the stainless steel electrode array 1808 may include a plurality of electrodes located on the top and bottom edge portion wrapping around onto the back of a handheld device. The number of electrodes in the plurality of electrodes may vary with based on the length and/or width of the device. For example, the stainless steel electrode array 1808 may include ten (10) electrodes, one hundred (100) electrodes, less than ten (10) electrodes, between ten (10) electrodes and one hundred (100) electrodes or more than one hundred (100) electrodes. The electrodermal activity data from each pair of electrodes may be combined into a total electrodermal activity measurement. In one example, the electrodermal activity data may be in the form of a skin conductance signal and obtained by scanning each adjacent electrode pair, fusing the positive electrodes together and fusing the negative electrodes together and then taking one overall skin conductance measurement to capture total electrodermal activity measurement. In another example, the electrodermal activity data may be in the form of a skin conductance signal from each pair of electrodes and combining all the signals determines a total skin conductance level.
The handheld device 1800 may also include a polarity switching module 1810 coupled to the array of stainless steel electrodes 1808 embedded on the handheld device, for switching polarity of the electrode pairs in the array so that the current flow direction through the skin is reversed in a periodic manner at regular intervals. Additionally, an array of force sensors 1812 may be located under the array of electrode pairs 1808 for detecting grip force. If the grip force exceeds a threshold or the grip force is changing, the skin conductance measured may have artifacts and may not accurately reflect emotional arousal.
First, the number of electrode pairs that have been touched or gripped may be determined so that a skin conductance response (SCR) threshold can be scaled 1902. That is, the threshold may be adjusted depending on how many positive/negative electrode pairs are contacted at any point in time the device is gripped.
Next the current flow direction through the one or more electrode pairs in the array of stainless steel electrodes may be reversed as each adjacent electrode pair may be activated 1904. Next, all negative electrodes may be fused together and all positive electrodes may be fused together in the array of stainless steel electrodes upon activation of electrodes in the array of stainless steel electrodes 1906. The electrodes in the array of electrodes are activated upon the electrodes on the device becoming active and alternating in polarity, e.g. + − + − + − + − . Once all the positive electrodes are fused together and all the negative electrodes are fused together, a single (i.e. one) overall skin conductance measurement may be taken to capture a total electrodermal activity measurement 1908. The SCR threshold may then be automatically adjusted to count legitimate SCRs using the number of contacted electrode pairs 1910.
The total counted legitimate skin conductive responses may be a determination of the arousal of the individual. As SCR amplitude increases with increased surface area contacted, adapting the SCR threshold downwards may make it easier to find SCRs when only a few electrodes are touched than when many electrodes are touched. Optionally, the total electrodermal activity measurement captured over a period of time may be generated, in a graph for example, and an index of emotional arousal based on historical data may be computed 1912. An individual may then use this information in a biofeedback application for example to automatically adjust their skin conductance level to a lower value resulting in a more relaxed subjective state.
Alternatively, an index of arousal can be calculated based on the history or a individual's skin conductance data and fed into an application running on the device such as a game, social networking application or any other application running on the device that could make use of the individual's basic emotional status.
Changing grip force or grip force that is too great on the electrode pairs in the array of stainless steel electrodes can result in distortion of the electrodermal activity data on the handheld device which in turn may create false-positive and false-negative artifacts in the data. As such, independent of the electrode switching and scanning, to compensate for the possible false-positive and false-negative artifacts in the data, if the grip force is greater than a threshold or if the grip force is changing, captured electrodermal activity data may be invalidated.
First, the number of electrode pairs that have been touched or gripped may be determined so that a skin conductance response (SCR) threshold can be scaled 2002. That is, the threshold may be adjusted depending on how many positive/negative electrode pairs are contacted at any point in time the device is gripped.
Next the current flow direction through the one or more electrode pairs in the array of stainless steel electrodes may be reversed as each adjacent electrode pair may be activated 2004. The electrodermal activity data from the touched electrode pairs in the array of stainless steel electrodes may be combined to determine a total electrodermal activity measurement 2006. If the skin conductance level sampled exceeds some specified level (e.g., 0.1 microsiemens) then the electrode pair can be considered touched or contacted.
The total counted legitimate skin conductive responses may be a determination of the arousal of the individual. As SCR amplitude increases with increased surface area contacted, adapting the SCR threshold downwards may make it easier to find SCRs when only a few electrodes are touched than when many electrodes are touched. The SCR threshold may then be automatically adjusted to count legitimate SCRs using the number of contacted electrode pairs 2008.
Optionally, the total electrodermal activity measurement captured over a period of time may be generated, in a graph for example, and an index of emotional arousal based on historical data may be computed 2010. An individual may then use this information in a biofeedback application for example to automatically adjust their skin conductance level to a lower value resulting in a more relaxed subjective state.
Alternatively, an index of arousal can be calculated based on the history or an individual's skin conductance data and fed into an application running on the device such as a game, social networking application or any other application running on the device that could make use of the individual's basic emotional status.
Changing grip force or grip force that is too great on the electrode pairs in the array of stainless steel electrodes can result in distortion of the electrodermal activity data on the device which in turn may create false-positive and false-negative artifacts in the data. As such, independent of the electrode switching and scanning, to compensate for the possible false-positive and false-negative artifacts in the data, if the grip force is greater than a threshold or if the grip force is changing, captured electrodermal activity data may be invalidated.
In the foregoing specification, certain representative aspects of the invention have been described with reference to specific examples. Various modifications and changes may be made, however, without departing from the scope of the present invention as set forth in the claims. The specification and figures are illustrative, rather than restrictive, and modifications are intended to be included within the scope of the present invention. Accordingly, the scope of the invention should be determined by the claims and their legal equivalents rather than by merely the examples described.
For example, the steps recited in any method or process claims may be executed in any order and are not limited to the specific order presented in the claims. Additionally, the components and/or elements recited in any apparatus claims may be assembled or otherwise operationally configured in a variety of permutations and are accordingly not limited to the specific configuration recited in the claims.
Furthermore, certain benefits, other advantages and solutions to problems have been described above with regard to particular embodiments; however, any benefit, advantage, solution to a problem, or any element that may cause any particular benefit, advantage, or solution to occur or to become more pronounced are not to be construed as critical, required, or essential features or components of any or all the claims.
As used herein, the terms “comprise,” “comprises,” “comprising,” “having,” “including,” “includes” or any variation thereof, are intended to reference a non-exclusive inclusion, such that a process, method, article, composition or apparatus that comprises a list of elements does not include only those elements recited, but may also include other elements not expressly listed or inherent to such process, method, article, composition, or apparatus. Other combinations and/or modifications of the above-described structures, arrangements, applications, proportions, elements, materials, or components used in the practice of the present invention, in addition to those not specifically recited, may be varied or otherwise particularly adapted to specific environments, manufacturing specifications, design parameters, or other operating requirements without departing from the general principles of the same.
In one configuration, the interactive handheld device 1800 for acquiring electrodermal activity array of stainless steel electrodes embedded on the handheld device includes means for determining a number of adjacent electrode pairs in the array of stainless steel electrodes contacted to scale a skin conductance response threshold; means for fusing together negative and positive electrode pairs in the array of stainless steel electrodes; means for measuring a single overall skin conductance response to capture a total electrode activity measurement; means for detecting a grip force change from the temporary gripping of the one or more electrode pairs in the array of stainless steel electrodes; means for invalidating captured electrodermal activity data if changing grip force or if grip force exceeds a grip force threshold; and means for reversing reverse the current flow direction through the one or more electrode pairs in the array of stainless steel electrodes as each electrode pair is activated. In one aspect, the aforementioned means may be the processor(s) 1802 configured to perform the functions recited by the aforementioned means. In another aspect, the aforementioned means may be a module or any apparatus configured to perform the functions recited by the aforementioned means.
Moreover, in one aspect of the disclosure, the processing circuit 1802 illustrated in
It is to be understood that the specific order or hierarchy of steps in the methods disclosed is an illustration of exemplary processes. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the methods may be rearranged. The accompanying method claims present elements of the various steps in a sample order, and are not meant to be limited to the specific order or hierarchy presented unless specifically recited therein.
The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but are to be accorded the full scope consistent with the language of the claims, wherein reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more.” Unless specifically stated otherwise, the term “some” refers to one or more. A phrase referring to “at least one of” a list of items refers to any combination of those items, including single members. As an example, “at least one of: a, b, or c” is intended to cover: a; b; c; a and b; a and c; b and c; and a, b and c. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. No claim element is to be construed under the provisions of 35 U.S.C. §112, sixth paragraph, unless the element is expressly recited using the phrase “means for” or, in the case of a method claim, the element is recited using the phrase “step for.”
Also, it is noted that the embodiments may be described as a process that is depicted as a flowchart, a flow diagram, a structure diagram, or a block diagram. Although a flowchart may describe the operations as a sequential process, many of the operations can be performed in parallel or concurrently. In addition, the order of the operations may be re-arranged. A process is terminated when its operations are completed. A process may correspond to a method, a function, a procedure, a subroutine, a subprogram, etc. When a process corresponds to a function, its termination corresponds to a return of the function to the calling function or the main function.
Moreover, a storage medium may represent one or more devices for storing data, including read-only memory (ROM), random access memory (RAM), magnetic disk storage mediums, optical storage mediums, flash memory devices and/or other machine-readable mediums, processor-readable mediums, and/or computer-readable mediums for storing information. The terms “machine-readable medium”, “computer-readable medium”, and/or “processor-readable medium” may include, but are not limited to non-transitory mediums such as portable or fixed storage devices, optical storage devices, and various other mediums capable of storing, containing or carrying instruction(s) and/or data. Thus, the various methods described herein may be fully or partially implemented by instructions and/or data that may be stored in a “machine-readable storage medium”, “computer-readable storage medium”, and/or “processor-readable storage medium” and executed by one or more processors, machines and/or devices.
Furthermore, embodiments may be implemented by hardware, software, firmware, middleware, microcode, or any combination thereof. When implemented in software, firmware, middleware or microcode, the program code or code segments to perform the necessary tasks may be stored in a machine-readable medium such as a storage medium or other storage(s). A processor may perform the necessary tasks. A code segment may represent a procedure, a function, a subprogram, a program, a routine, a subroutine, a module, a software package, a class, or any combination of instructions, data structures, or program statements. A code segment may be coupled to another code segment or a hardware circuit by passing and/or receiving information, data, arguments, parameters, or memory contents. Information, arguments, parameters, data, etc. may be passed, forwarded, or transmitted via any suitable means including memory sharing, message passing, token passing, network transmission, etc.
The various illustrative logical blocks, modules, circuits, elements, and/or components described in connection with the examples disclosed herein may be implemented or performed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic component, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing components, e.g., a combination of a DSP and a microprocessor, a number of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
The methods or algorithms described in connection with the examples disclosed herein may be embodied directly in hardware, in a software module executable by a processor, or in a combination of both, in the form of processing unit, programming instructions, or other directions, and may be contained in a single device or distributed across multiple devices. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. A storage medium may be coupled to the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor.
Those of skill in the art would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.
The various features of the invention described herein can be implemented in different systems without departing from the disclosure. It should be noted that the foregoing embodiments are merely examples and are not to be construed as limiting the invention. The description of the embodiments is intended to be illustrative, and not to limit the scope of the claims. As such, the present teachings can be readily applied to other types of apparatuses and many alternatives, modifications, and variations will be apparent to those skilled in the art.
The present application for patent claims priority to Provisional Application No. 61/651,955 entitled “METHODS AND DEVICES FOR ACQUIRING ELECTRODERMAL ACTIVITY ON A HANDHELD DEVICE USING STAINLESS STEEL ELECTRODES” filed May 25, 2012, and assigned to the assignee hereof and hereby expressly incorporated by reference herein.
Number | Date | Country | |
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61651955 | May 2012 | US |