Systems and methods for detecting deception by measuring brain activity

Abstract

Methods for determining whether the brain activity of a human subject in response to a stimulus of interest or question of interest is characteristic of a state of interest, such as a deceptive state or a truthful state, are disclosed. Some methods include the use of control questions, including truthful control questions and deceptive control questions, to provide bases for comparison for responses to stimuli of interest or questions of interest. In some methods, brain maps are generated and compared. Also disclosed are systems for detecting deception by measuring brain activity.

1 . A method for determining whether brain activity of a human subject in response to a stimulus of interest is characteristic of a truthful state or a deceptive state, comprising the steps of:
 (a) providing a stimulus of interest;   (b) measuring brain activity of said subject in response to said stimulus during a period of interest;   (c) generating a first brain map of activity prior to or after said period of interest;   (d) generating a second brain map of activity during said period of interest; and   (e) generating a third brain map of activity representing the difference between said first brain map and said second brain map; and   (f) determining whether the brain activity in at least one brain region of said third brain map of activity exceeds a predetermined control level of activity,   wherein the brain activity in said at least one brain region of said third brain map of activity is characteristic of said truthful state or said deceptive state if it exceeds said predetermined control level of activity.   
     
     
         2 . The method of  claim 1  wherein said stimulus is selected from the group consisting of a sound, a picture, an aurally-presented question and a visually-presented question. 
     
     
         3 . The method of  claim 1  wherein said third brain map includes data representing values of statistical significance or probabilities. 
     
     
         4 . The method of  claim 1  wherein said control level of activity is a level which is characteristic of either said truthful response or said deceptive response to control questions by said subject. 
     
     
         5 . The method of  claim 1  further comprising the steps of:
 measuring a physiological indicator at least once during said period of interest, wherein said indicator is selected from the group consisting of skin conductance response (SCR), heart rate and blood pressure; and 
 determining whether said indicator when measured during said period of interest is characteristic of the truthful or the deceptive response. 
 
     
     
         6 . The method of  claim 1  wherein said control level of activity is a level which is characteristic of either the truthful response or the deceptive response by a group of individuals. 
     
     
         7 . The method of  claim 1  wherein brain activity of said subject is measured by fMRI or BOLD fMRI. 
     
     
         8 . The method of  claim 1  wherein measuring brain activity of said subject occurs multiple times during said period of interest. 
     
     
         9 . A method for determining whether brain activity of a human subject during a response to a question of interest is characteristic of a truthful or a deceptive response, comprising the steps of:
 (a) asking said subject at least one question of interest, allowing said subject to provide a response of interest during a period of interest, wherein it is not known beforehand whether said response of interest is truthful or deceptive, and measuring brain activity of said subject during said period of interest;   (b) generating a first brain map of activity prior to or after said period of interest;   (c) generating a second brain map of activity during said period of interest; and   (d) generating a third brain map of activity representing the difference between said first brain map and said second brain map; and   (e) determining whether the brain activity in at least one brain of said third brain map of activity exceeds a predetermined control level of activity,   wherein the brain activity in said at least one brain region of said third brain map of activity is characteristic of said truthful or said deceptive response if it exceeds said predetermined control level of activity.   
     
     
         10 . The method of  claim 9  wherein said control level of activity is a level which is characteristic of either the truthful response or the deceptive response by a group of individuals. 
     
     
         11 . The method of  claim 9  wherein said control level of activity is a level which is characteristic of either said truthful response or said deceptive response to control questions by said subject. 
     
     
         12 . The method of  claim 9  wherein said response is selected from the group consisting of a motor, auditory, visual and pain response. 
     
     
         13 . The method of  claim 9  wherein said third brain map includes data representing values of statistical significance or probabilities. 
     
     
         14 . The method of  claim 9  further comprising the steps of:
 measuring a physiological indicator at least once during said period of interest, wherein said indicator is selected from the group consisting of skin conductance response (SCR), heart rate and blood pressure; and 
 determining whether said indicator when measured during said period of interest is characteristic of the truthful or the deceptive response. 
 
     
     
         15 . The method of  claim 9  wherein brain activity of said subject is measured by fMRI or BOLD fMRI. 
     
     
         16 . The method of  claim 9  wherein measuring brain activity of said subject occurs multiple times during said period of interest. 
     
     
         17 . A method for determining whether brain activity during a response of a human subject to a question of interest is characteristic of a truthful or a deceptive response, comprising the steps of:
 (a) asking said subject at least one truthful control question, allowing said subject to provide a response which is known to be a truthful response, and measuring brain activity of said subject during a truthful control period;   (b) asking said subject at least one deceptive control question, allowing said subject to provide a response which is known to be a deceptive response, and measuring brain activity of said subject during a deceptive control period;   (c) asking said subject at least one question of interest, allowing said subject to provide a response of interest during a period of interest, wherein it is not known beforehand whether said response of interest is truthful or deceptive, and measuring brain activity of said subject during said period of interest;   (d) identifying at least one brain region exhibiting a statistically significant difference in brain activity in said subject when measured during said truthful control period and when measured during said deceptive control period;   (e) generating a first brain map of activity during said period of interest;   (f) generating at least a second brain map of activity during at least one of said truthful control period and said deceptive control period; and   (g) generating at least a third brain map of activity representing the difference between said first brain map and said second brain map; and   (h) determining whether brain activity in at least one brain region of said third brain map of activity exceeds a predetermined control level of activity,   wherein the brain activity in said at least one brain region of said third brain map of activity is characteristic of said truthful or said deceptive response if it exceeds said predetermined control level of activity.   
     
     
         18 . The method of  claim 17  wherein said third brain map includes data representing values of statistical significance or probabilities. 
     
     
         19 . The method of  claim 17  further comprising the steps of:
 measuring a physiological indicator at least once during said period of interest, wherein said indicator is selected from the group consisting of skin conductance response (SCR), heart rate and blood pressure; and 
 determining whether said indicator when measured during said period of interest is characteristic of the truthful or the deceptive response. 
 
     
     
         20 . The method of  claim 17  wherein brain activity of said subject is measured by fMRI or BOLD fMRI. 
     
     
         21 . The method of  claim 17  wherein measuring brain activity of said subject occurs multiple times during said period of interest.