Polygraph automated scoring systems
First Claim
1. A method for automatically scoring by computer a polygraph test comprised of a plurality of relevant and control questions, the polygraph test generating a plurality of digitized physiological signals, the method comprising the steps of:
- transforming the digitized signals into a plurality of fundamental signals;
standardizing the fundamental signals;
extracting a plurality of features from the standardized fundamental signals at each question;
standardizing the features for all relevant questions against the features for all control questions;
determining an 80th percentile value of each standardized relevant feature; and
combining the 80th percentile values to produce a probability of deception.
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Abstract
A polygraph automated scoring system in which polygraph signals are input and a probability of deception is output. To begin the process, digitized polygraph signals are transformed into more fundamental signals. These fundamental signals are then subjected to standardization, a critical step. The standardized signals then have certain features extracted at each question. The features for all of the relevant questions are then standardized against the features for all of the control questions. From each of the resulting standardized relevant features, the 80th percentile is taken. Finally, a logistic regression model (logit) converts this set of 80th percentile features into a probability of deception.
36 Citations
36 Claims
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1. A method for automatically scoring by computer a polygraph test comprised of a plurality of relevant and control questions, the polygraph test generating a plurality of digitized physiological signals, the method comprising the steps of:
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transforming the digitized signals into a plurality of fundamental signals; standardizing the fundamental signals; extracting a plurality of features from the standardized fundamental signals at each question; standardizing the features for all relevant questions against the features for all control questions; determining an 80th percentile value of each standardized relevant feature; and combining the 80th percentile values to produce a probability of deception. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for automatically scoring by computer a polygraph test, the polygraph test generating a plurality of digitized physiological signals, the method comprising the steps of:
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extracting ia plurality of features from the digitized signals; and using a logistic regression model to compute a probability of deception from the features.
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20. A method for automatically scoring by computer a polygraph test comprised of a plurality of relevant and control questions, the polygraph test generating a plurality of digitized physiological signals, the method comprising the steps of:
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transforming the digitized signals into a plurality of fundamental signals; standardizing the fundamental signals; extracting a plurality of features from the standardized fundamental signals at each question; using a plurality of logistic regression models to simultaneously compare the relevant questions to the control questions and combine the same feature from all questions to compute a score for each feature; and using a final logistic regression model to combine the scores of the features to produce a probability of deception.
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21. A method for automatically scoring a polygraph test comprised of a plurality of relevant and control questions, the polygraph test generating a plurality of digitized physiological signals, the method comprising the steps of:
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transforming the digitized signals into a plurality of fundamental signals; extracting a plurality of features from the fundamental signals at each question; standardizing the features for the relevant questions against the features for the control questions; determining a percentile value of each standardized relevant feature; and analyzing the percentile values to produce a probability of deception. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification