Polygraph automated scoring systems
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United States of America Patent
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Jul 12, 1994
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N/A
app pub date -
Jan 22, 1993
filing date -
Jan 22, 1993
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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.
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