| |
Abstract:
Previous event-related potential (ERP) studies of deception
have manipulated recollection of past events (real or experimental)
to isolate waveforms associated with deceptive responding.
Unfortunately, previous guilty knowledge studies confounded
memory-related and deception-related tasks. The current experiment
utilized a paradigm that did not involve a recall task.
Participants (n=16) were asked to view series of questions that
were obviously true or false (for example, I am human). These
questions were followed by a second stimulus (TRUE or FALSE) to
which the participants responded by agreeing or disagreeing (for
example, I am human followed by FALSE, response = disagree).
Sentences were presented in either the red or blue. Participants
were randomly cued by sentence color to respond truthfully or
deceptively. The individual participant ERPs for all conditions
were recorded from 128 electrode sites using a high-density sensor
net (Electrical Geodesics, Inc.), and then submitted to a temporal
Principal Components Analysis (PCA). Six principal components
accounted for a substantial proportion of the variance. For
retained principal components, individual factor scores were
submitted to a one-way repeated measures ANOVA testing deceptive
vs. truthful conditions. Two components were affected by the
experimental manipulation. An early positive component was largest
to deceptive sentences (F[1,15]=5.99, p<.027). A subsequent
frontal negativity also showed near-significant deception related
effects (F[1,15]=4.00, p<.064). These data suggest that specific
components are associated with deception.
|
