Financial incentive does not affect P300 (in response to certain episodic and semantic probe stimuli) in the Complex Trial Protocol (CTP) version of the Concealed Information Test (CIT) in detection of malingering.
Previous research indicated that the skin conductance response of the autonomic nervous system in the Concealed Information Test (CIT) is typically increased in subjects who are financially and otherwise incentivized to defeat the CIT (the paradoxical "motivational impairment" effect). This is not the case for RT-based CITs, nor P300 tests based on the three-stimulus protocol for detection of cognitive malingering (although these are not the same as CITs). The present report is the first attempt to study the effect of financial motivation on the P300-based Complex Trial Protocol using both episodic and semantic memory probe and irrelevant stimuli. The Test of Memory Malingering (TOMM) was used to validate behavioral differences between the two groups we created by offering one (paid) group but not another (unpaid) group a financial reward for beating our tests. Group behavioral differences on the TOMM did confirm group manipulations. Probe-minus-irrelevant P300 differences did not differ between groups, although as previously, semantic memory-evoked P300s were larger than episodic memory-evoked P300s.
Department of Psychology, Northwestern University, Evanston, Illinois, USA.
J Peter
JP
Rosenfeld
Department of Psychology, Northwestern University, Evanston, Illinois, USA.
Elena
E
Labkovsky
Department of Psychology, Northwestern University, Evanston, Illinois, USA.
Elena
E
Davydova
Department of Psychology, Northwestern University, Evanston, Illinois, USA.
Anne
A
Ward
Department of Psychology, Northwestern University, Evanston, Illinois, USA.
Lauren
L
Rosenfeld
D000293:Adolescent; D000328:Adult; D002540:Cerebral Cortex / Q000502:physiology*; D008192:Deception; D018913:Event-Related Potentials, P300; D005260:Female; D006801:Humans; D008297:Male; D008568:Memory / Q000502:physiology*; D061212:Memory, Episodic; D009042:Motivation / Q000502:physiology*; D009483:Neuropsychological Tests; D011930:Reaction Time; D012201:Reward; D012660:Semantics; D055815:Young Adult
Complex Trial Protocol; Incentive; Motivation; P300 CIT