P300 correlates of simulated malingered amnesia in a matching-to-sample task: topographic analyses of deception versus truthtelling responses.
Two experiments using a P300-enhanced Forced Choice Procedure (P3FCP) investigated simulated amnesia in a matching-to-sample task. In Experiment 1, successful manipulation of subjects towards different behavioral hit rates (75-80% vs. 85-90%) did not adversely affect the diagnostic sensitivity of match-mismatch Pz-P300 amplitude analyses, allowing detection of 69% of simulators. P300 amplitudes of simulators (Malinger group) were as large as those of truth-tellers (truth group, a control), indicating no dual task-related (Malingering) reduction across different behavioral hit rates. Experiment 2 found no main effect of oddball type, match vs. mismatch, on P300 (P3) amplitude with a mismatch-rare variant of the P3FCP. This study also revealed larger Pz-P3s in the Malingering (vs. Truth-telling) condition. Subsequent topographic analyses suggested different Truth and Malinger scaled P3 amplitude topographies in both these sets of P3FCP data and in those from a previous autobiographical memory paradigm. Further analysis yielded preliminary evidence for a common deception-related P3 amplitude topography across different paradigms/conditions.
Rosenfeld
J P
JP
Department of Psychology, Northwestern University, Evanston, IL 60208-2710, USA.
Reinhart
A M
AM
Bhatt
M
M
Ellwanger
J
J
Gora
K
K
Sekera
M
M
Sweet
J
J
D000328:Adult; D000647:Amnesia / Q000503:physiopathology* / Q000523:psychology*; D001519:Behavior / Q000502:physiology; D018913:Event-Related Potentials, P300 / Q000502:physiology*; D006801:Humans; D008014:Lie Detection / Q000523:psychology*; D008306:Malingering / Q000175:diagnosis* / Q000503:physiopathology; D012535:Scalp / Q000033:anatomy & histology