The P300 component of the Event-Related Potential has been shown to be a useful tool in the detection of simulated amnesia, which represents one type of pseudomemory phenomenon. Another such phenomenon is false recognition. Possible effects of simulated amnesia and false recognition on P300 amplitude and topography were investigated in a series of three experiments. Two experiments used an autobiographical oddball paradigm, assessing possible effects of feigning amnesia both between-groups and within-individuals. In Experiment 1, the feigning of amnesia reduced oddball P300 amplitudes relative to amplitudes associated with honest recognition of autobiographical items, both between-groups (honest and feigning) and within a single group of participants instructed to perform honestly during one of two sub-tests, and to feign amnesia during the second. 93% of amnesia simulators were still identified as having intact recognition memory. The feigning of amnesia also altered P300 topography relative to honest performance, between-groups and within the feigning group. Experiment 2 investigated the utility of the same P300-enhanced simulated amnesia detection paradigm in a population exhibiting personality characteristics considered central to psychopathy. 100% of Low and 92% of High qPsychopathyq amnesia simulators were correctly identified as having intact recognition memory. Feigning-related P300 amplitude reductions were observed, most notably in the High qPsychopathyq group. While feigning amnesia also altered P300 topography relative to honest recognition across groups, no topographical differences were seen between Low and High qPsychopathyq groups. In Experiment 3, P300 was recorded in a modification of the Roediger a McDermott (1995) paradigm. P300 amplitudes and topographies were evaluated in true recognition of previously presented (Old) words and in false recognition of associatively related, never presented (Lure) words. While P300 topographies and amplitudes differed between recognized and rejected items of both types (Old vs. New words, falsely recognized Lures vs. correctly rejected Lures), P300 did not differ significantly in either amplitude or topography between true and false recognition. However, false recognition of Lures produced substantially shorter P300 latencies than did the true recognition of Old words. These studies show that P300 may be useful in investigating two specific types of pseudomemory phenomena, simulated amnesia and false recognition.The P300 component of the Event-Related Potential has been shown to be a useful tool in the detection of simulated amnesia, which represents one type of pseudomemory phenomenon. Another such phenomenon is false recognition.
|Title||:||P300 Amplification and Topography in Pseudomemory Phenomena|
|Author||:||Antoinette Reinhart Miller|