Task relevance and recognition of concealed information have different influences on electrodermal activity and event-related brain potentials.
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Task relevance and recognition of concealed information have different influences on electrodermal activity and event-related brain potentials. / Gamer, Matthias; Berti, Stefan.
In: PSYCHOPHYSIOLOGY, 2009.Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review
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TY - JOUR
T1 - Task relevance and recognition of concealed information have different influences on electrodermal activity and event-related brain potentials.
AU - Gamer, Matthias
AU - Berti, Stefan
PY - 2009
Y1 - 2009
N2 - Abstract This study aimed at differentiating between memory- and task-related processes and their correlates on the electrodermal and electrocortical level during information concealment. Variations of the Guilty Knowledge Test were implemented in two experiments while we measured skin conductance responses (SCRs) and event-related brain potentials. P300 amplitudes were specifically enhanced for items requiring a deviant behavioral response but they were not sensitive to concealed knowledge. In contrast, N200 amplitudes differed between memorized and irrelevant items in both experiments. SCR measures reflected a combined influence of task relevance and probe recognition, and they provided incremental validity above N200 amplitudes. These results suggest that the P300 mainly reflects task relevance in the given experimental setting whereas the N200 amplitude is sensitive to previously encoded information and potentially linked to response monitoring processes.
AB - Abstract This study aimed at differentiating between memory- and task-related processes and their correlates on the electrodermal and electrocortical level during information concealment. Variations of the Guilty Knowledge Test were implemented in two experiments while we measured skin conductance responses (SCRs) and event-related brain potentials. P300 amplitudes were specifically enhanced for items requiring a deviant behavioral response but they were not sensitive to concealed knowledge. In contrast, N200 amplitudes differed between memorized and irrelevant items in both experiments. SCR measures reflected a combined influence of task relevance and probe recognition, and they provided incremental validity above N200 amplitudes. These results suggest that the P300 mainly reflects task relevance in the given experimental setting whereas the N200 amplitude is sensitive to previously encoded information and potentially linked to response monitoring processes.
M3 - SCORING: Zeitschriftenaufsatz
JO - PSYCHOPHYSIOLOGY
JF - PSYCHOPHYSIOLOGY
SN - 0048-5772
ER -
