A prefrontal ERP involved in decision making during visual duration and size discrimination tasks.
Recently, a late positive component (LPCt) with prefrontal dominance was identified in a duration discrimination task as a marker of decision-making processes (Paul et al., 2003). In the present study, LPCt amplitudes and latencies were measured in visual and size discrimination tasks for the purpose of determining the selectivity of this phenomenon. LPCt amplitudes were larger and latencies shorter for longer stimulus pairs, at a time of maximal behavioral performances. Wave amplitudes were also larger for smaller stimuli, but were not directly related to behavioral performances. These results indicate that the LPCt is not specific to temporal discrimination but can reflect more general decision-making processes.
Université de Rouen, Faculté des Sciences, Laboratoire de Psychologie et Neurosciences de la Cognition (EA1780), Mont-Saint-Aignan Rouen Cedex, France.
Emilie
E
Gontier
Christophe
C
Le Dantec
Isabelle
I
Paul
Christian
C
Bernard
Robert
R
Lalonde
Mohamed
M
Rebaï
D000328:Adult; D000704:Analysis of Variance; D003657:Decision Making / Q000502:physiology*; D004192:Discrimination, Psychological / Q000502:physiology*; D005074:Evoked Potentials, Visual / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D017397:Prefrontal Cortex / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology; D012016:Reference Values; D012858:Size Perception / Q000502:physiology; D013998:Time Perception / Q000502:physiology*