title: Feedback modulates gamma oscillations in a hypothesis testing paradigm.
abstract: We analyzed the time-varying modulation of gamma (>30 Hz) electroencephalographic (EEG) activity exerted by positive and negative feedback in a hypothesis testing paradigm. Ten college students serially tested hypotheses concerning a hidden rule by judging its presence or absence in triplets of digits and revised them on the basis of an exogenous performance feedback. The EEG signal was convolved with a family of complex wavelets and brain potentials were extracted in the gamma range. Feedback-related modulations were found as early as 100 ms after feedback onset, as well as in the 300-600 ms time-window. The results were discussed in terms of functional and neurophysiological models of feedback.
authors.affiliation: Laboratoire de Psychologie Cognitive, CNRS UMR 6146, Case 66, Université de Provence, Place V. Hugo 13331 Marseille Cedex 3, France. papoda@post.tau.ac.il
authors.forename: David
authors.initials: D
authors.lastname: Papo
authors.forename: Abdel
authors.initials: A
authors.lastname: Douiri
authors.forename: Florence
authors.initials: F
authors.lastname: Bouchet
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Bourzeix
authors.forename: Jean-Paul
authors.initials: JP
authors.lastname: Caverni
authors.forename: Pierre-Marie
authors.initials: PM
authors.lastname: Baudonnière
mesh_terms: D000328:Adult; D001683:Biological Clocks / Q000502:physiology*; D001921:Brain / Q000502:physiology*; D001931:Brain Mapping; D004569:Electroencephalography; D005071:Evoked Potentials / Q000502:physiology*; D005246:Feedback / Q000502:physiology*; D005260:Female; D006801:Humans; D007600:Judgment / Q000502:physiology; D008297:Male; D010775:Photic Stimulation / Q000379:methods; D011930:Reaction Time / Q000502:physiology; D013997:Time Factors