Induced gamma band responses predict recognition delays during object identification

Jasna Martinovic, Thomas Gruber, Matthias M. Mueller

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Abstract

Neural mechanisms of object recognition seem to rely on activity of distributed neural assemblies coordinated by synchronous firing in the gamma-band range (>20 Hz). In the present electroencephalogram (EEG) study, We investigated induced gamma hand, activity during the naming of line drawings Of Uptight objects and objects rotated in the image plane. Such plane-rotation paradigms elicit view-dependent processing, leading to delays in recognition of disoriented objects. Our behavioral results Showed reaction time delays for rotated, as opposed to upright, images. These delays were accompanied by delays in the peak latency of induced gamma band responses (GBRs), in the absence of any effects on other measures of EEG activity. The latency of the induced GBRs has thus, for the first time, been selectively Modulated by an experimental manipulation that delayed recognition. This finding indicates that induced GBRs have a genuine role as neural markers of late representational processes during object recognition. In concordance with the view that object recognition is achieved through dynamic learning processes, we propose that induced gamma band activity could be one of the possible cortical markers of such dynamic object coding.

Original languageEnglish
Pages (from-to)921-934
Number of pages14
JournalJournal of Cognitive Neuroscience
Volume19
Issue number6
Early online date30 May 2007
DOIs
Publication statusPublished - Jun 2007

Keywords

  • oscillatory brain activity
  • repetition priming task
  • top-down facilitation
  • human eeg
  • rotated objects
  • mental rotation
  • evoked-potentials
  • time-course
  • orientation
  • cortex

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