Sharpening and formation of cortical object representations – EEG gamma band results revisited
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1
University of Osnabrueck, Germany
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2
Cuban Neuroscience Center, Cuba
It was suggested that induced gamma band responses (iGBRs) in the human electroencephalogram (EEG) are related to the activation of cortical networks encoding object representations. More specifically, it was shown that iGBRs are sensitive to a) the familiarity of presented stimuli and b) the repetition of such stimuli. Whereas repeated presentations of familiar objects lead to a decrease in iGBR amplitude, the opposite was observed for unfamiliar stimuli. The first effect has been interpreted as “sharpening” of an object representation, whereas the later has been seen as a correlate of the “formation” of a new object representation. However, these findings have to be seen with caution, as it was also shown that miniature saccades (MS) during fixation lead to high frequency artifacts that interfere with the cortical iGBR. In the present experiment EEG and eye movements were recorded simultaneously while subjects performed an object recognition task. Results show that iGBRs remain sensitive to both stimulus familiarity and repetition after MS-related artifacts were suppressed. Therefore, we conclude that iGBRs indeed reflect the activity of cortical networks representing objects and memory-related dynamics within these networks. Additionally, eye movement data was utilized to validate the implemented suppression of spike potentials elicited by MS.
Keywords:
EEG,
memory and learning
Conference:
XI International Conference on Cognitive Neuroscience (ICON XI), Palma, Mallorca, Spain, 25 Sep - 29 Sep, 2011.
Presentation Type:
Poster Presentation
Topic:
Poster Sessions: Neural Bases of Memory and Learning
Citation:
Hassler
U,
Trujillo-Barreto
N and
Gruber
T
(2011). Sharpening and formation of cortical object representations – EEG gamma band results revisited.
Conference Abstract:
XI International Conference on Cognitive Neuroscience (ICON XI).
doi: 10.3389/conf.fnhum.2011.207.00217
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Received:
21 Nov 2011;
Published Online:
28 Nov 2011.
*
Correspondence:
Dr. Uwe Hassler, University of Osnabrueck, Osnabrueck, Germany, uhassler@uos.de