Induced EEG gamma band response to familiar and unfamiliar objects as a manifestation of saccades
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1
Department of Psychology, The Hebrew University of Jerusalem, Israel
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2
Interdisciplinary Center for Neural Computation, The Hebrew University of Jerusalem, Israel
Numerous intracranial findings in humans and animals show that neural activity in the gamma-band is crucial for brain function and has a central role in the cognitive system. In humans, the typical induced gamma response (iGBR) shown in scalp recorded EEG is a broad-band response with a relatively short duration, maximal at around 200-300 ms post stimulus onset, and broadly distributed at parieto-occipital channels. We showed in a recent paper (Yuval-Greenberg et al., 2008) that at the single trial level, this iGBR coincides with the onset of involuntary miniature eye movements and reflects a saccadic “spike potential”. Thus, whereas neuronal gamma-band oscillations were shown conclusively with other methods, this particular broadband transient iGBR recorded by scalp EEG reflects properties of saccade dynamics rather than neuronal oscillations. We also suggested that the effects of cognitive manipulations on this iGBR could be due to changes in saccade characteristics. Here, we examine again this relationship between eye movements and the iGBR using simultaneous EEG and eye movements recordings, with a paradigm that was consistently shown in the past to affect the iGBR. Color drawings of daily objects were presented either in their original form (familiar) or in a distorted form which could not be recognized (unfamiliar). The effect of stimulus size was also examined. Eight subjects were tested, and as previously reported, the iGBR was affected by familiarity. However, congruent with our previous results, we show that the iGBR for both familiar and unfamiliar objects is fully explained by presence of saccades. The correlation between the two measures is high and when only trials with no saccades at the relevant window are selected, the iGBR is eliminated (see figure). We will discuss the familiarity effect in light of the correlations between the iGBR and saccade characteristics.
References
1. Yuval-Greenberg, S. Tomer, O., Keren, A., Nelken I., Deouell, L.Y. (2008) Transient Induced Gamma-Band Response in EEG as a Manifestation of Miniature Saccades, Neuron 58, 429–441.
Conference:
10th International Conference on Cognitive Neuroscience, Bodrum, Türkiye, 1 Sep - 5 Sep, 2008.
Presentation Type:
Oral Presentation
Topic:
Brain Electrical Oscillations in Cognition
Citation:
Yuval-Greenberg
S and
Deouell
L
(2008). Induced EEG gamma band response to familiar and unfamiliar objects as a manifestation of saccades.
Conference Abstract:
10th International Conference on Cognitive Neuroscience.
doi: 10.3389/conf.neuro.09.2009.01.115
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Received:
03 Dec 2008;
Published Online:
03 Dec 2008.
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Correspondence:
Shlomit Yuval-Greenberg, Department of Psychology, The Hebrew University of Jerusalem, Jerusalem, Israel, shlomit.greenberg@mail.huji.ac.il