Visual stimulation elicits locked and induced gamma oscillations in monkey intracortical- and EEG-potentials, but not in human EEG.
作者： Egbert Juergens , Andreas Guettler , R. Eckhorn
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摘要: Stimulus-related fast oscillations in the γ-range (30–100 Hz) were clearly demonstrated with microelectrode recordings visual cortex of awake monkeys, and they also reported for human electroencephalograms (EEG). However, presence stimulus-related γ-modulation EEG has repeatedly been disputed. To clarify this dispute, we recorded scalp man monkey as well intracortical field potentials (LFP) from primary (V1) during identical stimulation (large-field sinusoidal gratings, which proved to induce largest γ-amplitudes V1 V2). We found a strong increase γ-oscillations LFP EEG, but no modulation γ-activity EEG. In contrast previous results, strongly phase-locked stimulus onsets early response periods (80–160 ms) became gradually independent later periods. Our negative result on subjects contradicts several published findings. conclude our results that visually evoked γ-modulations humans are not accessible monkey.
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