Visual Cortical Gamma-Band Activity During Free Viewing of Natural Images
| Autor: | Mark Roberts, Peter De Weerd, Robert Oostenveld, Pascal Fries, Conrado A. Bosman, Nicolas M. Brunet, Thilo Womelsdorf |
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| Přispěvatelé: | Cognitive and Systems Neuroscience (SILS, FNWI), Cognitive Neuroscience, RS: FPN CN 3 |
| Rok vydání: | 2013 |
| Předmět: |
Male
Visual perception Photic Stimulation Cognitive Neuroscience Biophysics 150 000 MR Techniques in Brain Function Lateralization of brain function 03 medical and health sciences Cellular and Molecular Neuroscience 0302 clinical medicine Cortex (anatomy) free viewing Gamma Rhythm Saccades medicine Animals Premovement neuronal activity 120 003 Role of neuronal synchrony in multi-modal integration Electrocorticography Visual Cortex 030304 developmental biology 0303 health sciences medicine.diagnostic_test 120 000 Neuronal Coherence Articles oscillation ECoG Electrodes Implanted Visual cortex medicine.anatomical_structure natural image Visual Perception Macaca gamma Psychology Neuroscience 120 013 Primate Research Maastricht 030217 neurology & neurosurgery |
| Zdroj: | Cerebral Cortex (New York, NY) Cerebral Cortex, 25, 918-926 Cerebral Cortex, 25, 4, pp. 918-926 Cerebral Cortex Cerebral Cortex, 25(4), 918-926. Oxford University Press |
| ISSN: | 1460-2199 1047-3211 |
| DOI: | 10.1093/cercor/bht280 |
| Popis: | Gamma-band activity in visual cortex has been implicated in several cognitive operations, like perceptual grouping and attentional selection. So far, it has been studied primarily under well-controlled visual fixation conditions and using well-controlled stimuli, like isolated bars or patches of grating. If gamma-band activity is to subserve its purported functions outside of the laboratory, it should be present during natural viewing conditions. We recorded neuronal activity with a 252-channel electrocorticographic (ECoG) grid covering large parts of the left hemisphere of 2 macaque monkeys, while they freely viewed natural images. We found that natural viewing led to pronounced gamma-band activity in the visual cortex. In area V1, gamma-band activity during natural viewing showed a clear spectral peak indicative of oscillatory activity between 50 and 80 Hz and was highly significant for each of 65 natural images. Across the ECoG grid, gamma-band activity during natural viewing was present over most of the recorded visual cortex and absent over most remaining cortex. After saccades, the gamma peak frequency slid down to 30-40 Hz at around 80 ms postsaccade, after which the sustained 50- to 80-Hz gamma-band activity resumed. We propose that gamma-band activity plays an important role during natural viewing. |
| Databáze: | OpenAIRE |
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