Prestimulus oscillatory activity in the alpha band predicts visual discrimination ability
| Autor: | Jan-Mathijs Schoffelen, Hanneke van Dijk, Robert Oostenveld, Ole Jensen |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Adult
Male Visual perception genetic structures 160 002 Oscillatory activity in sensory and motor processing Brain activity and meditation media_common.quotation_subject Biophysics Poison control Electroencephalography Developmental psychology Discrimination Learning 03 medical and health sciences 0302 clinical medicine Rhythm Biological Clocks medicine Reaction Time Humans GeneralLiterature_REFERENCE(e.g. dictionaries encyclopedias glossaries) 030304 developmental biology media_common 0303 health sciences medicine.diagnostic_test Resting state fMRI General Neuroscience 120 000 Neuronal Coherence Magnetoencephalography 160 000 Neuronal Oscillations Articles Alpha Rhythm Visual Perception Female 120 004 Integrating distributed brain processes Psychology Neuroscience 030217 neurology & neurosurgery Photic Stimulation Psychomotor Performance Vigilance (psychology) Forecasting |
| Zdroj: | The Journal of Neuroscience, 28MEG, 8, pp. 1816-1823 The Journal of Neuroscience, 28MEG, 1816-1823 |
| ISSN: | 0270-6474 |
| Popis: | Although the resting and baseline states of the human electroencephalogram and magnetoencephalogram (MEG) are dominated by oscillations in the alpha band (∼10 Hz), the functional role of these oscillations remains unclear. In this study we used MEG to investigate how spontaneous oscillations in humans presented before visual stimuli modulate visual perception. Subjects had to report if there was a subtle difference in gray levels between two superimposed presented discs. We then compared the prestimulus brain activity for correctly (hits) versus incorrectly (misses) identified stimuli. We found that visual discrimination ability decreased with an increase in prestimulus alpha power. Given that reaction times did not vary systematically with prestimulus alpha power changes in vigilance are not likely to explain the change in discrimination ability. Source reconstruction using spatial filters allowed us to identify the brain areas accounting for this effect. The dominant sources modulating visual perception were localized around the parieto-occipital sulcus. We suggest that the parieto-occipital alpha power reflects functional inhibition imposed by higher level areas, which serves to modulate the gain of the visual stream. |
| Databáze: | OpenAIRE |
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