Selective attention increases the dependency of cortical responses on visual motion coherence in man |
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Authors: | Händel Barbara Lutzenberger Werner Thier Peter Haarmeier Thomas |
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Institution: | Department of General Neurology, University of Tübingen, 72076 Tübingen, Germany. |
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Abstract: | Attention improves visual discrimination and consequently allows to discern stimuli with low signal-to-noise ratios that otherwise would remain undetected. We used magnetoencephalography (MEG) to test whether neuromagnetic responses recorded from occipito-temporal cortex, reflecting the size of visual motion signals embedded in noise (motion coherence), would mirror the perceptual changes induced by attention. Attention directed to a given hemifield increased and decreased the coherence modulation of the MEG response over contralateral and ipsilateral visual cortex, respectively, indicating a change in the neuronal signal-to-noise ratio at the population level. |
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