Induced visual illusions and gamma oscillations in human primary visual cortex

The European Journal of Neuroscience
Peyman AdjamianKrish D Singh

Abstract

Using magnetoencephalography, we studied the spatiotemporal properties of cortical responses in terms of event-related synchronization and event-related desynchronization to a range of stripe patterns in subjects with no neurological disorders. These stripes are known for their tendency to induce a range of abnormal sensations, such as illusions, nausea, dizziness, headache and attacks of pattern-sensitive epilepsy. The optimal stimulus must have specific physical properties, and maximum abnormalities occur at specific spatial frequency and contrast. Despite individual differences in the severity of discomfort experienced, psychophysical studies have shown that most observers experience some degree of visual anomaly on viewing such patterns. In a separate experiment, subjects reported the incidence of illusions and discomfort to each pattern. We found maximal cortical power in the gamma range (30-60 Hz) confined to the region of the primary visual cortex in response to patterns of 2-4 cycles per degree, peaking at 3 cycles per degree. This coincides with the peak of mean illusions and discomfort, also maximal for patterns of 2-4 cycles per degree. We show that gamma band activity in V1 is a narrow band function of spatial frequ...Continue Reading

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Citations

Jul 14, 2012·Journal of the Association for Research in Otolaryngology : JARO·Peyman AdjamianAlan R Palmer
May 3, 2005·NeuroImage·Stephen D HallGareth R Barnes
May 7, 2009·Proceedings of the National Academy of Sciences of the United States of America·Suresh D MuthukumaraswamyKrish D Singh
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