Abstract
Despite advances in neuroimaging, the physiological basis of abnormal human perceptions, such as hallucinations, has remained elusive. Electrophysiological studies in animals suggest that synchronous high-frequency cortical oscillations (40 Hz or γ-band electroencephalogram [EEG]) may reflect the process of perception. 1 Gray CM König P Engel A Singer W Oscillatory responses in cat visual cortex exhibit inter-columnar synchronization which reflects global stimulus properties. Nature. 1989; 338: 334-337 Crossref PubMed Scopus (2950) Google Scholar Analogous oscillations in the human EEG are generally of low voltage and are, therefore, difficult to distinguish.
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