Memory-matches evoke human gamma-responses
<p>Abstract</p> <p>Background</p> <p>Human brain activity in the gamma frequency range has been shown to be a correlate of numerous cognitive functions like attention, perception and memory access. More specifically, gamma activity has been found to be enhanced when sti...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
BMC
2004-04-01
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| Series: | BMC Neuroscience |
| Online Access: | http://www.biomedcentral.com/1471-2202/5/13 |
| Summary: | <p>Abstract</p> <p>Background</p> <p>Human brain activity in the gamma frequency range has been shown to be a correlate of numerous cognitive functions like attention, perception and memory access. More specifically, gamma activity has been found to be enhanced when stimuli are stored in or match with short-term memory (STM). We tested the hypothesis that gamma activity is also evoked when stimuli match representations in long-term-memory (LTM). EEG was recorded from 13 subjects performing a choice reaction task. Visual stimuli were either known real-world objects with a memory representation or novel configurations never seen before.</p> <p>Results</p> <p>All stimuli evoked an early gamma response which was maximal over occipital electrodes. This evoked gamma activity was significantly larger for items that matched memory templates.</p> <p>Conclusions</p> <p>Therefore, we argue that gamma activity results from the feedback from memory into perception systems. This assumption seems to be true for STM as well as LTM.</p> |
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| ISSN: | 1471-2202 |