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BMC Neurosci. 2004 Apr 13;5:13.

Memory-matches evoke human gamma-responses.

Author information

1
Otto-von-Guericke University, Dept of Biological Psychology, PO Box 4120, 39016 Magdeburg, Germany. christoph.herrmann@nat.uni-magdeburg.de

Abstract

BACKGROUND:

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.

RESULTS:

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.

CONCLUSIONS:

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.

PMID:
15084225
PMCID:
PMC419345
DOI:
10.1186/1471-2202-5-13
[Indexed for MEDLINE]
Free PMC Article

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