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Memory-matches evoke human gamma-responses
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...
Autores principales: | , , , , |
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Formato: | Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2004
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC419345/ https://www.ncbi.nlm.nih.gov/pubmed/15084225 http://dx.doi.org/10.1186/1471-2202-5-13 |
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author | Herrmann, Christoph S Lenz, Daniel Junge, Stefanie Busch, Niko A Maess, Burkhard |
author_facet | Herrmann, Christoph S Lenz, Daniel Junge, Stefanie Busch, Niko A Maess, Burkhard |
author_sort | Herrmann, Christoph S |
collection | PubMed |
description | 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. |
format | Text |
id | pubmed-419345 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2004 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-4193452004-05-28 Memory-matches evoke human gamma-responses Herrmann, Christoph S Lenz, Daniel Junge, Stefanie Busch, Niko A Maess, Burkhard BMC Neurosci Research Article 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. BioMed Central 2004-04-13 /pmc/articles/PMC419345/ /pubmed/15084225 http://dx.doi.org/10.1186/1471-2202-5-13 Text en Copyright © 2004 Herrmann et al; licensee BioMed Central Ltd. This is an Open Access article: verbatim copying and redistribution of this article are permitted in all media for any purpose, provided this notice is preserved along with the article's original URL. |
spellingShingle | Research Article Herrmann, Christoph S Lenz, Daniel Junge, Stefanie Busch, Niko A Maess, Burkhard Memory-matches evoke human gamma-responses |
title | Memory-matches evoke human gamma-responses |
title_full | Memory-matches evoke human gamma-responses |
title_fullStr | Memory-matches evoke human gamma-responses |
title_full_unstemmed | Memory-matches evoke human gamma-responses |
title_short | Memory-matches evoke human gamma-responses |
title_sort | memory-matches evoke human gamma-responses |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC419345/ https://www.ncbi.nlm.nih.gov/pubmed/15084225 http://dx.doi.org/10.1186/1471-2202-5-13 |
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