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Interactions between working memory and visual perception: An ERP/EEG study (2007)
| Venue: | Neuroimage |
| Citations: | 11 - 7 self |
BibTeX
@ARTICLE{Agam07interactionsbetween,
author = {Yigal Agam and Robert Sekuler},
title = {Interactions between working memory and visual perception: An ERP/EEG study},
journal = {Neuroimage},
year = {2007},
volume = {36},
pages = {933--942}
}
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Abstract
How do working memory and perception interact with each other? Recent theories of working memory suggest that they are closely linked, and in fact share certain brain mechanisms. We used a sequential motion imitation task in combination with EEG and ERP techniques for a direct, online examination of memory load's influence on the processing of visual stimuli. Using a paradigm in which subjects tried to reproduce random motion sequences from memory, we found a systematic decrease in ERP amplitude with each additional motion segment that was viewed and memorized for later imitation. Highfrequency (N20 Hz) oscillatory activity exhibited a similar positiondependent decrease. When trials were sorted according to the accuracy of subsequent imitation, the amplitude of the ERPs during stimulus presentation correlated with behavioral performance: the larger the amplitude, the more accurate the subsequent imitation. These findings imply that visual processing of sequential stimuli is not uniform. Rather, earlier information elicits stronger neural activity. We discuss possible explanations for this observation, among them competition for attention between memory and perception and encoding of serial order by means of differential activation strengths. © 2007 Elsevier Inc. All rights reserved.
Keyphrases
erp eeg study visual perception subsequent imitation additional motion segment sequential stimulus neural activity recent theory perception interact serial order systematic decrease stimulus presentation possible explanation elsevier inc visual stimulus memory load behavioral performance erp amplitude differential activation strength n20 hz oscillatory activity visual processing online examination information elicits random motion sequence erp technique fact share certain brain mechanism similar positiondependent decrease sequential motion imitation task
