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Influence of task difficulty on the features of event-related potential during visual oddball task

Cited 43 time in Web of Science Cited 51 time in Scopus
Authors
Kim, Kyung Hwan; Kim, Ja Hyun; Yoon, Jin; Jung, Ki-Young
Issue Date
2008-11
Publisher
Elsevier
Citation
Neuroscience Letters, Vol.445 No.2, pp. 179-183
Keywords
공학Event-related potential (ERP)Visual oddball taskTask difficultyP300P2Single-trial ERPIndependent component analysis (ICA)
Abstract
We present a comprehensive analysis of the change in event-related potential (ERP) due to task difficulty during a visual oddball task. Specifically, we investigated the inter-subject difference in difficulty-related change of ERP patterns using single-trial ERP analysis focusing on P300 and P2 components. ERPs were recorded and analyzed from 14 subjects while performing a visual oddball task with two difficulty levels. After extracting independent components (ICs) front single-trial ERPs, the averaged ERPs were used to identify which lCs originated from major ERP components. The ERP components were estimated from single-trial waveforms by back-projecting relevant ICs onto scalp electrodes after removing all other ICs; thus, the comparison of ERP components could be performed for each subject. The averaged P300 amplitude was smaller and latency was larger for the more difficult task, and this tendency was also observed for single-trial ERP analysis within each subject. P2 amplitude increased for the hard task for both group and individual analyses, suggesting that the P2 may be interpreted as a manifestation of task relevance evaluation or response generation. The P2 amplitude and latency were more notably correlated with response time for the more difficult task.
ISSN
0304-3940
Language
English
URI
https://hdl.handle.net/10371/91782
DOI
https://doi.org/10.1016/j.neulet.2008.09.004
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College of Medicine/School of Medicine (의과대학/대학원)Dept. of Neurology (신경과학교실)Journal Papers (저널논문_신경과학교실)
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