S-Space College of Medicine/School of Medicine (의과대학/대학원) Dept. of Neurology (신경과학교실) Journal Papers (저널논문_신경과학교실)
Influence of task difficulty on the features of event-related potential during visual oddball task
- Kim, Kyung Hwan; Kim, Ja Hyun; Yoon, Jin; Jung, Ki-Young
- Issue Date
- Neuroscience Letters, Vol.445 No.2, pp. 179-183
- 공학; Event-related potential (ERP); Visual oddball task; Task difficulty; P300; P2; Single-trial ERP; Independent component analysis (ICA)
- 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.
- Files in This Item: There are no files associated with this item.