The N2 component of the event-related brain potential in abstinent alcoholics.
paper
Cited
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- Authors
- Porjesz, B; Begleiter, H; Bihari, B; Kissin, B
- Year
- 1987
- Journal
- Electroencephalography and clinical neurophysiology
- PMID
- 2431876
- DOI
- 10.1016/0013-4694(87)90181-7
The latencies of the N2 component of the ERP and reaction time were manipulated in abstinent alcoholics and controls. The experimental design consisted of visual stimuli that differed in difficulty of discrimination. N2 latencies were found to be significantly delayed in alcoholics compared to controls, particularly for the easy discrimination. While controls manifested significantly earlier N2 latencies for the easy discrimination compared to the difficult discrimination, alcoholics did not manifest any significant difference in the latency of N2 as a function of the level of difficulty. There were no significant differences between groups in terms of RT or number of errors. In addition, alcoholics displayed significantly reduced P3 amplitudes to target stimuli compared to controls. These results suggest that match/mismatch processes are impaired in alcoholics and that they have difficulty evaluating the potential significance of a stimulus.
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