Effect of the Orientation Difference on Components of Visual Event-Related Potentials
Changes in the components of visual event-related potentials (VERPs) depending on the difficulty of the identification counting tasks (“coarse” and “fine”) were studied in healthy humans. The basic finding is that much greater changes in the VERPs waves were observed within a 5 to 15 deg range th...
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| Datum: | 2013 |
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| Hauptverfasser: | , |
| Format: | Artikel |
| Sprache: | English |
| Veröffentlicht: |
Інститут фізіології ім. О.О. Богомольця НАН України
2013
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| Schriftenreihe: | Нейрофизиология |
| Online Zugang: | http://dspace.nbuv.gov.ua/handle/123456789/148099 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Effect of the Orientation Difference on Components of Visual Event-Related Potentials / J. Dushanova, D. Mitov // Нейрофизиология. — 2013. — Т. 45, № 3. — С. 273-278. — Бібліогр.: 20 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| Zusammenfassung: | Changes in the components of visual event-related potentials (VERPs) depending on the
difficulty of the identification counting tasks (“coarse” and “fine”) were studied in healthy
humans. The basic finding is that much greater changes in the VERPs waves were observed
within a 5 to 15 deg range than those within the range of 15 to 90 deg. The amplitude of the
second sensory component (P2), the latencies of both sensory components, and that of the
second cognitive one increased with increase in the task difficulty, while the amplitudes of
both cognitive components N2/P3 decreased. Additionally, small changes in the task difficulty
affected the attentional effort and modulated the N1 amplitude and P2 latency. These VERP
changes are considered an electrophysiological correlate of the psychophysical data when the
“label” of an activated orientation-selective channel is sufficient for “coarse” discrimination,
and an additional computational process comparing the responses of the activated channels
makes discrimination possible in “fine” discrimination. |
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