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An early transient 40 Hz activity discriminates a following pro-saccade from a no-move and anti-saccade choice

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An early transient 40 Hz activity discriminates a following pro-saccade from a no-move and anti-saccade choice (EN)
Evdokimidis, I (EN)
Constantinidis, TS (EN)
Stefanis, CN (EN)
Smyrnis, N (EN)
Linardatos, D (EN)
journalArticle (EN)
2014-03-01T01:51:01Z
2001 (EN)
We studied the oscillatory activity of the scalp-recorded EEG in healthy humans performing a task that required a particular eye-movement response choice according to the shape of a visual target. We observed a significant stimulus-aligned activity at the 40 Hz frequency band 100 ms after the appearance of the target only when that target was the end point for the subsequent eye movement (pro-saccade). This activity was most prominent over the central-parietal area of the right hemisphere. When the target indicated a movement to the opposite direction (anti-saccade) or indicated that no movement was required (no-move), this 40 Hz activity was nearly absent. This difference in activity between the pro-saccade and the other two tasks was evident in the single subject ERPs for four of the six subjects studied. In contrast, the movement-aligned 40 Hz activity for the pro-saccade and anti-saccade was almost identical. We speculate that this early stimulus-aligned 40 Hz activity might reflect a fast transformation of a visual stimulus to a motor response (eye movement) that can be performed for the pro-saccade task where stimulus-response compatibility is strong compared to the antisaccade and no-move tasks. The movement-aligned 40 Hz activity might be related to the motor response preparation per se. We conclude that this task specific transient oscillatory activity could be used as a probe in the study of the temporal dynamics of visuomotor transformations. (EN)
Neurosciences (EN)
oculomotor task (EN)
TASK (EN)
EYE-MOVEMENT (EN)
HUMANS (EN)
NEURONAL OSCILLATIONS (EN)
visual discrimination (EN)
RESPONSES (EN)
PERCEPTION (EN)
gamma-band response (EN)
POSTERIOR PARIETAL CORTEX (EN)
GO/NOGO (EN)
CAT VISUAL-CORTEX (EN)
CORTICAL POTENTIALS (EN)
oscillatory EEG activity (EN)
GAMMA-BAND ACTIVITY (EN)
anti-saccade (EN)
visuomotor transformation (EN)
EXPERIMENTAL BRAIN RESEARCH (EN)
English
SPRINGER-VERLAG (EN)
National Technical University of Athens
Digital Library of National Technical University of Athens | Dspace@NTUA
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