The role of the left temporal region under the cognitive motor demands of shooting in skilled marksmen

A number of investigators have reported elevated left temporal alpha power in marksmen during response preparation. This finding has been interpreted to indicate the suppression of irrelevant cognitive processes. However. low er-order motor processes have not been excluded as a possible explanation. Event-related alpha power (11-13 Hz) was examined at sites T3, T4, C3, and C4 in eight skilled marksmen during shooting and two control tasks varying in perceptual-motor complexity. Over an 8-s period preceding the trigger pu ll. the marksmen exhibited higher power and slope at T3 than at all other s ites during shooting compared with the control conditions. No such differen ce between conditions was detected at C3 and C4. The relative synchrony of left temporal alpha power during shooting, in conjunction with the lack of change at central sites, is inconsistent with the explanation that the effe ct is accounted for by 'lower-order' motor processes exclusively involving the central region. (C) 2001 Elsevier Science B.V. All rights reserved.