TY  - JOUR
PY  - 1997//
TI  - Differences between left- and right-hand reaction time rhythms: indications of shifts in strategies of human brain activity
JO  - Brain research. Cognitive brain research
A1  - Shub, Y.
A1  - Ashkenazi, I. E.
A1  - Reinberg, A.
SP  - 141
EP  - 146
VL  - 6
IS  - 2
N2  - Reaction time (RT) measurements serve as quantitative indices for pilots' cognitive processes of the brain. To examine if laterality exists in the brain hemispheres we measured, by the use of a Pilot Evaluation System (PES), right- and left-hand performance rhythms as indicative of RT to audible and visual stimuli. The tests included sets of simple tasks and complex ones to which a secondary task composed of audio signals was added. The accuracy of recorded reaction time was 27 ms. Seven right-handed males, 27-42 years of age, experienced with the PES flight simulator, were tested every 2 h, nine times daily (starting at 08:00 h) during 3 consecutive days. The results indicated that for simple tasks, the 24 h period of RT rhythm is either exclusive or prominent for both hands. For complex tasks the prominent period of RT is 24 h for the right (dominant) hand and 8 h for the left (non-dominant) hand (right-hand 24 h period Fstat = 140, r2 = 0.62 and 8 h period Fstat = 25, r2 = 0.22; left-hand 24 h period Fstat = 44, r2 = 0.34 and 8 h period Fstat = 100, r2 = 0.54). The findings suggest that a laterality exists in the brain hemispheres with regard to differences in rhythm periodicities. The expression of this laterality is dependent on the task-load level and points to a strategy of linkage and integrity in brain activity.<p /> <p>Language: en</p> 
LA  - en
SN  - 0926-6410
UR  - http://dx.doi.org/
ID  - ref1
ER  -