Stroke, Vol 20, 1005-1011, Copyright © 1989 by American Heart Association
DW Droste, AG Harders and E Rastogi
While changes in blood velocity in the middle cerebral artery relative to
rest were assessed by transcranial Doppler sonography, 70 volunteers with
no sign of cerebrovascular disease performed two (left and right middle
cerebral artery) series of six cognitive tasks. The tasks are assumed to be
processed predominantly by either the left (verbal and mathematical tests
performed aloud) or the right hemisphere (dot/distance estimation, spatial
perception, and face recognition performed silently). All tasks were shown
to increase middle cerebral artery blood flow velocity on both sides, by
1.6-10.6%. After an initial maximum at approximately 8 seconds, velocity
decreased then increased again. A steady state was reached after
approximately 24-42 seconds. The initial minimum during the following rest
phase was reached some seconds later, followed by a slow increase to the
reference rest steady state. A difference according to side could be
determined only during the three right-hemispheric tasks (right greater
than left, 2.5-2.9%). Left-handedness/ambidexterity, familial sinistrality,
and profession seemed to have no influence on the results. The middle
cerebral artery blood flow velocity increase on both sides was higher in
women than in men during the dot/distance estimation and was also higher
bilaterally in older than in younger subjects during the dot/distance and
the spatial perception tasks. Habituation in performing the tasks was an
important factor associated with a decrease of blood flow velocity,
especially in the right middle cerebral artery. The habituation more
pronounced on the right side possibly reflects the role of the right
hemisphere in attention and arousal. The absolute blood velocities at rest
decreased bilaterally with age.
ARTICLES
A transcranial Doppler study of blood flow velocity in the middle cerebral arteries performed at rest and during mental activities
University of Freiburg Medical School, Federal Republic of Germany.
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