Effect of Calculation Task 
on the Regional Cerebral Blood Flow Velocity:
a  Transcranial Doppler Study

J Korean Neurol Assoc > Volume 16(3); 1998 > Article

Journal of the Korean Neurological Association 1998;16(3): 271-274.

경두개초음파 검사를 이용한 계산 작업에 따른 국소 뇌혈류변화

김만호, 이상복, 노재규

서울대학교 의과대학 신경과학교실

Effect of Calculation Task on the Regional Cerebral Blood Flow Velocity: a Transcranial Doppler Study

Manho Kim, M.D., Sang Bok Lee, M.D., Ph.D, Jaekyu Roh, M.D., Ph.D.

Dept. of Neurology, Seoul National University Hospital

Abstract

Blood flow velocity changes induced by the focal brain activation can be assessed by using Transcranial Doppler sonography (TCD). To explore the hemispheric dominant hemodynamic effect by performing calculation, we applied TCD technique to detect cerebral blood velocity asymmetry. METHODS Twenty healthy right-handed subjects were tested. We measured mean flow velocities (MFV) in the middle and posterior cerebral arteries (MCA, PCA). Photic stimulation was given separately as a control task for calculation. RESULTS While the photic stimulation increased the blood velocity only in PCAs, performing calculation increased the velocity in MCAs. Right-left difference was noted by performing calculation with greater increase in left MCA (right: 8.8 %; left: 21.2 %). CONCLUSION Application of TCD enabled us to measure the hemodynamic changes supporting the left hemispheric dominance of calculation task. Futhermore, increase in non-dominant right hemisphere suggests the functional interaction of cerebral activity. KEY WORDS: Calculation, Cerebral Blood Flow, Transcranial Doppler Ultrasonography (TCD), Cerebral Dominance