Regional cerebral blood flow during voluntary movements of the hand. A rheoencephalography study

Cerebral impedance changes (F changes) indicating cerebral blood flow variations in the central and precentral areas were measured with a rheographic technique in normal subjects preparing for and carrying out a motor task. The time course of the F changes was studied and several significant correlations were established between the amount of F changes, their distribution and the motor performance. Our findings confirm that frontal and premotor regions play an important part in decision making.