Assuntos
Cegueira/fisiopatologia , Circulação Cerebrovascular , Eletroencefalografia , Leitura , Tato , Adulto , Dominância Cerebral , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Lobo Occipital/fisiologia , Lobo Parietal/fisiologia , Pletismografia de Impedância , Fluxo Sanguíneo Regional , Descanso , Percepção Espacial/fisiologia , Lobo Temporal/fisiologiaRESUMO
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.
Assuntos
Artérias Cerebrais/fisiologia , Mãos/fisiologia , Movimento , Pletismografia de Impedância/métodos , Adulto , Percepção de Cores , Tomada de Decisões/fisiologia , Discriminação Psicológica/fisiologia , Feminino , Habituação Psicofisiológica/fisiologia , Humanos , Imaginação , Masculino , Atividade Motora/fisiologia , Tempo de Reação , Fluxo Sanguíneo RegionalRESUMO
The state of mental alertness preceding a motor task is accompanied by an increase in cerebral blood flow. During the first trials, these changes seem to be chiefly related to ascending reticular impulses. Habituation lateralizes and focalizes changes which are probably due to metabolic modifications in selective expectancy. The factor E of Eysenck seems to have some correlation with the individual variations observed.
