Expectancy and response strategy in a three-choice visual task.
We investigated the relationship between sensorial discrimination and motor response by means of movement-related potentials, in a task where subjects had to discriminate between 3 stimuli presented visually in a random way. The results indicate that subjects anticipate the response to each type of stimulus by following a probabilistic criterion in the absence of a warning stimulus. This criterion entails an erroneous lateralization of cerebral activation and a significant increase in reaction time, despite the reduction of errors.
Ortiz
T
T
Departamento de Psicobiología, Universidad Complutense de Madrid, Spain.
Maestú
F
F
Fernández
A
A
D000328:Adult; D003265:Contingent Negative Variation / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D013647:Task Performance and Analysis; D013997:Time Factors