Citation

Bridgeman B, Gemmer A, Forsman T, Huemer VA. Vision Res. 2000; 40(25): 3539-3552.

Affiliation

Department of Psychology, University of California, Santa Cruz, CA 95064, USA. bruceb@cats.ucsc.edu

Copyright

(Copyright © 2000, Elsevier Publishing)

DOI

unavailable

PMID

11115681

Abstract

We distinguish two representations of visual space: a cognitive representation drives perception, and a sensorimotor representation controls visually guided behavior. Spatial values in the two representations are separated with the Roelofs effect: a target within an off-center frame appears biased in a location opposite the direction of the frame. The effect appears for a verbal measure (cognitive) but not for a jab at the target (sensorimotor). A 2-s response delay induces a Roelofs effect in the motor measure, showing the limit of motor memory. Motor error is not correlated with reaction time. Subjects could strike one of two identical targets, a process involving choice, without intrusion of a Roelofs effect, showing that the sensorimotor system can use its own coordinates even when a cognitive choice initiates the motor processing.

Language: en