Abstract
Kosslyn's (1987) hypothesized cerebral hemispheric asymmetries for processing categorical and coordinate spatial relations were explored, using stimuli presented at varying degrees of retinal eccentricity. Thirty-three adult males performed hemifield reaction-time tasks requiring categorical or coordinate judgements. The hypothesized asymmetries were observed when stimuli were presented at 3 degrees of visual angle, but not at 1 or 9 degrees. Nevertheless, correlational analyses supported the existence of separate neural subsystems for categorical and coordinate processing. The results suggest that the model accurately predicts performance asymmetries only under specific conditions.
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