title: Effects of retinal eccentricity on the lateralized processing of categorical and coordinate spatial relations.
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.
authors.affiliation: Medical University of South Carolina. hornermd@musc.edu
authors.forename: M D
authors.initials: MD
authors.lastname: Horner
authors.forename: D
authors.initials: D
authors.lastname: Freides
mesh_terms: D000328:Adult; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D008297:Male; D011930:Reaction Time / Q000502:physiology; D012160:Retina / Q000502:physiology*; D013028:Space Perception / Q000502:physiology*