Hemispheric asymmetry in processing visual stimulus orientation

Wolff, Lynn Bernice (1973) Hemispheric asymmetry in processing visual stimulus orientation. Masters thesis, Memorial University of Newfoundland.

[English] PDF (Migrated (PDF/A Conversion) from original format: (application/pdf)) - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Download (3MB) [English] PDF - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. (Original Version)

Abstract

This study investigated the possibility of differential processing by the two cerebral hemispheres in recognizing the second of two successively presented digits. The second digit was either normally oriented or else it had been rotated 180ﾟ around one of three different axes of visual space. A same-different reaction times task was used with three factorially combined within-subjects variables: Stimulus Position (Left, Right Visual Field) x Orientation (Normal, Rotated) x Hand (Left, Right), and one between-subjects variable: Axis of Rotation (X, Y, Z). An interaction was obtained between Stimulus Position and Orientation; normal and rotated forms were processed equally well when presented in the left visual field, whereas in the right visual field there was a significant difference in favour of the normally oriented forms. The results indicate that the left and right cerebral hemispheres may differ in how they process spatially transformed shapes.

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