SEX, HANDEDNESS,AND SPATIAL ABILITY AFFECT LATERALITY FOR MENTAL ROTATION
Date
2007-04
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Doctoral
Abstract
Spatial laterality refers to the localization of spatial processing within the right and left cerebral hemispheres. Although a left visual field/right hemisphere (LVF) advantage has generally been observed for spatial processing,observations of a right-visual field/left hemisphere (RVF) advantage and no visual field/no hemisphere (OVF) advantage have also been reported.The inconsistent research findings in spatial
laterality have been attributed to individual differences (e.g.,sex and handedness), although research in this area has been limited. Some evidence suggests that level of spatial ability may affect spatial laterality. For example, Voyer and Bryden (1990) reported a RVF advantage for participants with high spatial ability,a OVF advantage for participants with medium spatial ability, and a LVF advantage for participants with low
spatial ability. The main purpose of this thesis was to replicate and extend Voyer and Bryden's findings. Two experiments were conducted. Level of spatial ability (low, medium,or high) for participants was determined by performance on a standard, paperĀ and-pencil measure of mental rotation. The experimental task was a lateralized mental rotation task presented on a computer. Experiment 1 examined the performance of 52 right-handed undergraduate students. Right-handed males with low or high spatial
ability demonstrated a significant RVF advantage in performance on a lateralized spatial task. Experiment 2 examined the performance of 50 left-handed undergraduate students. Left-handed participants with low
spatial ability demonstrated a significant RVF advantage in performance on a lateralized spatial task. Left-handed females, regardless of ability level, also demonstrated a significant RVF advantage in spatial
performance. Limited support was found for the notion that level of spatial ability affects spatial laterality in right-or left-handed males and females. Rather, the results could be attributed to the linguistic nature of the experimental stimuli, which engaged a left-hemisphere verbal processing strategy.
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Degree
Doctor of Philosophy (Ph.D.)
Department
Psychology
Program
Psychology