Abstract
Lateralization of cognitive functioning is a well-established principle of cerebral organization. The left and right hemispheres are known to play distinct and complementary roles in the processing of information. What is still unclear is whether these asymmetrically lateralized functions have a common or distinct developmental origin; are left and right processes lateralized through causal influences, or is the laterality of each function independently influenced? Left- and right-lateralized functions are commonly assessed in isolation, with little attention to the relationship in the degree and direction of lateralization within individuals. This relationship between left-hemisphere processing of speech sounds and right-hemisphere processing of emotional vocalizations was examined using dichotic listening tasks. An overall complementary pattern of lateralization was observed across participants, but no significant relationship was found for degree of lateralization of speech and emotional vocalization processing within individuals. These results support the view that functions in the left and right hemispheres are independently lateralized.
Highlights
Clear evidence exists for a division in cognitive functioning between the left and right hemispheres of the brain (Corballis, 1991; Sperry, 1982)
Using asymmetry scores obtained using both a speech task and an emotional vocalizations task, we examined the pattern of lateralization observed for each task in the overall sample
As the presence of ceiling performances may have influenced the overall pattern of results, we examined the correlation between Fused Rhymed Words Test (FRWT) and emotional sounds task (EST) lambda scores with all ceiling performances removed
Summary
Clear evidence exists for a division in cognitive functioning between the left and right hemispheres of the brain (Corballis, 1991; Sperry, 1982). It is argued that this division of processing enables more efficient processing of information, as each hemisphere is specialized for specific information input (Bradshaw, 2001; Levy, 1977). Coined the Modal Model by Bryden (1990), the left hemisphere is often thought of as the language center, as well as an analytic and serial processor responsible for coordinating rapid, sequential processing tasks. The right hemisphere is thought of as the visuospatial and emotional center, as well as a holistic and inte-. How to cite this paper: Harms, V. Examination of Complementarity in Speech and Emotional Vocalization Perception.
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