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Laterality of cerebral function: relations with anxiety, repression, and perception.

K J Kennelly, G Wilcox

Perceptual and Motor Skills

|June 1, 1985

Summary

This study suggests that stronger right-handedness may correlate with reduced right hemisphere inhibition, potentially influencing perception. Working short-term memory may not be lateralized in the brain.

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Area of Science:

Neuroscience
Cognitive Psychology
Human Laterality

Background:

Understanding brain lateralization and its relationship with cognitive functions is crucial.
Previous research has explored handedness and hemispheric balance, but their precise links to perception and memory remain debated.

Purpose of the Study:

To develop a laterality quotient (LQ) to assess hemispheric balance.
To investigate the relationship between this LQ, handedness, repressive tendencies, perceptual style, and working short-term memory.

Main Methods:

Two factor analyses were conducted on data from 67 right-handed undergraduates.
A laterality quotient was devised using forward memory spans (spatial minus digit, divided by their sum).
Correlations were examined with the Edinburgh Handedness Questionnaire, Marlowe-Crowne Social Desirability Scale, Navon tachistoscopic task, trait anxiety, and working short-term memory.

Main Results:

The devised laterality quotient served as a principal marker for a hemispheric balance factor.
This factor positively correlated with right-handedness (Edinburgh Handedness Questionnaire) and repressive tendencies (Marlowe-Crowne Social Desirability Scale).
Hemispheric balance was positively related to global perception and unrelated to trait anxiety and working short-term memory; trait anxiety negatively related to global perception.

Conclusions:

Greater right-handedness may be associated with the release of the nondominant right hemisphere from inhibition.
Working short-term memory may not be a lateralized cognitive function.
Hemispheric balance, as indicated by the LQ, is linked to perceptual style and personality traits.

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