Chapter

Adextrality

Doreen Kimura

in Neuromotor Mechanisms in Human Communication

Published in print December 1993 | ISBN: 9780195054927
Published online January 2008 | e-ISBN: 9780199872268 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780195054927.003.0009

Series: Oxford Psychology Series

 Adextrality

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This chapter discusses how patterns of brain organization for speech and praxic function vary with hand preference. In an unselected group of adextral patients without early CNS pathology, speech representation was more dependent on the left hemisphere than on the right, consistent with the literature. However, it is argued that speech may even be more generally bilaterally organized in adextrals than the Amytal data suggest. Despite the evidence for greater dependence of speech function on the left hemisphere in the sample, manual praxic function is clearly more dependent on the right hemisphere. This appears to be true for both ambidexters and left-handers. These findings raise some difficulty for theories of left-handedness, which propose that adextrality is the random consequence of the absence of dextrality.

Keywords: brain organization; speech; praxic function; hand preference; left-handed; dextrality

Chapter.  3207 words.  Illustrated.

Subjects: Neuropsychology

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