Functions of the
Parieto-occipitotemporal Cortex in the Nondominant Hemisphere
When Wernicke’s area in the dominant hemisphere of an adult person
is destroyed, the person normally loses almost all intellectual functions
associated with language or verbal symbolism, such as the ability to read, the
ability to perform mathematical operations, and even the ability to think
through logical problems. Many other types of interpretative capabilities, some
of which use the temporal lobe and angular gyrus regions of the opposite
hemisphere, are retained.
Psychological studies in patients with damage to the nondominant
hemisphere have suggested that this hemisphere may be especially important for
under-standing and interpreting music, nonverbal visual experiences (especially
visual patterns), spatial rela-tions between the person and their surroundings,
the significance of “body language” and intonations of people’s voices, and
probably many somatic experi-ences related to use of the limbs and hands. Thus,
even though we speak of the “dominant” hemisphere, this is primarily for
language-based intellectual functions; the so-called nondominant hemisphere
might actually be dominant for some other types of intelligence.
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