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Abstract
To address prior reports that schizophrenia is associated with loss of normal brain
asymmetry and that it might be linked to a defect of a gene controlling cerebral laterization,
we measured on three-dimensional cortical renderings from magnetic resonance imaging
(MRI) scans the lengths and angles of the sylvian fissures in 10 normal monozygotic
(MZ) twin pairs (n = 10 pairs) and in 10 MZ pairs discordant for schizophrenia (n
= 10 pairs). We confirmed in both sets of twins the expected normal asymmetries of
length and angle of the sylvian fissure. We also confirmed that the length asymmetry
occurs solely in the region of the planum temporale. In the discordant twins, affected
and unaffected twins did not differ in asymmetry measures, thus failing to support
an association between illness per se and diminished asymmetry. Moreover, the discordant
twins as a group did not differ from the normal twins as a group, thus failing to
confirm the hypothesis of a genetic association with abnormal asymmetry. The implications
of variations in methodology and patient samples are discussed.
Keywords
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Article info
Publication history
Received in revised form:
October 7,
1993
Received:
April 5,
1993
Identification
Copyright
© 1993 Published by Elsevier Inc.