Recent reports on autopsy material (Aboitiz et al., 1992c; Witelson and Kigar, 1992; Ide et al., 1996) indicate that sex differences in Sylvian asymmetries are not significant. In a postmortem study, Witelson and Kigar (1992) determined that the horizontal segment of the Sylvian fissure (see below) tends to be larger bilaterally in right-handed than in nonconsistent right-handed men. In females there were no differences. In general, many studies have determined that when an anatomical relationship exists between functional laterality and structural asymmetry, it is more significant in males than in females (Aboitiz and Ide, 1998). However, this difference may be marginally significant or simply not robust, resulting in discrepant findings across studies when sample sizes are at the limit of statistical power.
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