Another difference relates to gross anatomical asymmetries that leave
different impressions (petalias) on the internal table of bone, and
htese have some correlational (not obligate) relationship with
handedness. A more protruding left occipital petalia associated with a
broader right frontal (width) petalia is highly correlated with
rihgt-handedness. The occurrence of these petalial patterns differs
between humans and the pongids, in that pongids do show some
asymmetries but rarely if all the combination of the so-called torque
pattern described above, i.e., left-occipital, right frontal. The early
hominids show a higher frequency of the torque pattern than do pongids.
Left-handers will have a higher frequency of right-occipital, left
frontal patterns, and ambidextrals can have either pattern, or
symmetry, essentially. The relationship is NOT obligate, but
correlational, and is about 87% accurate.
Ralph Holloway.
On 30 Mar 1995, Shaun D. Carstairs
wrote:
>gordonr at cc.UManitoba.CA (Richard Gordon) writes:
>> >Is there any correlation between the asymmetries in individual brains
> >that are apparent in dorsal or ventral views, and cerebral dominance?
>> Yes. There exists a region on the dorsal surface of the temporal lobe
> known as the planum temporale. In most people, it is larger on the
> left side than on the right; most people are also dominant for language
> on the left side. However, this is not a 100% correlation, but merely
> a good indicator of linguistic dominance.
>> Shaun Carstairs
>shaunc at alumni.caltech.edu>>>
