Age- and stimulus-specific use of right and left eyes by the domestic chick
1994
Dharmaretnam, M. | Andrew, R.J.
Domestic chicks, Gallus gallus domesticus, are known to show bias to left hemisphere control on day 8 and to right on days 10 and 11. These shifts were here shown to affect viewing, so that the eye feeding the controlling hemisphere was used to view either a simple object to which the chick was socially attached or a hen seen for the first time (i.e. right eye, day 8; left, day 11). Right hemisphere bias was maximal on day 11. Timing of shifts did not differ between the sexes, and so cannot explain sex differences in tests of lateralization. In females, different stimuli tended to evoke different patterns of eye use, which were superimposed on the age-dependent shifts: the hen tended to be viewed with the right eve, and a small simple novel stimulus (a small light) with the left. Both of these patterns are consistent with other evidence for the specializations of left and right hemisphere. Other viewing patterns involved both hemispheres: the most unexpected was the use, by the hemisphere that because of age was the controlling one, of the subordinate hemisphere to monitor the stimulus.
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