Retinae taken from embryonic rats were transplanted over the midbrain of neonatal rats, from whom one eye had been removed. After 5 months, the optic nerve of the remaining eye was cut, and the transplant was exposed. Illumination of the transplant caused pupilloconstriction of the host eye, a response abolished by damaging the transplant. Thus neural transplants are capable of driving specific reflexes in response to natural stimuli.
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Klassen et al. (1987) studied this question.