Abstract
Reorganization of the goldfish retinotectal projection after ablation of half the tectum is dependent on lighting conditions and season. It occurs in summer but not in winter in normal lighting conditions. Constant light prevents reorganization in summer. Treatment with thyroxine at times when it does not normally occur results in some reorganization of the projection in a majority of cases. This consists of reduplicated receptive fields and partial compression. The ability of thyroxine to induce reorganization is not related to the amount of optic fibre sprouting it produces, suggesting that it may be acting on synapse formation. A hormonal influence on reorganization has been demonstrated and this may underlie the effects of season and lighting conditions, which are both known to be associated with changes in hormone levels in fish.
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