Abstract
When the rat's eyes open (P14) the retino-collicular projection is largely mature but the cortico-collicular afferents are naive and mature considerably in the following week. At P14, single units in the superior colliculus' superficial grey layer (SGS) had discrete receptive fields (RFs) (diameter=15±1.6°) which expanded with age, reaching 30±2.6° at P21, possibly reflecting the increasing influence of the visual cortex, whose RFs are known to be enlarged at P21. Subsequently SGS RFs retracted to 13±1.3° by P23. Dark-reared (DR) rats followed a similar but delayed developmental pattern, such that RFs were still large (27±3.4°) at P24. By P30 however the RFs of DR rats were the same as those of normal adults. Thus visual experience accelerates the emergence of normal RFs in the SGS. © 1997 Elsevier Science B.V. All rights reserved.
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