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[Development of tectum-striatum and striatum-tectum connections in the chick].

In the chick, polyphasic evoked responses displaying a first negative component have been registered in the superficial part of the "Wulst" after stimulation in the depth of the contra or ipsilateral optic tectum, as early as the first hours following hatching. Moreover, responses on the surface of the tectum have been elicited by contra or ipsilateral stimulation of the Wulst. Latencies of both responses decrease markedly with increasing age but, in the whole, ipsilateral responses remain more latent than contralateral responses.