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Motor learning in rats: modification of the pattern of reaching and licking by operant conditioning.

Motor learning was studied in computer controlled experiments in which the prolongation of a definite phase of a discrete movement was reinforced by intracranial selfstimulation or by the offer of water. In Experiment 1, rats slowed down the retraction phase of the lateralized reaching reaction from 300 ms to 512 ms. In Experiment 2, rats learned to follow computer generated spout movement by increasing the interlick interval or by alternating long and short licks.

Animals↗

Operant conditioning of vocalization rate of infants with Down syndrome.

Reinforcement control over vocalization rates of infants with Down syndrome was evaluated; elicitation of vocalizations by social stimulation was controlled. Parents of three infants (2.7, 5, and 8.2 months old) provided social reinforcement under two schedules: continuous reinforcement for vocalization (CRF) and differential reinforcement of other-than-vocalization (DRO). All infants produced systematically higher vocalization rates during CRF, even though the amount of social stimulation during DRO was equal to or greater than the amount provided during CRF. The results replicated findings with normally developing infants and support a contingent-stimulation model of intervention for infant vocal communication.

Behavior Therapy↗