Does amphetamine increase schedule-induced drinking reduced by negative punishment procedures?
These results support the contention that d-amphetamine has an increasing effect on schedule-induced drinking that has been previously reduced by a negative punishment procedure. This effect cannot be attributed to other potentially involved processes, and therefore support the idea that drug effects on punished behaviour depend on punishment being delays in food or shock deliveries.
These data suggest that dysfunction of the intestinal barrier in TPN might be associated with a change of uptake by Peyer's patches.