Dr. Jeffrey A. Gray

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Rats were trained to run in an alley for food reward given on every trial (continuous reinforcement, CR) or on a random 50% of trials (partial reinforcement, PR) and were then extinguished. Sham-operated controls showed the usual partial reinforcement extinction effect (PREE), i.e., PR-trained animals were more resistant to extinction than CR-trained(More)
Rats were trained to run in an alley for food reward. In a ‘partial punishment’ condition the animals also received occasional footshock in the goalbox; controls received only food reward during training. In a test phase all animals were given both food and footshock in the goalbox on every trial. Previously partially punished animals demonstrated greater(More)
32 male rats, of which half had sustained small electrolytic lesions in the medial septal area and half had received sham operations, were trained on continuous reinforcement to run an alley for water reward and then given four days of extinction testing. Half of both the lesioned and sham-operated groups were given sodium amylobarbitone on Days 1 and 2 of(More)
The threshold current of septal stimulation required to drive the hippocampal theta rhythm was investigated as a function of stimulation frequency in male rats aged 12–19 days. The minimum in the threshold-frequency function at 7.7 Hz, characteristic of adult male rats, appeared at 15–16 days. Before that age the relation between frequency and threshold was(More)
Data were collected on the effects of pipradrol hydrochloride and sodium amylobarbitone on operant responding by rats in a discrimination situation. It was found that pipradrol caused a marked increase in the animals' general excitement and interfered with eating behaviour, especially in the 10 mg/kg dose. It also greatly increased the variability of(More)
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