APPLICATION OF THE MATCHING LAW FOR QUANTIFYING THE REINFORCING VALUE OF ELECTRICAL BRAIN-STIMULATION by Fray, P, Iversen, S

Tail-pinch stimulation: sufficient motivation for learning. by Koob, G, Fray, P, Iversen, S

IS DOPAMINE NECESSARY FOR ELECTRICAL BRAIN-STIMULATION TO BE REWARDING by Fray, P, Koob, G, Iversen, S

Self-stimulation at the lateral hypothalamus and locus coeruleus after specific unilateral lesions of the dopamine system. by Koob, G, Fray, P, Iversen, S

Tail-pinch-elicited behavior in rats: preference, plasticity, and learning. by Fray, P, Koob, G, Iversen, S

TAIL-PINCH AND T-MAZE LEARNING BY RATS by Fray, P, Koob, G, Iversen, S

Tail pinch versus brain stimulation: problems of comparison. by Fray, P, Koob, G, Iversen, S

An observational method for quantifying the behavioural effects of dopamine agonists: contrasting effects of d-amphetamine and apomorphine. by Fray, P, Sahakian, B, Robbins, T, Koob, G, Iversen, S

Nigral transplants reinnervating the dopamine-depleted neostriatum can sustain intracranial self-stimulation. by Fray, P, Dunnett, S, Iversen, S, Björklund, A, Stenevi, U

SELF-STIMULATION FROM SUBSTANTIA NIGRA TRANSPLANTS - EVIDENCE OF SPECIFIC DOPAMINERGIC ACTIVATION OF THE STRIATUM by Fray, P, Dunnett, S, Bjorklund, A, Stenevi, U, Iversen, S