Near-death experiences: Perceptionis reality

The authors propose three etiologies responsible for the neardeath experience, which they refer to as an altered state of consciousness: physiologic, pharmacologic, and psychologic. They recommend research to determine what developmental factors influence the emotionality of the experience and how in-depth understanding can be used to provide better patient care.     

Book reviews

SINGER, J. L. (Ed.). The Child's World of Make-Believe. New York: Academic Press. 1973. PP. 294. £5.75.

CRUE, B. L. (Ed.). Pain Research and Treatment. New York: Academic Press. 1975. Pp. 417. £12.50.

BEILIN, H. Studies in the Cognitive Basis of Language Development. New York: Academic Press. 1975. Pp. 420. £11.25.

ROLLS, E. T. The Brain and Reward. Oxford: Pergamon Press. 1975. Pp. 115. £3.00.

GAZZANIGA, M. S. and BLAKEMORE, C. Handbook of Psychobiology. New York and London: Academic Press. 1975. Pp. 639. £15.15.

KULLER, R. (Ed.). Architectural Psychology. Stroudsberg: Dowden, Hutchinson and Ross. 1973. Pp. 450. S.Kr. 69.

CANTER, D. and LEE, T. (Eds). Psychology and the Built Environment. London: Architectural Press. 1974. Pp. 213. £7.50.

CLARE, A. Psychiatry in Dissent. Controversial Issues in Thought and Practice. London: Tavistock Publications. 1976. Pp. xvii +438. £7.50 (hardback); £4.00 (paperback).

RACHMAN, S. J. and PHILIPS, C. Psychology and Medicine. London: Temple Smith. 1975. PP. 223. £3.75.

VURPILLOT, ELIANE. The Visual World of the Child. London: George Allen & Unwin Ltd. 1976. Pp. 372. £9.50.

FALMAGNE, R. J. (Ed.). Reasoning: Representation and Process. London and New York: Wiley. 1975. Pp. 275. £10.15.

FANT, G. and TATHAM, M. A. (Eds). Auditory Analysis and Pevception of Speech. London: Academic Press. 1975. Pp. 564. £12.00.     

Interactions between the discriminative and aversive properties of punishment

Punishment acquires a discriminative property when it is selectively paired with either reinforcement or extinction. At the milder punishment intensities, the discriminative control exerted by punishment is similar to the discriminative control exerted by a response-produced neutral (nonaversive) stimulus. However, the effect of the aversive property is apparent as the intensity of the punishment is increased. The aversive property of the punishment acts to enhance the discriminative control when the punishment is selectively applied during extinction periods, and to attenuate the discriminative control when the punishment is selectively applied during reinforcement periods. One major difference was found between the control exerted by the punishment and the response-produced neutral simulus: Responding greatly increased after the S^Δ punishment but not after the S^Δ neutral stimulus; this increase in responding was independent of the punishment intensities studied.