Book Reviews

M arion M ilner : The hands of the living God
L eonard P eonard : Death and dying
G ertrud H ess : Biology—psychology: two ways of research into life
G erald H andel (Ed.): The psychosocial interior of the family
H ans Z ulliger : The Zulliger individual and group test     

A multiple-choice airstream design for olfactory discrimination training of small animals

A multiple wind-tunnel olfactory discrimination apparatus is described and evaluated. The apparatus allows for the simultaneous presentation of odor or visual cues and permits direct comparisons to be made on visual and olfactory discrimination performance.     

Time-dependent contrast effects in a multiple schedule of food reinforcement

Four rats were rewarded for running in a wheel under two alternating conditions of food reinforcement. These periods of frequent and infrequent reinforcement, each accompanied by a particular stimulus, were presented a number of times in each daily session. Following shifts from high to low frequency of reinforcement, responding decreased suddenly and markedly, and then recovered within the next few minutes. The magnitude of this temporary depression was an increasing function of the duration of the immediately preceding component of high-frequency reinforcement. A transient elevation in performance, which did not vary with the duration of the prior component, was noted in two subjects following shifts from low to high frequency of reinforcement. The elevation and depression effects did not appear simultaneously during the 48 experimental sessions. A possible relation between the difficulty of the discrimination and the extent of contrast effects is discussed.     

Book reviews

Contemporary psychology Experiments: Adaptations for Laboratory. By John Jung and Joan Bailey. London and New York: Wiley. 1966 Pp. xiii + 155. 238.

A Textbook of Psychology. Second Edition. By D.O. Hebb. Philadelphia and London: W.B. Saunders & Co. 1966. Pp xvi + 353. Pound2.

Behaviour Therapy Techniques: A Guide to the Treatment of Neuroses. By Josweph Wolpe and Arnold A. Lazarus. Oxford and London: Pergamon Press. 1966. Pp. ix + 198. 21s.

Motivated Learning: a Developmental Study from Birth to the Senium. By Miriam E. Hebron. London: Methuen. Methuen's Manuals of Modern Psychology. 1966. Pp. 264. 35s.

Human Brain and Psychological Processes. By A.R. Luria. Translated by Basil Haigh. New York and London: Harper & Row. 1966. Pp.xix + 587. £5 $14.50.

Higher Cortical Functions in Man. By A. R. Luria. Translated by Basil Haigh. London: Tavistock Publications. 1966. Pp xvi + 513. £6 6s.

Productive Thinking. By Max Wertheimer. Edited by Michael Wertheimer. social science Paperbacks. London: Tavistock Publications. 1966. Pp xvi + 302. 30s.

Problem Solving: Research Method and Theory. Edited by B. Kleinmuntz. London and New York: Wiley. 1966. Pp. ix + 406. 53s.

Human Conceptual Behavior. By Lyle E. Bourne, Jr. Boston: Allyn and Bacon. 1966. Pp. viii + 139. $2.50.

Attraction and Hostility. An Experimental Analysis of Interpersonal and Self Evaluation. By albert Peptone. London: Tavistock Publications. 1966. Pp. ix + 234. 30s.

Ability Structure and subgroups in Mental Retardation. By John Clausen. London: Macmillan. Washington: spartan Books. 1966. Pp. viii + 208. 80s.

The Biologiv Basis of Schizophrenia. By Jon L. Karlsson. springfield. Illionois: Thomas. 1966. Pp.xi + 77. $4.75.

Psychology for Psychiatrists. By C.G. Costello. London: Commonwealth and Unversity Library, pergamon Press. 1966. Pp. 328. 25s.

Science and theory of Psychoanalysis. Edited by Irwin G. Sarason. London: Van Nostrand. Insight Book No. 26. 1965. Pp xiii + 205. 14s.

Aspects of Learning and Memory. Edited by D. Richter. London: heinemann. 1966. Pp. x + 185. 35s.

The Spiral After-Effect. By Harry C. Holland. London: pergamon. 1965. Pp.xii + 99. 35s.

Dynamics of Response. By J.M. Notterman and D.E. Mintz. London and New York: Wiley. 1965. Pp. 277. 70s.

Contrary Imaginations: A Psychological Study of the English Schoolboy. By Liam Hudson. London: Methuen. 1966. Pp. vii + 181. 25s.

The Structure of Association in Language and Thought. By James A. Deese. London: Oxford University Press: Johns Hopkin Press. 1960. Pp. xiii + 216. 52s.

A source Book in the History of Psychology. Edited by R. J. Herrnstein and E.J. boring. London: Oxford University Press; Harvard University Press. 1965. Pp. xvii + 636. £5.     

Eye movement indices of mental workload

Four investigations were carried out to assess the feasibility of using eye movement measures as indices of mental workload. In the first experiment, saccadic extent was measured during free viewing while subjects performed low, moderate and high complexity, auditory tone counting as the workload tasks. The range of saccadic extent decreased significantly as tone counting complexity (workload) was increased. In the second experiment the range of spontaneous saccades was measured under three levels of counting complexity with a visual task that did not require fixation or tracking. The results indicated that the extent of saccadic eye movements was significantly restricted as counting complexity increased. In the third experiment, the effects of practice were examined and decreased saccadic range under high tone counting complexity was observed even when significant increases in performance occurred with practice. Finally, in experiment 4, the first experiment was repeated with additional optokinetic stimulation and the saccadic range was again observed to decrease with tone counting complexity. The results indicated that the extent of spontaneous and elicited eye movements was significantly restricted as counting complexity increased. We conclude that this measure may provide a valuable index of mental workload.     

Conditioned reinforcement versus time to reinforcement in chain schedules.

Pigeons were trained on three-component chain schedules in which the initial component was either a fixed-interval or variable-interval schedule. The middle and terminal components were varied among fixed-interval fixed-interval, variable-interval variable-interval, and an interdependent variable-interval variable-interval schedule in which the sum of the durations of the two variable-interval components was always equal to the sum of the fixed-interval fixed-interval components. At issue was whether the response rate in the initial component was controlled by its time to primary reinforcement or by the temporal parameters of the stimulus correlated with the middle terminal link. The fixed-interval initial-link schedule maintained much lower response rates than the variable-interval initial-link schedule regardless of the schedules in the middle and terminal links. Nevertheless, the intervening schedules played some role: With fixed-interval schedules in the initial links, response rates were consistently highest with independent variable-interval schedules in the middle and terminal links and intermediate with the interdependent variable-interval schedules; these initial-link differences were predicted by the response rates in the middle link of the chain. With variable-interval schedules in the initial links, response rates were lowest with the fixed-interval fixed-interval schedules following the initial link and were not systematically different for the two types of variable-interval variable-interval schedules. The results suggest that time to reinforcement itself accounts for little if any variance in initial-link responding.