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Differences Between Normals and Schizophrenics on Activation-induced Change in Two-flash Fusion Threshold

Published online by Cambridge University Press:  29 January 2018

D. J. Hieatt  and
J. E. Tong
D. J. Hieatt
Affiliation:
University of Guelph, Ontario, Canada
J. E. Tong
Affiliation:
University of Guelph, Ontario, Canada
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Extract

Research relating brain stem stimulation and cortical selectivity by Lindsley (1957) led Venables (1963) to utilize a score from a perceptual discrimination task (two-flash fusion threshold, T.F.T.) to examine hypotheses relating arousal level to perceptual dysfunction and schizophrenic symptoms. Other work failed to confirm the results (Hume and Claridge, 1965), possibly due to the unsuitable method of determining T.F.T., a method of constant stimuli. The following experiments were based on the proposition that perceptual functioning is related to arousal level, and also attempted to resolve confusions arising from earlier studies by control of possible sources of error in the experimental situation.

Type
Short Papers
Information
The British Journal of Psychiatry , Volume 115 , Issue 521 , April 1969 , pp. 477 - 478
Copyright
Copyright © Royal College of Psychiatrists, 1969 

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References

Hume, W. I., and Clartooe, G. S. (1965). “A comparison of two measures of ‘arousal’ in normal subjects.” Life Sci., 4, 545–553.CrossRefGoogle Scholar
Lindsley, D. B. (1957). “The reticular system and perceptual discrimination.” In: Reticular Formation of the Brain (eds. Jasper, H. H. et al.), London.Google Scholar
Pearson, L. A., and Tong, J. E. (1968). “Two flash fusion: the effects of age, method, etc.” Brit. J. Psychol., 59, 407–414.CrossRefGoogle Scholar
Venables, P. H. (1963). “The relationship between level of skin potential and fusion of paired light flashes in schizophrenic subjects.” J. psychiat. Res., 1, 279–287.CrossRefGoogle Scholar
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