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Title: A study of some types of subjective judgment made during industrial inspection
Author: Thomas, L. F.
ISNI:       0000 0004 2722 8646
Awarding Body: Birkbeck (University of London)
Current Institution: Birkbeck (University of London)
Date of Award: 1963
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A study of twenty-five industrial inspection tasks i sused to illustrate how different areas of psychologicl laboratory work are relevant to a better understanding of the many factors which can influence an industrial inspectors judgment. a method is outlines for gradually developing a mathematical model which would predict the actuial sequences of judgments made by any one person when presented with a given sequence of items, under known social and physical conditions. Helson's Adapatation Level theory is the most adequate existing theory of judgment, but certain weaknesses are identified whe it is used to preduct individual responses of individual subjects. A stochastic model is devised to simulaye limited aspects of the process of judgment. A computer is programmed to calculate the consequences of this model for one given experimental situation. The experimental situation involves self-paced judging of the intensities of spots of light. A sequence of 1.97 s[pots are judged on a five-point response scale under constant conditions. Individual results obtained from seventeen out of eighteen subjects are better matched by the computer than by Helson's theory. Another experiment is divised in which the length of brass rods are judged by touch. it is shown that there is a qualitative difference between the predictions from Adaptation Level theory and those from the mathematical model, about what will happen to a subject's scale of judgment when he is exposed to uneven distributions of ecperience over a constant range of stimuli. The results from eighteen subjects show a highly significant change in the subjective scales. These contract where the experience is most concentrated. The model had predicted this, Adaptation Level theory had not. Detailed suggestions for developing a model to cover a greater range of phenomena are discussed, and methods for proceeding are outlined.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available