Accession Number : AD0630391

Title :   PSYCHOPHYSICAL METHODOLOGY III. DEDUCTIONS FROM THE ASSUMPTION THAT A CUMULATIVE SYMMETRICAL DISTRIBUTION UNDERLIES THRESHOLD PHENOMENA,

Corporate Author : NAVAL AIR DEVELOPMENT CENTER JOHNSVILLE PA AEROSPACE MEDICAL RESEARCH DEPT

Personal Author(s) : Herrick,Robert M.

Report Date : 31 DEC 1965

Pagination or Media Count : 18

Abstract : The phi-gamma and quantal hypotheses are special cases of the hypothesis of a cumulative symmetrical distribution. Assuming any cumulative symmetrical distribution it follows that: (a) a descending method of limits (DML) threshold distribution is a mirror image of an ascending method of limits (AML) threshold distribution; (b) the DML mean threshold, M sub D, is higher than the AML mean threshold, M sub A; (c) M sub A + M sub D = S sub O + S sub n, where S sub O and S sub n are the stimuli associated with p values (probability of a 'Yes' response) of .00 and 1.00, respectively; (d) the median threshold of the method of constant stimuli is (S sub O + S sub n)/2, as is the mean threshold of the pooled AML and DML distributions. (Author)

Descriptors :   (*PSYCHOPHYSIOLOGY, *DISTRIBUTION), STATISTICAL ANALYSIS, NUMERICAL ANALYSIS, THRESHOLDS(PHYSIOLOGY), PROBABILITY, MEASURE THEORY, PSYCHOLOGICAL TESTS

Subject Categories : Psychology
      Statistics and Probability

Distribution Statement : APPROVED FOR PUBLIC RELEASE