PSYCHOPHYSICAL METHODOLOGY II. COMPARISON OF MEANS AND OF STANDARD DEVIATIONS OF THE ASCENDING AND DESCENDING METHOD OF LIMITS.

Assume that the probability of a 'Yes' response increases as the stimulus intensity increases. Then, on the basis of probability considerations alone (a) the mean threshold of the descending method of limits (DML) is greater than the mean threshold of the ascending method of limits (AML) a...

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Bibliographic Details
Main Author: Herrick,Robert M.
Other Authors: NAVAL AIR DEVELOPMENT CENTER JOHNSVILLE PA AEROSPACE MEDICAL RESEARCH DEPT
Format: Text
Language:English
Published: 1965
Subjects:
Psychology
Statistics and Probability
*PSYCHOPHYSIOLOGY
STIMULATION(PHYSIOLOGY)
STATISTICS
DML
Online Access:http://www.dtic.mil/docs/citations/AD0628995
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0628995
Description
Summary:Assume that the probability of a 'Yes' response increases as the stimulus intensity increases. Then, on the basis of probability considerations alone (a) the mean threshold of the descending method of limits (DML) is greater than the mean threshold of the ascending method of limits (AML) and (b) sigma of the DML threshold distribution may be greater than, equal to, or less than sigma of the AML threshold distribution. Therefore, (a) the present method for evaluating errors of expectation and habituation is erroneous, (b) the 'just not noticeable difference' (jnnd) should always be larger than the 'just noticeable difference' (jnd), (c) conclusions about relative precision based on a comparison of sigma s are wrong. (Author) See also AD-628 994.

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