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INSPECTION TIME AND MEASURED INTELLIGENCE
Author(s) -
NETTELBECK T.,
LALLY M.
Publication year - 1976
Publication title -
british journal of psychology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.536
H-Index - 92
eISSN - 2044-8295
pISSN - 0007-1269
DOI - 10.1111/j.2044-8295.1976.tb01493.x
Subject(s) - psychology , audiology , wechsler adult intelligence scale , intelligence quotient , statistics , consistency (knowledge bases) , affect (linguistics) , developmental psychology , cognition , communication , mathematics , psychiatry , medicine , geometry
Ten subjects with WAIS Full Scale IQ scores ranging from 119 to 47 were required to discriminate between two lines of markedly different length, exposed in random order for ten different durations, by pressing one of two keys. Estimates of inspection time Λ, the rate at which sensory input is accumulated and passed to subsequent decision processes, were calculated directly from the psychometric functions obtained. Λ was found to correlate negatively with subtests contributing to Performance IQ. There was a substantial degree of consistency between estimates of Λ on two different occasions and training did not appear to affect the index, although differences between the two estimates increased as the value of the first estimate increased. Mean overall response latency did not correlate significantly with intelligence and measures obtained from retarded subjects were very like those reported in similar experimental situations utilizing normal subjects. This unexpected finding is interpreted as suggesting that, in this situation, retarded subjects have been prepared to respond on the basis of less evidence than is usually required by intellectually normal subjects.