title: Intelligence and inspection time in normal and mentally retarded subjects.
abstract: The present experiments explore the generality of some recent findings relating IQ to a measure known as Inspection Time (IT)--the exposure duration necessary to judge which of two briefly presented straight lines is the longer. In the first study IT and verbal and performance IQ scores were obtained from a large group of normal six- and seven-year-old children. In contrast to some previous suggestions verbal IQ and full-scale IQ did not correlate significantly with IT, and performance IQ showed only a weak correlation with IT (r = -0.29). In the second experiment IT was found to correlate much more highly with performance IQ in a sample of mentally retarded subjects (r = -0.71). Some possible implications of these results for theories of intelligence and of mental retardation are discussed.
mesh_terms: D000328:Adult; D001288:Attention; D002648:Child; D004193:Discrimination Learning; D005260:Female; D005556:Form Perception; D006801:Humans; D008607:Intellectual Disability / Q000523:psychology*; D007360:Intelligence; D008297:Male; D009949:Orientation; D011930:Reaction Time; D012858:Size Perception