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Raven's matrices and inspection time (IT) were recorded from 56 subjects under five arousal levels. Raven's and IT correlated strongly (r=-.7) as predicted by processing-speed theories of g. In line with Eysenck's [Eysenck, H. J. (1967). The biological basis of personality. Springfield, IL: Thomas] arousal theory of extraversion, there was a significant inverted U relationship between Raven's scores...
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