Raven's Progressive Matrices and inspection time: P200 slope correlates

The chronometry of mental ability: An event-related potential analysis of an auditory oddball discrimination task

“…Caryl (1994) also reported correlations of ERP with mental ability that were in the expected direction, negative for IT and P200 latency and positive for P300 amplitude, but the correlations were not significant at the .05 level of confidence. Morris and Alcorn (1995) observed substantial relations between a slope measure of the N1-P2 wave across a range of IT exposure durations at frontal and temporal electrode sites. No amplitude or latency effects were reported.…”

Intelligence and inspection time: Achievements, prospects, and problems.

“…The most advanced of such approaches has been the effort to integrate scores from psychometric intelligence tests with both inspection time and evoked potential indexes. Analyses of participants' brain-evoked potentials while they performed the inspection-time task found that differences at about 140–200 ms after stimulus onset distinguish those who are superior on both inspection time and IQ tasks (Caryl, 1994; Colet, Piera, & Pueyo, 1993; Morris & Alcorn, 1995; Zhang, Caryl, & Deary, 1989a, 1989b). Participants who obtain higher scores on IQ-type tasks and those with faster inspection times tend to have a steeper evoked-potential slope as the negative deflection at about 100 ms after stimulus onset becomes a positive deflection at about 200 ms after stimulus onset.…”

“…Participants who obtain higher scores on IQ-type tasks and those with faster inspection times tend to have a steeper evoked-potential slope as the negative deflection at about 100 ms after stimulus onset becomes a positive deflection at about 200 ms after stimulus onset. This association is strongest at the frontal and temporo–occipital brain areas (Morris & Alcorn, 1995). It is a considerable advance to know that the brain's response during a narrow epoch of poststimulus activity is related to superior inspection time and psychometric intelligence test performance, and it is impressive that these findings have been replicated in three independent laboratories.…”

On the heritability of inspection time and its covariance with IQ: a twin study

“…From a reductionist approach, it is claimed that IT causes IQ and not the reverse; empirical efforts to substantiate this theory have focused on exemplifying IT as a biological mechanism. One demonstration of this was the association between IT and event-related potentials: faster ITs were characterised by steeper P200 slopes (the positive peak 200 ms after stimulus onset) and higher intelligence test scores (Morris & Alcorn, 1995).…”