Event-related potentials (ERPs) and reaction time (RT) were recorded concurrently during the performance of six simple cognitive tasks for subjects (N = 30) who varied in mental ability as assessed by the Multidimensional Aptitude Battery (MAB). Results showing negative relationships between reaction time measures and mental ability were consistent with previous findings (Vernon, 1983). For the first stimulus in paired stimuli tasks, both P300 amplitude and latency were affected by task difficulty. Mental ability group differences were noted for P300 amplitude only. For the target stimulus, P300 latency increased with increasing task difficulty in the same manner as reaction time and it was inversely related to mental ability, in particular for the more difficult tasks. P300 amplitude varied between tasks, but was not related to mental ability. First unrotated factors were extracted from the intercorrelations of each variable. Results showed that each factor accounted for considerable variance. Correlations between factor scores revealed significant negative relationships between intelligence and P300 measures and between RT and P300 amplitude. Five predictor variables produced a multiple correlation of.583 with IQ. Results suggest that P300 latency and reaction time may assess respectively the stimulus evaluation time and response production time components of cognitive information processing that vary inversely with general intelligence.
| Identifer | oai:union.ndltd.org:uottawa.ca/oai:ruor.uottawa.ca:10393/6503 |
| Date | January 1993 |
| Creators | McGarry-Roberts, Patricia. |
| Contributors | Stelmack, Robert, |
| Publisher | University of Ottawa (Canada) |
| Source Sets | Université d’Ottawa |
| Detected Language | English |
| Type | Thesis |
| Format | 268 p. |
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