The string measure of the ERP: What does it measure?

Author(s): Nettelbeck, T., Cooper, C. J.

Journal/Book: Int J Psychophysiol. 1997; 27: PO Box 211, 1000 AE Amsterdam, Netherlands. Elsevier Science BV. 43-53.

Abstract: The event-related brain potential (ERP) has been investigated extensively inan effort to understand the neurophysiological bases of intelligence. Measures derived from the ERP have been used as indices of intelligence, particularly the string measure of the complexity of the ERP. However, the string measure has been criticised for being non-specific and for being dependent on ERP amplitude. These criticisms were tested by investigating relationships between ERP string measure, ERP amplitude measures, and the ERP power spectrum. It was found that the string measure was non-specific in that it indexes both low and high frequency event-related activity; the string measure is also dependent on ERP amplitude. The string measure is therefore not a valid measure of the ERP. It was concluded that the string measure should be abandoned; human intelligence cannot map in a simple way onto gross measures of scalp-recorded electrocortical activity.

Note: Article Burns NR, Univ Adelaide, Dept Psychol, Adelaide, SA 5005, AUSTRALIA

Keyword(s): event-related potentials; intelligence; inspection time; string measure; ERP power spectrum; backward pattern masking; VISUAL-EVOKED-POTENTIALS; EVENT-RELATED POTENTIALS; PSYCHOMETRIC INTELLIGENCE; INSPECTION TIME; BRAIN; LENGTH; IQ; PERFORMANCE; TESTS; EEG

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