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Abstract

The influence of cognitive and affective information processing on the late positive complex of the event-related potential was studied by means of structural or affective processing of adjectives categorized as emotionally negative, neutral or positive. An extensive replication study tested 2 research hypotheses derived from a pilot study with 14 subjects. The first hypothesis stated that the active, conscious evaluation of the affective meaning of the adjectives should lead to a long lasting positive shift, which is maximal over the frontal scalp. This shift should be independent of the emotional content of the adjectives and should not be observed during structural processing. Second, the emotionally negative and emotionally positive adjectives should elicit a more positive P3-component compared to neutral adjectives. This effect should be independent of the type of task (structural or affective). Because the hypotheses are in part related to the interpretation of the null hypotheses of the statistical tests, an a priori control of both alpha- and beta-error probability is necessary. - From the results, it is concluded that affect and cognition are separate information processing functions of the brain and are mediated by different brain systems