Oppositional children differ from healthy children in frontal brain activation.

An atypical EEG pattern of frontal brain activation, which has been found in children and adults with emotional disorders, also is hypothesized to be present in disruptive behavior disorders. One hundred nineteen children (4 1/2 and 8 years of age) were examined with regard to the following questions: (1) Do children who are diagnosed with oppositional defiant disorder (ODD) exhibit an atypical pattern of frontal brain activation? (2) Can this pattern be demonstrated in preschool children (4 1/2 years of age) as well as in school children (8 years)? (3) Are there gender differences in these patterns similar to those that have been demonstrated in adults? Spontaneous EEG activity was subjected to power spectral analysis. In oppositional preschool and elementary school girls, the well-known pattern of lower left frontal than right frontal activation emerged that has been found previously in emotionally disordered children. Healthy girls showed no frontal brain asymmetry at 4 1/2 years of age, and left frontal activation at 8 years. In contrast, healthy boys demonstrated a greater right than left frontal activation, whereas ODD boys did not display any frontal brain asymmetry. Thus, the pattern of frontal brain activation seems to be gender-specific. The atypical activation pattern in oppositional children is hypothesized to be a biological substrate of negative affective style.