Background: Previous twin studies have supported a genetic contribution to the major categories of psychotic disorders, but few of these have employed operational diagnostic criteria, and no such study has been based on a sample that included the full range of functional psychotic disorders.

The Tridimensional Personality Questionnaire results support a role of the serotonergic system in both migraine and tension-type headache pathophysiology. A dysfunction of dopaminergic and glutaminergic tone seems to be a specific feature of migraine.

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The results seem to confirm the hypothesis that obstetric complications may contribute to increased vulnerability to the disease, in addition to genetic risk factors.

To assess the relationship between hemispheric differences in information processing and interhemispheric asymmetries in terms of brain bioelectrical activity, we correlated scores on the MMPI Depression scale with interhemispheric asymmetry, measured as peak amplitude and latency of the P3 component of somatosensory evoked potentials (SEPs) at the frontocortical region of 14 healthy unselected volunteers (8 men and 6 women) who were about to start a course in autogenic training. The sample was subdivided into two groups on the basis of the median score on the MMPI Depression scale. Subjects scoring above the median showed a right lateralization at the frontocentral region and a significantly shorter P3 latency at the right hemisphere compared to the left.