A series of 20 patients suffering from migraine were submitted to a battery of tests. The results of two Intelligence tests, Matrices and Wechsler-Bellevue scale, and of the Rorschach test were discussed. Matrices and Wechsler-Bellevue scale were found to agree reasonably well. The I.Q. distribution showed that migraine was not confined to people who are intellectually above average, but that its incidence might increase in the higher I.Q. ranges. The results of the Wechsler-Bellevue test were compared with those of a control group and it appeared that, on the whole, the migraine group functioned well intellectually. The Rorschach test results were compared with those of a group of duodenal ulcer patients. The migraine group showed itself better adjusted. No uniform personality pattern was found for the whole group. Four patients showed features which might be termed hysterical. Rorschach signs which are usually taken to denote an obsessional personality make-up were not greatly in evidence. For the majority within the migraine group the emotional life seemed to be under rational control. The main inferences were that there was a striving to remain in command of a situation and that loss of command and interference with rhythm resulted in tension which might, conceivably, be resolved in a migraine attack.