A method is reported which purports to demonstrate objectively "thinking difficulties"; i. e., discrepancies between the general intellectual endowment and certain specific performances. It is hoped that this method can eventually be used to help to differentiate between "depressive" and schizophrenic reactions at an early stage.After describing the procedure, the results are presented in Table 1. Two typical case histories of the group showing a discrepancy are presented. It is pointed out that in combination with another psychobiological method a fair idea can be obtained of the depth involved in the disturbance.Abstract Teaser