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This monograph details Bustamente's experience with Mira's Myokinetic Psychodiagnostic Test on five hundred Cuban subjects, including four hundred five psychiatric patients and ninety-five controls. It is a test of unsupported movements in space, and involves also spatial kinesthetic perception. The subject is required to draw several figures, first openly tracing, and then blindly retracing these figures, including lines, zig-zags, chains, stairs, etc., in three planes of space—horizontal, vertical, and sagittal. Some of the figures are drawn with both hands, and the direction of drawing is modified in various ways. It is essential that the arm, hand, and wrist be unsupported to get a free myokinetic performance, involving the whole extremity. These drawings are scored as to variations in size, shape, deviation from the axis and underlying printed figure, but an evaluation of the subject's extragraphic behavior in the test is also included. There is some discussion of the theoretical basis which includes the consideration that motor performance is closely correlated to the subject's mental state as well as characterological traits. Following Werner Wolff, the dominant limb is subject to a process of continual training and inhibition, whereas the nondominant limb is left untrained. The former is correlated with consciousness, gross inhibition, as well as training; the latter with the unconscious, less inhibition, and since there is less training, the individual's constitutional endowment. It is claimed that the lack of verbalization leads to more objectivity than other tests. Typical findings in various clinical psychiatric entities are given, compared to Mira's own findings with a high degree of correspondence. An example of how a finding is derived is that in a paranoid individual there is found an increased forward thrust in the sagittal plane, which is taken as an index of extensive predominance over flexor, and is supposed to be correlated with the i