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SUMMARYThe Authors have studied 56 twin pairs (31 MZ and 25 DZ) under the aspect of the psychomotor reactions they have shown while watching motion pictures. The most closely considered reactions have been head posture, arm and leg posture and mimic reactions. The analysis of the reactions was carried out on photographs taken during the projection of the films and then compared for the degree of similarity of the postural or mymical reactions. The degree of similarity was rated according to the following scale: concordant, similar, dissimilar, discordant.The results obtained have shown that head posture (on which the influence of conscious mobility is higher) the hereditary factors have a clear influence; while for arm posture and especially for leg posture during projection the influence of hereditary factors could not be proven in any appreciable degree; this finding is thought to be related to the low influence of conscious mobility and with the sitting position being conditioned by environmental factors.For mimic reactions the influence of a hereditary component is always clear, but from this point of view a marked difference is found between mimic reactions to anxiogenous and to comical films. Reactions to the latter reveal a higher, characteristic degree of difference between MZ and DZ twin pairs, i. e. a higher degree of hereditary influence.The Authors have made further studies on the family trees under the aspects of previous twinnings and of previous personal pathological anamnesis, increasing the known case histories and strenghtening the conclusions reached by Gedda in previous studies.