[The influence of centrally acting drugs on flicker fusion frequency]

From the research results given we may conclude that the flicker fusion frequency is reduced not only by tranquillisers but also by neuroleptic drugs. The records obtained of the effect of the dosage can be seen as a measure of the efficiency of this method. It should be established by means of similar experiments, by including additional substances, in which regions of the cortico-retinal system the site of action should be presumed to be.