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Proceedings of the Physiological Society, 18 January 1964, Royal College of Surgeons Meeting: Communications

and the latter observation indicates that the changes in threshold are central and not peripheral in origin. In another series of experiments, ten subjects were conditioned for 60 sec at each of 10, 20, 40, 60 and 80 c/s before measurements of thresholds. Fig. 1 shows the means of ascending thresholds (solid line) and means of descending thresholds (broken line) for each conditioning frequency. The two lines show a steep rise between 20 and 40 c/s. Increase of conditioning frequency to 60 or 80 c/s is followed by a lesser increase in mean ascending threshold and little variation in mean descending threshold. The rise in threshold of fusion (the 'neutral point') with increase of frequency of the conditioning stimulus accords with the postulate of Helson (1948) that, as with other sensory modalities, the 'neutral point' tends to move towards the value of the conditioning stimulus.