In several previous studies it has been shown that the mean tremor amplitude displayed by morbidly anxious patients is greater than that of normal control subjects. The most detailed experiments were those carried out by Redfearn (1957). He compared the findings obtained in groups of male morbidly anxious patients and controls, and in addition to confirming the existence of a difference in tremor amplitude, he reported that the tremor of male anxious patients showed a greater degree of accentuation of the 8–10 c/sec. components than the tremor of a matched control group. Halliday and Redfearn (1956) compared the tremor spectra obtained from normal male and female subjects, and found that the curve for men was similar to that for women.