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Visual Effects on Finger Tremor in Normal Subjects and Anxious Patients

  • J. R. G. Carrie (a1)

Extract

Sutton and Sykes (1956) studied the characteristics of the tremor superimposed on a voluntary muscular contraction under two conditions; (a) when the subjects were provided with a visual display of the accuracy with which they were maintaining a constant force, and (b) when they carried out the same task with the eyes closed. It was observed that when the subjects' eyes were closed, the tremor amplitude at 8–9 c/s (cycles per second) was sometimes relatively much diminished. In some subjects there was evidence of a smaller reduction in amplitude at other frequencies. Young (1933) had made similar findings using a less satisfactory technique. The findings of these workers have been confirmed and extended in another investigation (Carrie, 1965).

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Brumlik, J. (1962). “On the nature of normal tremor.” Neurology (Minneap.), 12, 159179.
Carrie, J. R. G. (1965). “Finger tremor with an amplified visual display of position and following eyeclosure.” J. neurol. Sci. (In press).
Halliday, A. M., and Redfearn, J. W. T. (1956). “An analysis of the frequencies of finger tremor in healthy subjects.” J. Physiol., 134, 600611.
Halliday, A. M., and Redfearn, J. W. T. (1958). “Finger tremor in tabetic patients and its bearing on the mechanism producing the rhythm of physiological tremor.” J. Neurol. Neurosurg. Psychiat., 21, 101108.
Lippold, O. C. J., Redfearn, J. W. T., and Vuco, J. (1959). “The frequency analysis of tremor in normal and thyrotoxic subjects.” Clin. Sci., 18, 587595.
Malmo, R. B., Shagass, C., and Davis, J. F. (1951). “Electromyographic studies of muscular tension in psychiatric patients under stress.” J. clin. exp. Psychopath., 12, 4566.
Marshall, J., and Walsh, E. G. (1956). “Physiological tremor.” J. Neurol. Neurosurg. Psychiat., 19, 3335.
Redfearn, J. W. T. (1957). “Normal and neurotic tremors.” J. Neurol. Neurosurg. Psychiat., 20, 302313.
Sutton, G. G. (1956). “A preliminary note on the relationship between total error in maintaining a fixed force and the magnitude of the force.” Statistical Advisory Unit Report, 4/58. pp. 2527. Ministry of Aviation Library, London.
Sutton, G. G., and Sykes, K. (1956). “The reduction of hand tremor by removal of visual stimulus.” Statistical Advisory Unit Report 4/58. pp. 2836. Ministry of Aviation Library, London.
Van Buskirk, C., and Fink, R. A. (1962). “Physiologic tremor—an experimental study.” Neurology (Minneap.), 12, 361370.
Wachs, H. (1964). “Studies of physiologic tremor in the dog.” Neurology (Minneap.), 14, 5061.
Young, I. C. (1933). “A study of tremor in normal subjects.” J. exptl. Psychol., 16, 644656.

Visual Effects on Finger Tremor in Normal Subjects and Anxious Patients

  • J. R. G. Carrie (a1)

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Visual Effects on Finger Tremor in Normal Subjects and Anxious Patients

  • J. R. G. Carrie (a1)
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