VISUAL-MOTOR PERFORMANCE DURING WHOLE-BODY VIBRATION

Abstract
Seven male employees of the Boeing Company were tested in the company's human vibration facility to determine the effect of whole body vibration on visual-motor performance. Six controls: a large and a small knob; a horizontal and a vertical lever; and a horizontal and a vertical thumbwheel were used to adjust a standard 3-inch dial indicator to a perscribed setting. Independent variables included variations in vibration frequency and severity, control force requirements and task complexity. Speed and accuracy of task accomplishments were recorded for each condition. A high work load condition, vibration independent of frequency and level, and control force requirements, , individually affected the speed and accuracy of operator adjustment. The type of control used did not influence accuracy, and had only minor influence on adjustment time with mounting position apparently producing the noted differences.

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