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The"Memory-Reaction Time Task" provides reaction time (RT) measures which are linearly related to memory 10ad. The intercept of the RT function represents the time required for input and output processes, and the slope is an index of central processing time. Three experiments were conducted, using vertical vibration of seated subjects, in an attempt to separate mechanical interference effects on peripheral processes from generalized stress effects on central processes. Experiments I and II investigated the effects of vibration intensity and the size of the visually displayed task materials, during short duration exposures (3~ min). The intercept of the RT function increased significantly as the intensity of vibration increased. Interference with the input of visual information was responsible for this effect, since it only occurred with the smallest of the three display sizes used. In Experiment III, the largest display was used to eliminate visual interference, and the vibration exposure was lengthened to 41 min to increase the possibility of generalized stress effects. Under these conditions no significant effects were produced on performance of the task. These experiments indicate that performance of the type represented by this task is susceptible to mechanical interference with peripheral processes, but is essentially immune to any central processing effects from the general stress of the vibration.
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