Abstract
Several studies on the combined effects of noise and vibration on psychomotor and cognitive performance are reviewed. Vibration presented alone and noise presented alone had no adverse effect on the cognitive task (mental calculation combined with short-term memory), while combined noise and vibration produced a slight increase in the number of errors. Studies in which a tracking task and two reaction-time tasks were used strongly suggest that whether noise adds to or subtracts from the effect produced by vibration depends to a large extent on the intensity level of the noise. Noise of 100 dB and 105 dB presented in combination with vibration at intensities of 0.1 gz (peak) and 0.3 gz (peak) produced subtractive effects while noise at 110 dB with vibration at 0.1 gz (peak) and 0.25 gz (peak) produced additive effects.
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