Effects of noise on cognitive processes of individuals in a laboratory experiment.

The effects of noise on information processing in perceptual and memory tasks, as well as time reaction to perceptual stimuli, were investigated in a laboratory experiment. Performance and heart rate in Information Processing Test, Simple and Choice Reaction Time tests and Stroop's test were evaluated at three levels of noise (silence, 75 dBA, 95 dBA). Individual noise sensitivity and noise-induced temporary threshold shift (NITTS) were also assessed. The results show that neither noise nor individual noise sensitivity, or NITTS, as separate factors have an influence on information processing and time reaction to perceptual stimuli. However, noise effects simple reaction time in interaction with individual noise sensitivity, and information processing--within experimental session duration. Experimental session duration was the one separate factor affecting information processing. Noise as a separate factor does not have an influence on task performance, however, it affects heart rate. The higher increase of noise-induced temporary threshold shift, the smaller the number of heart beats/minute was found.