Abstract: The brain stem auditory responses (BSR) of 31 subjects with normalhearing were recorded. 21 were asked to calculate multiplication. 16 wereasked to listen attentively to clicks and also estimate trigering times simul-taneously by recording. In the calculating group, BSR of 16 subjects had adecreased amplitude of wave Ⅰ in comparison with that of the calm subjects.BSR of 20 subjects had a positive wave with a 10--14msec latency. Noincreased amplituds of wave Ⅰ was observed in this group. In the second group, no decreased amplitude of wave Ⅰ was observed. Onthe contrary, the amplitude of wave Ⅰ of 4 subjects increased. The resultsindicate that BSR are affected by psycho-loads, in which negative and positivefeedback to the receptors may play a role, the former being predominant.

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