Electromyographic Factors in Aircraft Control:Response and Adaption to Brief Noises of High Intensity

摘要

Tension effects of brief auditory stimuli in the range 100 to 117 db were examined in this experiment for their relation to stimulus intensity and repetition. Sixteen Ss were given four stimulus intensities four times each in counterbalanced order. Ss were instructed to remain as relaxed as possible.nThe tension response is about in proportion to the decibel level of the stimulus through this region. The increase is at a greater rate than that found at lower stimulus intensities and in¬dicates an overall acceleration of the function.nMean pre-stimulus tension decreases through the sitting. The tension increase called the b-response is absent under these conditions.nThe response to the brief noise stimulus shows a very pronounced decrease with rep¬etition.nComparing these results with those of other experiments it is concluded that:n1. The overall intensity response relation is probably curvilinear and positively accelerated.n2. The persistent effects of noise are prob¬ably a prolongation of the b-response.n3. An instructed movement to a stimulus ' following quickly after a tension reflex will "reinforce" that reflex and prevent it from adapting.nDecline in pre-stimulus tension level is gen¬eral in all experiments. Conditions affecting this level and its decline need further study.