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在强噪声暴露后豚鼠听皮层对纯音调频的诱发电位振幅增大,对多数载波频率及在多数情况下调频诱发反应阈(△F_m)则明显地降低。以反应阈降低的全部数据计算,暴露后△F_m平均约降至暴露前的一半,在少数例子中降至暴露前的1/5,甚至更低。噪声暴露后诱发电位振幅的增大可以认为是由噪声引起的皮层活动某种易化的表现△F_m的降低则倾向于提示,此种皮层易化反映暂时的功能变化,它使听觉分辨暂时得到改善。
After strong noise exposure, the evoked potential amplitude of pure tone tone increased in the auditory cortex of guinea pigs, and decreased significantly for most carrier frequencies and in most cases FM induced response threshold (ΔF_m). Calculated from all the data on the reduction of response threshold, the average value of ΔF_m after exposure decreased to about half of that before exposure, and in a few cases to 1/5 or even lower before exposure. The increase in evoked potential amplitude after noise exposure may be considered as a facilitation of cortical activity due to noise. A decrease in ΔF_m tends to suggest that this cortical facilitation reflects temporary functional changes that temporarily allow auditory resolution improve.