Deutsch S
Department of Electrical Engineering, University of South Florida, Tampa, FL 33620.
IEEE Trans Biomed Eng. 1990 Jun;37(6):556-64. doi: 10.1109/10.55659.
There are two schools of thought with regard to how the auditory central processor achieves good frequency resolution. The first is based on the steep 300 dB/oct rolloff; the second on the fact that the action potential (AP) output of neurons associated with hair cells is partially synchronized to the incoming fin or its subharmonics. The main objection to this proposal is that synchronization seems to fail for high-frequency audio inputs. It is shown that this failure may be due to experimental difficulties. It is impossible to avoid trauma to the cochlea and/or auditory nerve. To study synchronization at 10,000 Hz, the interspike-interval (ISI) histogram requires a timing accuracy of 4 microseconds or better despite input AP's that have a rise time of 200 microseconds. Synthetic AP ISI histograms are derived for a) unstimulated; b) fully synchronized; c) low-frequency; and d) high-frequency audio input conditions. The latter are compared with typical experimentally derived data. Hypothetical processing by reverberatory neurons is also considered.
关于听觉中枢处理器如何实现良好的频率分辨率，存在两种观点。第一种基于陡峭的300分贝/倍频程滚降；第二种基于与毛细胞相关的神经元的动作电位（AP）输出部分与传入的频率或其分谐波同步这一事实。对该提议的主要反对意见是，对于高频音频输入，同步似乎会失效。结果表明，这种失效可能是由于实验困难。避免对耳蜗和/或听神经造成损伤是不可能的。为了研究10000赫兹时的同步情况，尽管输入的动作电位上升时间为200微秒，但峰峰间隔（ISI）直方图仍需要4微秒或更高的定时精度。针对以下情况推导了合成的动作电位峰峰间隔直方图：a）未受刺激；b）完全同步；c）低频；d）高频音频输入条件。将后者与典型的实验得出的数据进行比较。还考虑了回响神经元的假设处理。
