key on the keyboard when the signal generated by the event marker first appears. Thus the auditory system and auditory gain are capable of adapting both suddenly and gradually. Note that the overall path length of the auditory pathway is relatively. ends with the tympanic membrane (EARDRUM) The auditory canal functions as RESONATOR (amplifying the incoming signal). Studies on hearing loss have found other features of the auditory system take months to adapt (Syka 2002). The signal is then passed to the cochlear branch of cranial nerve VIII (CN VIII). The structure of the control path is carefully designed to reflect the active cochlear process of the corresponding local basilar-membrane site as well as that of neighboring sites. The ability of this model to process arbitrary sound inputs makes it a useful tool for studying peripheral auditory processing. Some portions of the auditory system adapt to signal changes within 160ms while others take only 10s of seconds to adapt (Dean 2008). Auditory Pathway Vestibular Pathway Clinical Relevance References. As the level of the input signal to the control path increases, then the value of decreases, thus increasing the filter’s bandwidth and decreasing its gain. The incorporation of both the level-independent frequency glide and the level-dependent compressive nonlinearity into a phenomenological model for the AN was the primary focus of this work. In addition, this model has other important properties, such as nonlinear compression, two-tone suppression, and reasonable Q10 values for tuning curves. The pole locations were continuously varied as a function of time by the control signal to change the gain and bandwidth of the signal path, but the instantaneous frequency profile in the revcor function was independent of sound pressure level, consistent with physiological data. These then lead to the cochlear nucleus, then to the superior olive, then to the inferior colliculus, then to the medial geniculate. These synapse on spiking neurons in the spiral ganglia, the axons of which form the auditory (8th cranial) nerve. Instantaneous frequency glides in the reverse-correlation (revcor) function of the model's response to broadband noise were achieved by carefully restricting the locations of the poles and zeros of the bandpass filter. The primary auditory pathway begins with the auditory receptors in the cochlea. This model produced realistic response features to several stimuli, including pure tones, two-tone combinations, wideband noise, and clicks. The model's signal path consisted of a time-varying bandpass filter the bandwidth and gain of the signal path were controlled by a nonlinear feed-forward control path. A computational model was developed to simulate the responses of auditory-nerve (AN) fibers in cat.
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