![]() ![]() Interesting perceptual differences between SCHR stimuli challenge some of the basic premises of hearing science, such as the role of the magnitude and phase spectra of complex sounds. Schroeder-phase (SCHR) complexes are harmonic tone complexes with components having a phase relationship that results in a periodic frequency sweep (Schroeder, 1970). Furthermore, the high sensitivity observed in the inferior colliculus neural rate-based discrimination suggests that these neurons integrate across multiple inputs arising from the auditory periphery. However, correlations between neural d' values and behavioral sensitivity for sweep direction were strongest for both temporal metrics, for both auditory nerve and inferior colliculus. In the inferior colliculus, both temporal fine structure and envelope appear to be represented best by rate. Our results suggest that in the auditory nerve, stimulus fine structure is represented by spike timing, whereas envelope is represented by rate. Neural responses and behavioral performance were both expressed in terms of sensitivity, d', to allow direct comparisons. Temporal representation in neural responses based on the van Rossum spike-distance metric, with time constants of either 1 ms or related to the stimulus' period, was compared with average discharge rates. Gerbils were able to discriminate Schroeder-phase harmonic tone complexes based on sweep direction, duty cycle, and/or velocity for fundamental frequencies up to 200 Hz. Here, responses to a range of Schroeder-phase harmonic tone complexes were studied both behaviorally and in neural recordings from the auditory nerve and inferior colliculus of Mongolian gerbils. Each pitch period of the Schroeder stimulus contains a linear frequency sweep the duty cycle, sweep velocity, and direction are controlled by parameters of the phase spectrum. Is your product defective and the manual offers no solution? Go to a Repair Café for free repair services.Schroeder-phase harmonic tone complexes have been used in physiological and psychophysical studies in several species to gain insight into cochlear function. ![]() Is your model not on the list? Please contact us. Also view the frequenty asked questions at the bottom of the page for useful tips about your product. Below you can find all models Sennheiser Microphones for which we have manuals available. ![]()
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