During recent years auditory research has advanced quite rapidly in the area of experimental psychology as well as in that of physiology. Scientists working in both areas have in cornrnon the study of the process in HEARING, yet different scientific areas always tend to diverge. A SYMPOSIUM ON PSY CHOPHYSICAL MODELS AND PHYSIOLOGICAL FACTS IN HEARING was or ganized for the exchange of information and to stimulate dis cussion between research workers in psychoacoustics, neurophy siology, anatomy, morphology and hydromechanics. The basic aim of holding this syrnposium was to halt the divergence and to initiate the kind of multi-disciplinary research that will be need ed to elucidate the hearing process as a whole. The present proceedings comprise the papers, which were circulated to the participants two months before the syrnposium and discussed during the syrnposium, together with some cornrnents and additional re marks. These cornrnents and rernarks do not, however, represent the full discussions but only the parts available in written form. We have arranged the material in five sections: I. Structure and Neurobiology of the Inner Ear II. Cochlear Mechanisms III. Auditory Frequency Analysis IV. Auditory Time Analysis V. Nonlinear Effects Within the limits of a syrnposium, none of these topics could be treated comprehensively; moreover, most of the papers concerned problems having several aspects.
Table of ContentsI. Structure and Neurobiology of the Inner Ear.- Morphology of the walls of the cochlear duct.- Neuroanatomy of the cochlea.- Comments.- Neurobiology of hair cells and their synapses.- II. Cochlear Mechanisms.- Measurements of sound pressure in the cochleae of anesthetized cats.- Comments.- Basilar membrane data and their relation to theories of frequency analysis.- Comments.- The significance of shearing displacements for the mechanical stimulation of cochlear hair cells.- Comments.- Enlarged hydromechanical cochlea model with basilar membrane and tectorial membrane.- A model for mechanical to neural transduction in J.L. HALL the auditory receptor.- Comments.- A “second filter” established within the scala media (General Comment).- An alternative approach to the second filter (General Comment).- III. Auditory Frequency Analysis.- Neuro-mechanical frequency analysis in the cochlea.- Auditory frequency selectivity and the cochlear nerve.- Comments.- On a psychoacoustical equivalent of tuning curves.- Pure-tone masking; a new result from a new method.- Frequency selectivity and the tonal residue.- Frequency discrimination at the threshold.- Monotic and dichotic pitch matchings with complex sounds.- Comments.- IV. Auditory Time Analysis.- Recordings from spiral ganglion neurons.- Comments.- Coding of repetition noise in the cochlear nucleus in cat.- Comments.- Comments.- Information processing in the higher parts of the auditory pathway.- Dynamic properties of cochlear nucleus units in response to excitory and inhibitory tones.- Roughness and its relation to the time-pattern of psychoacoustical excitation.- Transient masking pattern of narrow band maskers.- Masking patterns and lateral inhibition.- Comments.- The slopes of masking patterns (General Comments).- Comments.- A crude quantitative theory of backward masking.- V. Nonlinear Effects.- Nonlinear effects in the transient response of the basilar membrane.- Nonlinear mechanisms and cochlear selectivity.- Cochlear microphonic correlates of cubic difference tones.- The representation of tones and combination tones in spike discharge patterns of single cochlear nerve fibers.- On the mechanisms of combination tone generation and lateral inhibition in hearing.- Comments.- Subjective phase effects and combination tones.- Pitch of pure tones: its relation to intensity.