Adaptation of perceived depth related to changes of the effective interpupuillary distance in computer-graphic steroscopic displays

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.Includes bibliographical references (p. 260-268).by David Walter Schloerb.Ph.D

Reports to the President

A compilation of annual reports for the 1985-1986 academic year, including a report from the President of the Massachusetts Institute of Technology, as well as reports from the academic and administrative units of the Institute. The reports outline the year's goals, accomplishments, honors and awards, and future plans

Mechanisms for Coding Pitch

University of Minnesota Ph.D. dissertation. May 2018. Major: Psychology. Advisor: Andrew Oxenham. 1 computer file (PDF); ix, 204 pages.Pitch, the perceptual correlate of a sound’s frequency, is a fundamental attribute in speech and melody perception. We utilized individual differences across listeners with normal and disordered hearing to better understand how pitch is represented in the auditory system. Results from young, normal hearing listeners and listeners varying in age suggested the bulk of variability in sensitivity to modulations in frequency (FM) and amplitude (AM) likely reflects central, rather than peripheral, limitations. For listeners varying in degree of sensorineural hearing loss, however, sensitivity to FM was directly related to the fidelity of tonotopic (place) coding within the cochlea. This was contrary to the widely accepted understanding that FM is represented by precise, phase-locked spike times in the auditory nerve. To test the role of central processes on pitch perception, several experiments were conducted on listeners with congenital amusia, a neurogenetic disorder characterized by poor fine-grained pitch perception, unrelated to peripheral coding. We found that amusic deficits extend beyond poor pitch discrimination, including poor discrimination for high frequencies as well as poor detection for FM and AM tones. Despite the long-held understanding that amusia is a life-long deficit for pitch and music, impervious to training, we found rapid learning for pitch and melody discrimination in amusia. The learning effects were large and maintained for at least one-year. Overall, the findings suggest peripheral place coding is important for the fidelity of pitch, but many processes beyond the periphery can also contribute to variability in pitch perception

Reports to the President

A compilation of annual reports for the 1990-1991 academic year, including a report from the President of the Massachusetts Institute of Technology, as well as reports from the academic and administrative units of the Institute. The reports outline the year's goals, accomplishments, honors and awards, and future plans