1976 — 1979 |
Hartmann, William |
N/AActivity Code Description: No activity code was retrieved: click on the grant title for more information |
Temporal Effects in Human Pitch Perception @ Michigan State University |
0.915 |
1979 — 1982 |
Hartmann, William |
N/AActivity Code Description: No activity code was retrieved: click on the grant title for more information |
Human Pitch Perception For Sine Tones @ Michigan State University |
0.915 |
1985 — 1988 |
Hartmann, William M |
R01Activity Code Description: To support a discrete, specified, circumscribed project to be performed by the named investigator(s) in an area representing his or her specific interest and competencies. |
Human Pitch Perception &Auditory Neural Pattern Theory @ Michigan State University
Because pitch is the most acute of all human auditory percepts, pitch perception experiments are stringent tests of neurophysiological models of the human auditory system. in this project three programs in human pitch perception are proposed to test or to develop models of auditory neural patterns. (1) Experiments on pitch discrimination for short tones of unequal duration challenge the existing neurophysiological interpretations of the perception of impulsive tones. The development of an alternative statistical decision theory model is suggested. (2) Experiments on the formation of pitch by manipulation of the mutual coherence of signals delivered to the two ears reveal similarities and differences when compared to binaural pitch effects resulting from manipulation of the interaural phase. The results can be used to refain models of binaural interaction and theories of central neural patterns. (3) Experiments on the ability to isolate the pitch of a mistuned component in a complex tone probe the limits of auditory temporal analysis. The data provide tests of the descriptions of the role which neural synchrony plays in percepturally segrating different sources of sound. Together these three research programs will develop new knowledge, with potential clinical significance. Concerning auditory neural excitation patterns. Specifically this knowledge can help to refine the distinctions between those kinds of hearing deficits which can be treated successfully at the auditory periphery and those which cannot.
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1 |
1985 — 1987 |
Hartmann, William |
N/AActivity Code Description: No activity code was retrieved: click on the grant title for more information |
U.S.-France Cooperative Research: Perception of Incoherent Tones @ Michigan State University |
0.915 |
1986 |
Hartmann, William M |
R13Activity Code Description: To support recipient sponsored and directed international, national or regional meetings, conferences and workshops. |
Special Session On Human Pitch Perception @ Michigan State University
A special session of invited papers entitled, "Psychoacoustics and Physiology of Pitch Perception and Frequency Discrimination," is planned for the meeting of the Acoustical Society of America in Cleveland, Ohio, 12-16 May 1986. There will be six speakers who are specialists in this area, three from the United States and three from Europe. There are two purposes to the special session: (1) to establish a set of alternative directions for future research in pitch perception; (2) to inform psychologists and physiologists, who study the auditory system but who are not specialists in pitch perception, about the current state of pitch perception research so that they may recognize pitch-relevant features in their own experimental data and interpretations. The special session will deal with both the psychoacoustics and the physiology connected with the pitch of sine tones (tonotopically local) of noise and clicks (tonotopically broad) and of complex tones (the elements of speech vowel sounds and music). The work to be presented involves fundamental questions of place and time coding in the peripheral auditory system, questions which are of considerable significance for the encoding of signals in hearing prostheses.
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1 |
1989 — 1990 |
Hartmann, William M |
R01Activity Code Description: To support a discrete, specified, circumscribed project to be performed by the named investigator(s) in an area representing his or her specific interest and competencies. |
Human Hearing - Neural Models of Pitch and Location @ Michigan State University
One of the first observations that we can make about the human auditory system is that we have two ears. Signals sent from the seperate ears to the brain are combined in two different ways. There is a summing mode, in which information from the two ears in combined so that sounds are louder, and fine distinctions of pitch and information content can be made better, with two ears than with one. There is also a differential mode, in which the information from the two ears is compared. It is this mode which is primarily responsible for our ability to locate sounds in space. This grant application proposes psychological experimental studies of the differential mode. Such studies are timely because in recent years physiologist have worked their way up from the periphery to more central parts of the mammalian auditory system where binaural differences are processed. There is an opportunity to unify the information from these physiological studies with the psychology of two-eared, or binaural, perception. An important goal of these studies is to understand how human listeners can locate sounds in a reflective environment, where they are exposed to a barrage of echos coming from all directions. One step involved here is first to gain a better understanding of the inputs to the ears, by measuring eardrum vibrations with reflected laser light. A second goal is to understand the acoustical difference between sounds which seem to the listener to come from outside and sounds which seem to be located within the head, as often happens with headphone listening. A powerful psychological technique for studying details of the binaural system is obtained from binaural pitch effects. Binaural pitches are those which cannot be heard with one ear alone. They are created in the brain only by combining inputs from both ears.
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1 |
1991 — 1993 |
Hartmann, William M |
R01Activity Code Description: To support a discrete, specified, circumscribed project to be performed by the named investigator(s) in an area representing his or her specific interest and competencies. |
Human Hearing-Models of Pitch and Location @ Michigan State University
DESCRIPTION: (Adapted from the Applicant's Abstract.) The projects in this application test ideas about the way that human listeners localize sounds. Particularly, these projects test the idea that sources in the median vertical plan (MVP) are localized on the basis of spectral cues such as direction bands. An elementary test is to study MVP localization using signals of different spectral distribution to find the kinds of linear distortions that cause listeners to make errors. Also, the idea of spectrally-based localization has implications for the precedence effect: In sharp contrast to localization in the horizontal plane, localization based upon direction bands should show no precedence effect for ongoing broad-band noise. Again, unlike azimuthal localization, spectrally-based localization should not be changed if reflections from a ceiling are substituted for reflections from a floor. The time constants for the precedence effect for spectrally-based localization can be measured in several different ways, and if the fundamental ideas are correct then these measurements should agree. A model of localization based upon direction bands also requires rules about how cues from different spectral regions are combined. In some cases different spectral bands, heard simultaneously, are perceived as separate sources. In other cases, the bands are combined to create a fused source image. It is also important to know how information from vertical localization is combined with information on localization in the horizontal plane to create an image in three dimensions. Experiments proposed in this application address all those predictions and questions. Other experiments, on localization in the horizontal plane, are designed to solve measurement problems, specifically understanding the effects on localization and on source identification that occur when the range of sources and the range of response options is
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1995 — 2008 |
Hartmann, William M |
R01Activity Code Description: To support a discrete, specified, circumscribed project to be performed by the named investigator(s) in an area representing his or her specific interest and competencies. |
Localization of Sound by Human Listeners @ Michigan State University
at the top of each printed page and each continuation page. RESEARCH GRANT TABLE OF CONTENTS Page Numbers Face Page 1 Description,
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