PubMed Health⌕ Search

SEARCH · PubMed Health

Results for “Sound Localization”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 109 records · Page 6Linked to original sources
PubMed1986

Sound localization of frequency-modulated sinusoids by Old World monkeys.

Directional hearing acuity, as measured by the minimum audible angle (MAA), was determined in four Old World monkeys, Macaca radiata. The acoustic stimuli were linear changes in frequency (sweeps) for different frequency ranges and sweep rates. The sweeps ranged between 0.5 and 1.3 kHz, at two durations, 100 and 200 ms. In upsweeps which began at 0.5 kHz and were 200 ms in duration, MAA decreased as sweep rate and frequency range increased. These thresholds were compared to MAAs of sweeps which traversed the same range of frequencies but at a different rate, to MAAs of sweeps with identical rates but over different frequency ranges, and to the MAAs of downsweeps. These comparisons indicated that range, and not sweep rate, exerts the greatest effect on the MAA. Interaural phase differences derived from the upper limits of the frequency range are discussed as potential FM localization cues.

Acoustic Stimulation↗
PubMed1979

Response of cat inferior colliculus neurons to binaural beat stimuli: possible mechanisms for sound localization.

The interaural phase sensitivity of neurons was studied through the use of binaural beat stimuli. The response of most cells was phase-locked to the beat frequency, which provides a possible neural correlate to the human sensation of binaural beats. In addition, this stimulus allowed the direction and rate of interaural phase change to be varied. Some neurons in our sample responded selectively to manipulations of these two variables, which suggests a sensitivity to direction or speed of movement.

Animals↗
PubMed1990

Active localization of virtual sounds.

A simple virtual sound display built around a microcomputer and analog hardware is described. The display implements most of the primary cues for sound localization in the ear-level plane. Judging both from informal observations by users and from objective data obtained in an experiment on homing to virtual and real sounds, it is concluded that simple displays like the one described are effective in creating the impression of external sounds to which observers can locomote with ease; in particular, this means that simulation of the direction-dependent spectral shaping effects of the pinnae is not a necessary requirement for extracranial sound localization.

Adult↗
PubMed1990

Vestigial hearing in a fossorial mammal, the pocket gopher (Geomys bursarius).

Behavioral tests of hearing and sound localization in the North American pocket gopher (Geomys bursarius) show that it is unique among mammals. It has a severely attenuated range of hearing and only rudimentary ability to localize sound. In these respects, the hearing of gophers can be properly termed 'vestigial' and suggests that life underground can produce as severe a change in hearing as a light-less world produces in vision or an odorless world produces in olfaction.

Acoustic Stimulation↗
PubMedDate not supplied

The effects of aging on neuron number in the rat superior olivary complex.

The superior olivary complex (SOC) is an auditory center in the brainstem involved in the processing of binaural information. The ability to localize sounds is dependent on the efficient processing of binaural signals by the SOC and other auditory centers. It has been demonstrated that sound localization ability is impaired in aged rats, and morphological changes in the SOC may contribute to this deficit. In the present study, neuron counts were done on three key nuclei of the SOC: the medial nucleus of the trapezoid body (MNTB), the lateral superior olivary nucleus (LSO), and the medial superior olivary nucleus (MSO) in groups of Fischer 344 rats aged 3, 12, 24, and 30 months. Neuron number remains stable between 3 and 30 months of age in the LSO and MSO, however, in the MNTB, neuron number is significantly reduced at 24 and 30 months of age. Neuron loss in the MNTB of 24-month-old Fischer 344 rats is not as heavy as that reported earlier in 24-month-old Sprague-Dawley rats (8% loss versus 34% loss), indicating a strain difference with regard to aging in the SOC.

Aging↗