Difference thresholds for interaural intensity

Hafter, Ervin R.; Dye, Raymond H.; Neutzel, J.; Aronow, H.

doi:10.1121/1.381372

Cited by 35 publications

(23 citation statements)

References 13 publications

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“…Moreover, the best-threshold ILDs of most neurons occurred near the midline, for pedestal ILDs between ϩ5 and Ϫ5 of 0 dB. The low-threshold ILDs Ͻ1 dB near pedestals of 0 dB are consistent with psychophysical findings of best acuity for ILD (Hafter et al, 1977;Yost and Dye, 1988) and azimuth (Mills, 1958).…”

Section: Discussionsupporting

confidence: 75%

“…Yost and Dye (1988) also report thresholds at midline (ILD, 0 dB) ranged from 0.6 to 1.2 dB (depending on frequency), which is comparable with the 0.9 dB (value of the lower envelope at 0 dB ILD) threshold ILD found here. Hafter et al (1977) found thresholds of ϳ1.5 dB at midline. Recall that low neural threshold ILDs were found across a broad range of neural CFs and, thus, stimulus frequencies (Fig.…”

Section: Ild Thresholds As Function Of Pedestal Ildmentioning

confidence: 99%

“…Hafter et al (1977), using short-duration bandpass stimuli, reported human ILD thresholds that increased with pedestal ILD by ϳ0.03 dB/dB over a 24 dB range of pedestal ILDs. The data from Yost and Dye (1988) and Hafter et al (1977) are comparable with the neural data in that the range of bestthreshold ILDs, as reflected by the lower envelope (Fig. 3A), show only a small dependence on the pedestal ILD.…”

Section: Ild Thresholds As Function Of Pedestal Ildmentioning

confidence: 99%

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Interaural Level Difference Discrimination Thresholds for Single Neurons in the Lateral Superior Olive

Tollin¹,

Koka²,

Tsai³

2008

J. Neurosci.

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The lateral superior olive (LSO) is one of the earliest sites in the auditory pathway that is involved in processing acoustical cues to sound location. Here, we tested the hypothesis that LSO neurons can signal small changes in interaural level differences (ILDs), a cue to horizontal sound location, of pure tones based on discharge rate consistent with psychophysical performance in the discrimination of ILDs. Neural thresholds for ILD discrimination were determined from the discharge rates and associated response variability of single units in response to 300 ms tones in the LSO of barbiturate-anesthetized cats using detection theory. Neural response variability was well described by a power function of the mean rate, both in individual neurons and collectively; LSO neurons were less variable than expected from a Poisson process. Compared with psychophysical data, the best-threshold ILDs of single LSO neurons were comparable with or better than behavior over the full range of frequencies (0.3-35 kHz) and pedestal ILDs (Ϯ25 dB) explored in this study. With a pedestal ILD of 0 dB, ILD increments of 1 dB could be discriminated by some neurons, with a median of 4.35 dB across neurons. For pedestal ILDs away from 0 dB, the best-threshold ILDs were as low as 0.5 dB, with a median of 2.3 dB. These findings support the hypothesis that the LSO plays a role in the extraction of ILD, and that the representation of ILD by LSO neurons may set a lower bound on the behavioral sensitivity to ILDs.

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Section: Discussionsupporting

confidence: 75%

Section: Ild Thresholds As Function Of Pedestal Ildmentioning

confidence: 99%

Section: Ild Thresholds As Function Of Pedestal Ildmentioning

confidence: 99%

See 1 more Smart Citation

Interaural Level Difference Discrimination Thresholds for Single Neurons in the Lateral Superior Olive

Tollin¹,

Koka²,

Tsai³

2008

J. Neurosci.

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“…The work of Domnitz and Colburn (1977) confirmed earlier findings (Rowland and Tobias, 1967;Elfner and Perrott, 1967;Hershkowitz and Durlach, 1969;Yost, 1974;Hafter and DeMaio, 1975;Hafter et al, 1977) that showed that sensitivity to interaural differences was usually diminished when the lateral images were located away from midline by introducing an interaural difference of time or level.…”

Section: Introductionsupporting

confidence: 87%

Discrimination of interaural differences of level as a function of frequency

Yost

Dye

1988

The Journal of the Acoustical Society of America

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128

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Discrimination of interaural differences of level (IDLs) was measured for pure tones as a function of frequency and as a function of the interaural difference of phase or level of a standard. Varying the interaural difference of the standard was assumed to change the lateral position of its intracranial image. Threshold IDLs were approximately constant over a frequency range from 200-5000 Hz, except in a region near 1000 Hz where they were slightly elevated. Thresholds increased as the value of the standard interaural differences of phase or level increased, implying that interaural resolution declines as the lateral image moves away from midline. The results are generally consistent with the predictions of current models of lateralization, but additions to these models are required in order for them to account for the slight frequency dependence of threshold IDLs.

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“…By comparison, the ILD JNDs clearly increased with ILD magnitude (Fig. 3) and are comparable to those previously reported by Yost and Dye (1988) out to the maximum offset they tested (15 dB ILD) and slightly higher at lower offsets than those reported by Hafter et al (1977). Again, these changes in binaural sensitivity cannot by themselves explain the magnitude of the increases in MAA as a function of eccentricity which must then also reflect the spatial variation in the acoustic cues.…”

Section: Discussionsupporting

confidence: 66%

Six Degrees of Auditory Spatial Separation

Carlile

Fox

Orchard-Mills

et al. 2016

JARO

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The location of a sound is derived computationally from acoustical cues rather than being inherent in the topography of the input signal, as in vision. Since Lord Rayleigh, the descriptions of that representation have swung between Blabeled line^and Bopponent process^models. Employing a simple variant of a twopoint separation judgment using concurrent speech sounds, we found that spatial discrimination thresholds changed nonmonotonically as a function of the overall separation. Rather than increasing with separation, spatial discrimination thresholds first declined as two-point separation increased before reaching a turning point and increasing thereafter with further separation. This Bdipper^function, with a minimum at 6°of separation, was seen for regions around the midline as well as for more lateral regions (30 and 45°). The discrimination thresholds for the binaural localization cues were linear over the same range, so these cannot explain the shape of these functions. These data and a simple computational model indicate that the perception of auditory space involves a local code or multichannel mapping emerging subsequent to the binaural cue coding.

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Difference thresholds for interaural intensity

Cited by 35 publications

References 13 publications

Interaural Level Difference Discrimination Thresholds for Single Neurons in the Lateral Superior Olive

Interaural Level Difference Discrimination Thresholds for Single Neurons in the Lateral Superior Olive

Discrimination of interaural differences of level as a function of frequency

Six Degrees of Auditory Spatial Separation

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