Concurrent motion detection based on dynamic changes in interaural delay

Saberi, Kourosh; Tirtabudi, Prisilia; Petrosyan, Agavni; Perrott, David R.; Strybel, Thomas Z.

doi:10.1016/s0378-5955(02)00652-4

Cited by 13 publications

(15 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This can be taken as evidence for the existence of an across-frequency integration mechanism for the ITD, which is consistent with earlier studies (e.g., [2][3][4][5][6]). Experiments 1 and 2, however, consistently failed to present compelling evidence for a mechanism that can effectively sum or compare directional information of ITD modulations across frequency channels, although some indications were found for limited conditions and listeners.…”

Section: Discussionsupporting

confidence: 91%

“…Experiments 1 and 2, however, consistently failed to present compelling evidence for a mechanism that can effectively sum or compare directional information of ITD modulations across frequency channels, although some indications were found for limited conditions and listeners. The results are, again, consistent with the results by Saberi et al [4]. Saberi et al showed that the existence of another frequency component interferes with the detection of linear ITD modulation at a target frequency and that in some conditions, the degree of interference is greater when the interferer's ITD modulation direction is the same as the target's than when it is the opposite.…”

Section: Discussionsupporting

confidence: 90%

“…There are pieces of evidence indicating that ITD information is combined across frequencies. The presence of a signal at another frequency interferes with the detection or lateralization of a static or dynamic ITD on one frequency (known as the binaural interference; e.g., [2][3][4]). It is known also that the ambiguity of laterality for a sinusoidal stimulus with a certain ITD (known as the phase ambiguity) can be resolved when additional sinusoidal signals with the same ITD are presented at remote frequencies (e.g., [5,6]).…”

Section: Introductionmentioning

confidence: 99%

“…However, only few studies have explored whether and how the directional information about ITD changes is combined across frequencies. One of them is the study by Saberi et al [4], which showed that the presence of a tone at another frequency interferes with the detection of a linearly changing ITD at one frequency and that, in certain conditions, the interference is greater when the interfering tone changes in ITD in the same direction as the target tone than when it changes in the opposite direction. This result can be taken as evidence that the binaural system is sensitive to the relative direction of ITD changes across frequencies.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Insensitivity to the coherence of interaural-time-difference modulation across frequency channels

Furukawa¹,

Nishida

Kondo³

et al. 2013

Acoust. Sci. & Tech.

View full text Add to dashboard Cite

The present study examined the dynamic properties of the across-frequency integration mechanism, specifically the extent to which the information about the direction of changes in the interaural-time difference (ITD) is integrated or compared across frequencies. The stimulus was a complex tone consisting of two sinusoidal carriers, one at 400 and the other at 700 Hz. A sinusoidal modulation in the ITD was imposed on one carrier alone or the two carriers simultaneously. The ITD of each carrier was centered at 0 ms, and the modulation started and ended with the zero phase. ITD modulations, when imposed on the two carriers simultaneously, were in-phase or anti-phase between them. Experiment 1 measured the threshold modulation depth for detecting the modulation with an adaptive method. The thresholds were generally lower when both carriers were modulated than when only one was, indicating across-frequency integration of the information about the presence of modulation. The threshold, however, was not significantly different between the in-phase and antiphase conditions, even when the modulation rate was as low as 1 Hz. Experiment 2 measured the discriminability between in-phase and anti-phase modulations. Modulation depth was fixed at a suprathreshold value (600 ms). The performance varied largely among the listeners, and it was near the chance level for half of listeners even for a 1-Hz rate. The study failed to present compelling evidence that the auditory system is sensitive to the relative phase of ITD modulations for the conditions tested. This suggests that the directional information of even slow ($1 Hz) ITD modulation is not combined effectively across frequencies, at least for the conditions tested.

show abstract

Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Insensitivity to the coherence of interaural-time-difference modulation across frequency channels

Furukawa¹,

Nishida

Kondo³

et al. 2013

Acoust. Sci. & Tech.

View full text Add to dashboard Cite

show abstract

“…In previous studies, a variety of signal-processing techniques have been used to simulate interaural delay-based motion. Among these are binaural beat waveforms that use pure tones of slightly different frequencies presented to the two ears (Perrott & Nelson, 1969;Saberi, Tirtabudi, Petrosyan, Perrott, & Strybel, 2002, 2003, FM noises that produce nonlinear (sinusoidal) motion (Grantham & Wightman, 1978), and summing time-domain-generated sinusoids combined with a binaural beat paradigm to simulate motion of broadband sounds (Smith et al, 2004). The latter technique, although successful in generating linear motion, 1 is extremely timeconsuming for standard stimulus sampling rates and durations (e.g., 0.1-1 sec at 44.1 kHz) and would require calculation of hundreds of sinusoids with independent amplitudes and phases.…”

mentioning

confidence: 99%