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Interference: Path Lengths01:10

Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...

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Behavioral Assessment of Hearing in 2 to 4 Year-old Children: A Two-interval, Observer-based Procedure Using Conditioned Play-based Responses
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Published on: January 23, 2017

Effect of inter-aural modulation depth difference on interaural time difference thresholds for speech: An

Arivudainambi Pitchaimuthu1, Vibha Kanagokar1, Srividya Grama Bhagavan2

  • 1Department of Audiology and Speech Language Pathology, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal, Mangaluru, Karnataka, 575001, India.

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|August 9, 2020
PubMed
Summary
This summary is machine-generated.

Differences in temporal envelope (ENV) modulation depth between ears significantly impact inter-aural time difference (ITD) thresholds. Increased differences in ENV depth lead to higher ITD thresholds, highlighting ENV

Keywords:
ITD thresholdInteraural time differenceinteraural envelope differencelateralizationlocalizationmodulation depthtemporal envelope

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • The temporal envelope (ENV) is crucial for inter-aural time difference (ITD) perception, particularly in clinical populations.
  • Background noise and signal processing (e.g., compression) can differentially affect ENV modulation depth in each ear.
  • The impact of inter-aural ENV modulation depth disparities on ITD thresholds remains largely unexplored.

Purpose of the Study:

  • To investigate the effect of differences in temporal envelope modulation depth between the ears on inter-aural time difference (ITD) thresholds.
  • To determine if varying degrees of ENV modulation depth asymmetry influence the precision of ITD perception.

Main Methods:

  • Six young adults with normal hearing participated.
  • Vowel-consonant-vowel (VCV) stimuli were used, with ENV modulation depth reduced by 0%, 29%, and 50% (resulting in 100%, 71%, and 50% of original depth).
  • ITD thresholds were measured while systematically varying the difference in ENV modulation depth between the ears, keeping one ear's depth constant at 100%.

Main Results:

  • A significant main effect of inter-aural modulation depth differences on ITD thresholds was found (F(2,10)= 9.04, p= 0.006).
  • ITD thresholds increased as the difference in ENV modulation depth between the ears increased.
  • This suggests that binaural processing of ITD is sensitive to disparities in temporal envelope information.

Conclusions:

  • Inter-aural temporal envelope (ENV) depth is a critical factor for accurate inter-aural time difference (ITD) perception.
  • Asymmetries in ENV modulation depth between the ears degrade ITD thresholds.
  • These findings have implications for understanding auditory perception in noisy environments and with hearing aid processing.