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Related Experiment Videos

Frequency modulation detection interference produced by asynchronous and nonsimultaneous interferers.

H Gockel1, R P Carlyon

  • 1MRC Cognition and Brain Sciences Unit, Cambridge, United Kingdom. hedwig.gockel@mrc-cbu.cam.ac.uk

The Journal of the Acoustical Society of America
|December 7, 2000
PubMed
Summary
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Even when sounds are not simultaneous, frequency modulation (FM) interference impacts detection. This study shows that asynchronous and gapped FM interferers significantly raise detection thresholds, suggesting a perceptual asymmetry.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing

Background:

  • Auditory detection of frequency modulation (FM) can be impaired by interfering sounds.
  • Previous research has primarily focused on simultaneous or continuous interferers.

Purpose of the Study:

  • To investigate the impact of asynchronous and nonsimultaneous interferers on the detection of sinusoidal frequency modulation (FM).
  • To compare the effects of synchronous, asynchronous, and gapped interferers on FM detection thresholds.

Main Methods:

  • A two-interval, two-alternative forced-choice (2I-2AFC) adaptive procedure was used.
  • Listeners detected 15 Hz FM on a 1 kHz carrier (target) presented with synchronous, asynchronous, or gapped 2.3 kHz FM interferers.
  • Interferer timing and gap duration were systematically varied.

Related Experiment Videos

Main Results:

  • Both synchronous and asynchronous FM interferers significantly increased FM detection thresholds.
  • "Gapped" interferers, presented before and after the target but not during, also significantly increased thresholds.
  • Nonsimultaneous FM interferers caused frequency modulation detection interference (FMDI) even when perceived as separate auditory objects.

Conclusions:

  • Frequency modulation detection interference (FMDI) occurs even with nonsimultaneous and gapped interferers.
  • Findings support theories of perceptual asymmetry between steady and modulated sounds.
  • Adaptation or filter bank ringing are less likely explanations for the observed interference.