Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Second-order temporal modulation transfer functions.

C Lorenzi1, C Soares, T Vonner

  • 1Laboratoire de Psychologie Expérimentale, UMR CNRS 8581, Institut de Psychologie, Université René Descartes Paris V, Boulogne-Billancourt, France. christian.lorenzi@psycho.univ-paris5.fr

The Journal of the Acoustical Society of America
|August 25, 2001
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Tubed myocutaneous pectoralis major flap: A rescue option in esophagus reconstruction.

JPRAS open·2024
Same author

Lumbosacral pain in a patient with psoriatic arthritis: when the rheumatic disease is innocent.

Reumatismo·2023
Same author

Abnormal electrocardiogram T wave pattern in ischaemic stroke.

Netherlands heart journal : monthly journal of the Netherlands Society of Cardiology and the Netherlands Heart Foundation·2022
Same author

PURA syndrome in a child with severe developmental delay: a challenging diagnosis.

Revista de neurologia·2022
Same author

Serum TSH as a predictor of malignancy in indeterminate thyroid nodules.

Annals of the Royal College of Surgeons of England·2021
Same author

Upper-lip laser frenectomy with a diode laser in a pediatric patient: a case report.

Journal of biological regulators and homeostatic agents·2021

Listeners are best at detecting changes in amplitude modulation strength at low fluctuation rates (below 2-4 Hz) with broadband noise carriers. This suggests auditory processing may involve envelope detection rather than sharp modulation filters.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing

Background:

  • Understanding how the auditory system processes complex temporal modulations is crucial for explaining sound perception.
  • Previous research has explored temporal modulation transfer functions (TMTFs) for amplitude-modulated sounds.

Purpose of the Study:

  • To measure second-order TMTFs for sinusoidal modulation of the modulation depth of a sinusoidally amplitude-modulated (SAM) white noise carrier.
  • To investigate the influence of carrier modulation frequency (fm) on the detection of modulation depth fluctuations.
  • To compare experimental results with predictions from envelope detector and modulation filterbank models.

Main Methods:

  • Detection thresholds were measured for sinusoidal modulation of modulation depth as a function of fluctuation frequency (f'm).

Related Experiment Videos

  • Four listeners participated in experiments using carrier modulation frequencies (fm) of 16, 64, and 256 Hz.
  • Masked modulation detection thresholds for modulation sidebands were measured.

    • Main Results:

    • Second-order TMTFs showed a low-pass characteristic followed by a plateau, indicating optimal sensitivity for f'm below 2-4 Hz.
    • Sensitivity to modulation depth fluctuations is limited for higher fluctuation rates with broadband noise carriers.
    • Results suggest a possible link to beat detection in the sound's temporal envelope.

    Conclusions:

    • Auditory processing of second-order amplitude modulation appears consistent with an envelope detector model.
    • The auditory system's selectivity for modulation fluctuations is relatively poor, with limited high-frequency resolution.
    • Findings suggest that if modulation filters exist, their Q values are likely less than 2.