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Suppose one wants to test independence between the two variables of a contingency table. The values in the table constitute the observed frequencies of the dataset. But how does one determine the expected frequency of the dataset? One of the important assumptions is that the two variables are independent, which means the variables do not influence each other. For independent variables, the statistical probability of any event involving both variables is calculated by multiplying the individual...
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Related Experiment Video

Updated: Jun 25, 2025

fMRI Mapping of Brain Activity Associated with the Vocal Production of Consonant and Dissonant Intervals
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Relative Fundamental Frequency: Only for Hyperfunctional Voices? A Pilot Study.

Sol Ferrán1, Carla Rodríguez-Zanetti1, Octavio Garaycochea1

  • 1Clínica Universidad de Navarra, 31008 Pamplona, Spain.

Bioengineering (Basel, Switzerland)
|May 25, 2024
PubMed
Summary
This summary is machine-generated.

Relative fundamental frequency (RFF) analysis offers a cost-effective method for assessing vocal fold biomechanics. This acoustic parameter effectively distinguishes between healthy and pathological voices, including those with vocal fold paralysis.

Keywords:
muscle tension dysphoniarelative fundamental frequencyvocal hyperfunctionvocal offsetvocal onsetvoice acoustics

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Area of Science:

  • Laryngology
  • Acoustic analysis
  • Voice disorders

Background:

  • Assessing phonatory disorders requires aerodynamic analysis of laryngeal biomechanics.
  • Relative fundamental frequency (RFF) is an acoustic parameter potentially useful for this assessment.
  • Current voice laboratory protocols may allow for RFF analysis.

Purpose of the Study:

  • To evaluate the utility of RFF in assessing laryngeal biomechanical alterations.
  • To determine if RFF can be studied using existing acoustic analysis protocols.
  • To investigate the association between RFF and specific voice pathologies.

Main Methods:

  • Retrospective cohort study of patients with muscular tension dysphonia, organic lesions, and vocal fold paralysis (VFP).
  • Inclusion of a control group.
  • Endoscopic laryngeal exploration, acoustic study, RFF calculation, and aerodynamic study.

Main Results:

  • 79 patients and 22 controls were analyzed.
  • Significant differences in RFF onset cycles were found between healthy and pathological groups.
  • RFF distinguished between different laryngeal disorder groups.

Conclusions:

  • RFF is a valuable indicator of phonatory biomechanics.
  • RFF in onset cycles provides a cost-effective and accurate method for assessing biomechanical disorders.
  • This study presents novel RFF values for VFP, irrespective of aerodynamic patterns.