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Related Experiment Videos

Theory of resistive load detection.

C K Mahutte, E J Campbell, K J Killian

    Respiration Physiology
    |February 1, 1983
    PubMed
    Summary

    The brain detects added breathing resistance when the phase angle lag exceeds a critical threshold. This detection follows Weber's law, where the just noticeable resistance change is a constant fraction of the baseline resistance.

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    Area of Science:

    • Respiratory physiology
    • Psychophysics

    Background:

    • The brain regulates breathing by adjusting muscle pressure to overcome airway resistance and lung elastance.
    • Breathing mechanics involve a phase lag between pressure and flow, quantifiable by a phase angle.

    Purpose of the Study:

    • To investigate the detection threshold of added respiratory resistive loads.
    • To determine if resistive load detection adheres to psychophysical laws, specifically Weber's law.

    Main Methods:

    • Mathematical analysis of respiratory mechanics under varying basal resistances.
    • Comparison of theoretical predictions with existing experimental data on resistive load detection.

    Main Results:

    • The study predicts that resistive load detection occurs when the change in phase angle exceeds a critical value.
    • Mathematical analysis indicates that the just noticeable added resistance (delta R) is a constant fraction of the basal resistance (R), supporting Weber's law (delta R/R = constant).
    • The model aligns with experimental observations showing delta R/R increases at low basal resistances.

    Conclusions:

    • Respiratory resistive load detection appears to follow Weber's psychophysical law.
    • The developed theory predicts that breathing frequency and elastance may influence the Weber relationship for resistive loads, warranting further experimental validation.

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