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Related Experiment Videos

Weber's law and resistive load detection.

D G Stubbing, K J Killian, E J Campbell

    The American Review of Respiratory Disease
    |January 1, 1983
    PubMed
    Summary
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    Detecting breathing resistance changes is consistent across various levels. However, the ability to detect added resistance (delta R50) significantly decreases at very low background resistances (Ro), impacting respiratory sensation.

    Area of Science:

    • Respiratory Physiology
    • Sensory Perception

    Background:

    • The human respiratory system's ability to detect changes in airflow resistance is crucial for maintaining breathing homeostasis.
    • Understanding the sensory mechanisms underlying respiratory load detection is essential for diagnosing and managing respiratory disorders.

    Purpose of the Study:

    • To investigate the threshold of detection for added resistive loads to breathing (delta R50) across a range of background resistances (Ro).
    • To determine if the Weber fraction (delta R50/Ro) remains constant across different background resistances, similar to other sensory systems.

    Main Methods:

    • Four healthy subjects were recruited to measure the threshold of detection for added resistive loads.
    • Background resistances were manipulated by altering external resistors and by having subjects breathe heliox (a low-density gas mixture).

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    Main Results:

    • Under normal conditions, the mean delta R50 was 0.53 cm H2O/L/s, with a Weber fraction of 0.24.
    • Increasing background resistance led to a proportional increase in delta R50, maintaining a consistent Weber fraction.
    • Breathing heliox to decrease background resistance did not change delta R50, but increased the Weber fraction to 0.49, indicating a heightened sensitivity to added loads.

    Conclusions:

    • The Weber fraction for respiratory resistive load detection is relatively constant over a wide range of background resistances.
    • A sharp increase in the Weber fraction occurs at low background resistances, suggesting a change in sensory processing.
    • These findings suggest that respiratory sensory perception, like other sensory modalities, exhibits non-linear behavior at the extremes of background stimulation.