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Physiological noise and its influence on vibrotactile perception thresholds.

J E Piercy, A J Brammer, W Taylor

    Scandinavian Journal of Work, Environment & Health
    |August 1, 1986
    PubMed
    Summary

    Physiological noise from breathing, circulation, and hand tremor significantly impacts vibrotactile perception thresholds. This biological vibration, similar in amplitude to perception limits, can influence tactile signal detection.

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    Area of Science:

    • Biophysics
    • Human Sensory Perception
    • Neuroscience

    Background:

    • Vibrotactile perception thresholds are crucial for understanding tactile sensitivity.
    • Physiological noise, vibrations originating from bodily functions, can potentially interfere with sensory measurements.
    • Understanding the characteristics and impact of physiological noise is essential for accurate vibrotactile research.

    Purpose of the Study:

    • To characterize the acceleration spectrum of physiological noise in the fingertip.
    • To identify the sources contributing to physiological noise.
    • To assess the relationship between physiological noise and vibrotactile perception thresholds.

    Main Methods:

    • A small diameter probe attached to a vibrator and accelerometer was used.

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  • The probe was held in contact with the fingertip to measure acceleration spectra.
  • Analysis focused on the frequency range from 0.1 to 10 Hz and above.

    • Main Results:

    • A broad plateau in acceleration spectrum (-20 dB re 1 (m/s2)2/Hz) was observed between 0.1 and 10 Hz.
    • Respiration (0.2-1 Hz), blood circulation (1-5 Hz), and hand tremor (6-8 Hz) were identified as major contributors.
    • Physiological noise amplitude was comparable to vibrotactile perception thresholds and independent of experimental parameters.

    Conclusions:

    • Physiological noise is a significant factor in vibrotactile measurements.
    • This noise can influence vibrotactile thresholds, particularly in the 2-250 Hz range.
    • Further research is needed to understand the masking and adaptation effects of physiological noise on tactile perception.