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Updated: Dec 25, 2025

Measurement of Vibration Detection Threshold and Tactile Spatial Acuity in Human Subjects
Published on: September 1, 2016
Spectral integration of infrasound at threshold
Björn Friedrich1, Holger Joost2, Thomas Fedtke2
1Department of Experimental Audiology, Otto von Guericke University Magdeburg, Leipziger Straße 44, 39120 Magdeburg, Germany.
Adding more spectral components to infrasound stimuli lowers hearing thresholds. This suggests the auditory system integrates intensity across multiple frequencies for infrasound perception.
Area of Science:
- Auditory Neuroscience
- Acoustics
- Psychoacoustics
Background:
- Infrasound perception is not fully understood.
- The influence of spectral complexity on auditory thresholds requires further investigation.
Purpose of the Study:
- To determine how the number of spectral components affects the hearing threshold for infrasound.
- To explore intensity integration mechanisms in infrasound perception.
Main Methods:
- Mon aural presentation of infrasound stimuli with one, two, or three sinusoidal components.
- Utilized a low-distortion infrasound reproduction system.
- Compared pure-tone thresholds with complex tone thresholds.
Main Results:
- Each spectral component's threshold decreased by 3 dB when two components were presented simultaneously.
- Thresholds decreased further with a three-tone complex stimulus.
- Results support the hypothesis of perceptually weighted intensity integration.
Conclusions:
- The number of spectral components significantly impacts infrasound detection thresholds.
- Auditory intensity integration plays a role in processing complex infrasound stimuli.
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