Relating to or denoting sound waves with a frequency below the lower limit of human audibility.
- Using calls that have infrasonic fundamental frequencies, female elephants are able to communicate with large numbers of specific individuals over long distances.
- Preliminary findings with electrostatic fields, ionizing radiation, infrasonic waves, and meteorological factors are also examined to consider their effects on the brain in relation to apparitional experiences.
- When the rate of vibration is below the range of human hearing, the sound is termed infrasonic; when it is above that range, it is called ultrasonic.
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