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Cochlear microphonics generated by microwave pulses
Abstract:
Oscillations at 50 kHz have been recorded from the round window of guinea pigs during irradiation by 918-MHz pulsed microwaves. The oscillations promptly follow the stimulas, outlast it by about 200 musec and measure to 50 muV in amplitude. They precede the auditory nerve's response and disappear with death. They are interpreted to be a cochlear microphonic and hence to demonstrate that the microwave auditory effect, in the guinea pig at least, is accompanied by a mechanical disturbance of the hari cells of the cochlea.
Insights
Pulsed microwaves trigger 50 kHz oscillations in guinea pig cochleas, demonstrating a mechanical disturbance of hair cells and confirming the microwave auditory effect.
Area of Science:
- Bioacoustics
- Electrophysiology
- Microwave Auditory Effect
Background:
- The microwave auditory effect describes sound perception induced by microwave irradiation.
- Previous research has explored the mechanisms behind this phenomenon.
Purpose of the Study:
- To investigate the physiological basis of the microwave auditory effect in guinea pigs.
- To determine if microwave exposure causes mechanical disturbances in the cochlea.
Main Methods:
- Guinea pigs were exposed to 918-MHz pulsed microwaves.
- Oscillations were recorded from the round window at 50 kHz.
- Measurements of oscillation amplitude and duration were taken.
Main Results:
- Prompt oscillations (up to 50 muV) were recorded, following and outlasting the microwave stimulus.
- These oscillations preceded auditory nerve responses.
- The oscillations ceased upon the animal's death.
Conclusions:
- The recorded oscillations are interpreted as cochlear microphonics.
- This suggests the microwave auditory effect involves a mechanical disturbance of cochlear hair cells in guinea pigs.