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Media type:
E-Article
Title:
Thresholds of cat cochlear nucleus neurons to microwave pulses
Contributor:
Seaman, Ronald L.;
Lebovitz, Robert M.
Published:
Wiley, 1989
Published in:
Bioelectromagnetics, 10 (1989) 2, Seite 147-160
Language:
English
DOI:
10.1002/bem.2250100204
ISSN:
0197-8462;
1521-186X
Origination:
Footnote:
Description:
AbstractAction potentials of neurons in cat dorsal and posteroventral cochlear nuclei were recorded extracellularly with glass microelectrodes while the head of the cat was exposed to microwave pulses at 915 MHz using a diathermy applicator. Response thresholds to acoustic tones, acoustic clicks, and microwave pulses were determined for auditory units with characteristic frequencies (CFs) from 278 Hz to 39.2 kHz. Tests with pulsatile stimuli were performed for durations of 20–700 μs, principally 20, 70, and 200 μs. Brainstem midline specific absorption rate (SAR) threshold was as small as 11.1 mW/g per pulse, and specific absorption (SA) threshold was as small as 0.6 μJ/g per pulse. Microwave thresholds were generally lower for CF less than 9 kHz, as were most acoustic thresholds. However, microwave threshold was only weakly related to click threshold and CF‐tone threshold of each unit.