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Experiments with both humans and chinchillas indicate that the temporary threshold shift after ten-minute stimulation with 100 dB sound pressure level 1 kHz tone diminished more quickly if the subject breathed pure oxygen and it diminished even more quickly when 95% oxygen-5% carbon dioxide was inhaled rather than ambient air. This effect was observed for both poststimulatory and per-stimulatory gas inhalation.
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Joglekar et al. (1977) studied this question.
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