Noise perceived as a danger signal triggers fight-or-flight responses even during sleep

Evidence

Noise, even at levels that are not harmful to hearing, is perceived subconsciously as a danger signal, even during sleep. The body reacts to noise with a fight-or-flight response, with resultant nervous, hormonal, and vascular changes that have far reaching consequences. — Gordon Hempton, John Grossmann, One Square Inch of Silence- One Man’s…, 1052

Categorization

• XREF: Connects to physiological claims about noise already built up in earlier chapters — the body’s autonomous response to sound independent of conscious annoyance. — connects to: Extreme battlefield noise can annihilate thought and reduce a person to helpless reflex — George Michelsen Foy, Zero Decibels: The Quest for Absolute…, 424; Prey animals avoid noisy areas because sound is their security surveillance — Gordon Hempton, John Grossmann, One Square Inch of Silence- One Man’s…, 107; Chronic noise conflict has driven ordinary people to lethal violence — George Michelsen Foy, Zero Decibels: The Quest for Absolute…, 48 (+5 more)
• corroborated: 3 independent passages support this claim — Gordon Hempton, John Grossmann, One Square Inch of Silence- One Man’s…, 1052

Broader Connections

• Extreme battlefield noise can annihilate thought and reduce a person to helpless reflex #exemplifies (0.85) — George Michelsen Foy, Zero Decibels, 424