Perceived silence emerges only after minutes of acclimatization

Evidence

For example, here in the Hoh Valley, away from the water sounds, the natural quiet is typically around 25 to 35 dBA. On paper this hardly looks quiet, but to most ears it will sound stone silent at first. Only after a period of minutes will small textures appear, typically the subtle sound of distant wind playing high in the forest canopy. — Gordon Hempton, John Grossmann, One Square Inch of Silence- One Man’s…, 114

Categorization

• QUESTION: What is the acoustic or psychological mechanism of this acclimatization — attentional filtering or auditory gain?
• corroborated: 2 independent passages support this claim — Gordon Hempton, John Grossmann, One Square Inch of Silence- One Man’s…, 114
• XREF: connects to: A deaf man’s brain feels less silent without hearing aids than with them on — George Michelsen Foy, Zero Decibels: The Quest for Absolute…, 323; Total silence can overwhelm the mind as an alien, unbearable presence — George Michelsen Foy, Zero Decibels: The Quest for Absolute…, 222; the MOC “The Loud Cost of Quiet — What We Protect and Sacrifice When We Choose Silence”