Why a Sudden Sound Wakes Us Before We Understand What We Heard

Nina Kraus reveals the uncomfortable truth about sound and attention: volume is not what wakes us. The eye muscle closes within 30 to 60 milliseconds of a sharp sound, yet identifying what was heard takes additional tenths of a second. In Ohio experiments with 176 children, a human voice woke 91 percent from deep sleep; the standard beep managed 53 percent. Mismatch negativity, onset speed under 10 milliseconds, and habituation's exponential decay explain why a sound heard once a year retains its power.

You'll learn:

- Why a 15-decibel rise triggers stronger amygdala response than volume alone

- How prepulse inhibition cuts startle response by half

- What the shofar's rarity preserves that repetition destroys