Q1. For approximately how long does the experience of sound persist in our brain?
- (a) 0.01 s
- (b) 0.1 s
- (c) 1 s
- (d) 10 s
Answer & solution
Answer: (b) 0.1 s
The persistence of hearing (also called 'auditory persistence') is approximately 0.1 seconds (100 milliseconds). This is analogous to the persistence of vision for light, which is also about 0.1 seconds. This means that after a sound stimulus ends, our brain continues to perceive it for about 0.1 seconds. This principle is important in music and speech perception — it allows us to connect individual sounds into a continuous stream. This is why we can hear musical notes as connected melodies rather than isolated sounds, and why speech sounds blend into understandable words. The 0.1-second persistence is used in the design of audio systems and has applications in hearing aids and cochlear implants.
Option (a) 0.01 s — Incorrect: 0.01 seconds (10 milliseconds) is too short for auditory persistence; the brain retains sound experience for approximately 0.1 seconds.
Option (c) 1 s — Incorrect: 1 second is too long for the basic persistence of a sound experience; the standard value of auditory persistence is 0.1 seconds.
Option (d) 10 s — Incorrect: 10 seconds refers to short-term memory retention, not the basic neurological persistence of sound experience, which is about 0.1 seconds.