3. What role does the cochlea's basilar membrane play in
auditory processing?
A. Converts sound waves into electrical signals
B. Transfers vibrations to the tympanic membrane
C. Separates sound frequencies spatially
D. Absorbs and dissipates sound energy
Correct Answer: C. Separates sound frequencies
spatially
Rationale: The basilar membrane varies in width and
stiffness along its length, enabling it to perform frequency
decomposition of incoming sounds through a process called
tonotopic mapping.
---
4. Which of the following best describes the phenomenon
of 'lateral inhibition' in the sensory systems?
A. Enhancement of sensory signals in low-light conditions
B. Suppression of neighboring neurons' activity to
sharpen stimulus perception
C. Random firing of sensory neurons to detect weak
stimuli
D. Integration of sensory information across modalities
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