What is sensory adaptation?

• A. The strength of the sensation decays with time
• B. The strength of the sensation increases with time
• C. The sensation remains constant with time
• D. The strength of the sensation generated by many types of receptors decays with time

Answer: (D)

Sensory adaptation is the reduced responsiveness of sensory receptors to a constant stimulus over time. As the stimulus remains the same, the receptors fire less, so the signal reaching the brain weakens and the perceived intensity fades. The best option captures this receptor‑level fading across many senses: the strength of the sensation generated by many types of receptors decays with time. For example, you notice a room’s warmth less after you’ve been in it for a while, or a constant background sound becomes less noticeable. The other statements describe increasing strength, a sensation that stays the same, or a general decay without tying it to receptor activity, which doesn’t accurately describe the phenomenon.