Absolute threshold refers to the smallest intensity of a stimulus that can be detected.

Absolute threshold refers to the smallest intensity of a stimulus that can be detected.

• A. The strongest detectable signal
• B. The constant intensity needed for adaptation
• C. The point at which a stimulus becomes painful
• D. The weakest detectable signal

Answer: (D)

The absolute threshold is the minimum stimulus intensity that a person can detect, typically around 50% of the time. That makes it the weakest detectable signal. It isn’t about the strongest signal, nor about adaptation to a constant stimulus, nor about when a stimulus becomes painful. In everyday terms, it’s the faintest thing you can notice—like the dimmest light you can just perceive in the dark or a whisper you can barely hear. This threshold can shift with attention, motivation, and context, and it’s measured using specific psychophysical methods because detection depends on the brain sensing real signals amid noise. It’s helpful to keep in mind that the related idea—the difference threshold—concerns the smallest detectable change in a stimulus, not the initial detection itself.

The absolute threshold is the minimum stimulus intensity that a person can detect, typically around 50% of the time. That makes it the weakest detectable signal. It isn’t about the strongest signal, nor about adaptation to a constant stimulus, nor about when a stimulus becomes painful. In everyday terms, it’s the faintest thing you can notice—like the dimmest light you can just perceive in the dark or a whisper you can barely hear. This threshold can shift with attention, motivation, and context, and it’s measured using specific psychophysical methods because detection depends on the brain sensing real signals amid noise. It’s helpful to keep in mind that the related idea—the difference threshold—concerns the smallest detectable change in a stimulus, not the initial detection itself.