A dog whistle Can be heard by dogs but no by humans. This whistle takes advantage of a characteristic Of sensory systems know as. A. The absolute Threshold. B. The difference gradient C. Perceptual Defense. D. A just Noticeable difference.

Question

A dog whistle Can be heard by dogs but no by humans. This whistle takes advantage of a characteristic Of sensory systems know as.                           A. The absolute Threshold. B. The difference gradient C. Perceptual Defense. D. A just Noticeable difference.

anonymous · Answer

A. Threshold
Dogs and other animals can actually hear things that are above and below our levels (or threshold) of hearing. They may hear sounds in the areas under our perceivable regions, like in the case of a dog that barks when an earthquake is about to shake, and they can well hear things that are over our hearing range.