By looking over the chapter outline, the summary, the Key Questions, and Core Concepts, you form the impression of the overall meaning of the material. The details are later associated with this overall impression. This is known as

Neurons cannot fire fast enough to keep up with high-pitched sound waves. Therefore, they alternate firing according to the ______

a. place theory b. frequency theory c. volley principle d. switch theory

The lowest level of a stimulus needed for the nervous system to detect a change half the time is called the ___________

A) difference threshold B) just noticeable difference C) sensory adaptation D) absolute threshold