Attention deficit/hyperactivity disorder is sometimes treated with medication that slows down the activity of the child's nervous system

After feeding a dog with a red bowl but never giving any food with a green bowl, the dog now salivates only to the red bowl. This is an example of:

a. insight learning. b. higher-order conditioning. c. spontaneous recovery. d. extinction. e. stimulus discrimination.

In experimental research, one variable is systematically changed. This variable is known as the ________

A) confound B) dependent variable C) independent variable D) experimental group E) control variable