You are watching a rat in a Skinner box, and every time a red light comes on the rat presses the lever in the box. However, when a green light comes on the rat never presses the lever. In this case, it appears that the color of the light is acting as:.
a. a positive reinforcer for bar pressing.
b. a negative reinforcer for bar pressing.
c. an unconditioned stimulus for bar pressing.
d. a discriminative stimulus for bar pressing.

d. a discriminative stimulus for bar pressing.

Explanation:

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.

c: in the east might be the correct answer