Unconscious forms of prejudice are thought to be measured with the implicit associations test. This test is based on:

a. the types of words people typically make up when they see a person of a specific race.
b. how long it takes people to respond to positive or negative words along with Black or White faces.
c. changes in heart rate that accompany photos of people from different racial backgrounds.
d. increased activity in the emotional centers of the brain that are associated with specific races.

Answer: B

Rationale: With these associations, it takes an average of 800 milliseconds (four-fifths of a second) to press the correct button.