An experimenter compared the reaction times of participants to a red light and to a yellow light and found that reaction time was faster for the yellow light. However, it was also discovered that the yellow light was perceived by the participants as being brighter than the red light. In this experiment,
A) the color of the light is confounded with reaction time.
B) the color of the light is confounded with the perceived intensity of the light.
C) the red light is confounded with the yellow light.
D) there are no confounds.

Question

Quizplus · Accepted Answer

The color of the light (red vs. yellow) is confounded with the perceived intensity of the light (brightness), as the difference in reaction times could be due to the perceived brightness rather than the color itself.

An Experimenter Compared the Reaction Times of Participants to a Red