Darren plays golf because he enjoys the sport. His motivation for playing golf is a(n) _______ one

The _____ theory is the theory of color vision that suggests three kinds of cells respond by increasing or decreasing their rate of firing when different colors are present

a) opponent-process b) decreasing-rate c) three-cone d) trichromatic

Caffeine's ability to keep you awake is due to:

a. Enhancing the release of adenosine b. Blocking adenosine receptors c. Inhibition of REM d. Inhibition of slow-wave activity