Substance P is related to the sense of balance

In order to draw a conclusion about the relation between TV violence and

aggressive behavior, one should (a) ignore correlational studies (b) ignore flawed studies (c) concentrate on studies with control groups (d) look at the whole body of research, as opposed to single, isolated studies (e) rely on the judgment of the advertisers and TV executives

Which theory of color vision is best able to explain negative color afterimages?

a. retinex theory b. opponent-process theory c. trichromatic theory d. kodak theory