When researchers wish to observe the same subjects on many occasions over a long period of time, they use a(n) _________ study.

Schachter and Singer demonstrated that an individual in a state of arousal for which she/he does not have a satisfactory explanation, will:

A) Tend to label this state in terms of alternative cues available from the environment. B) Not tend to label this state in terms of alternative cues available from the environment. C) Be readily manipulated into states of emotion. D) Try to manipulate others with her/his feelings. E) Both (A) & (C).

Photoreceptors in the human eye include

a. rods and cones. b. amacrine cells. c. ganglion cells. d. bipolar cells. e. optic nerve.