Which psychologist described the state of attention overload and believed that city dwellers learn to prevent it by engaging only in brief, superficial social contacts, by ignoring nonessential events, and by fending off others with cold and unfriendly expressions?

Red-green color blind individuals do not have a severe difficulty with traffic lights because

a. the red light is always on top and the green light is brighter than the red. b. the "red" traffic signals have blue light mixed in with the red. c. the "green" light is really yellow­green. d. all of these are utilized.

The afterimages you have seen after looking at a flashbulb are a result of the visual pigments in the retina

a. recombining. b. multiplying. c. bleaching. d. becoming more sensitive.