Neil is seated in a dark room and asked to look at a screen. He watches as flashes of light, varying in brightness, are shown on the screen one at a time. Whenever he notices a flash, he informs the researchers. What are the researchers measuring?

Researchers are now looking for new ways to stimulate the brains of severely depressed individuals. One method, called __________, involves the use of a pulsing coil held to a person's skull at the left prefrontal cortex

a. psychosurgery b. deep brain stimulation c. electroconvulsive therapy d. transcranial magnetic stimulation

Six months ago, a nursing home started a program in which some residents were allowed to choose their daily activities. All else being equal, which of the following residents is likely to die soonest?

a. Edgar, who participated over the entire course of the program b. Ruth, who recently joined the program c. Martha, who recently dropped out of the program d. George, who never participated in the program