题目内容
In (), perception is guided by higher-level knowledge, experience, expectations, and motivations.
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The ability to view the world in three dimensions and to perceive distance—a skill known as depth perception—is due largely to the fact that we have ().
()waves show that a person is awake but is not actively processing visual information. Alpha waves generally are observed when the person is relaxed and inattentive (such as in daydreaming).
During this cycle the heartbeat increases, breathing becomes shallow, eyes move rapidly, muscles are relaxed, dreams are most vivid, and brain waves resemble those during waking. What stage is this?
In the early 1900s, Ivan Pavlov, a famous Russian physiologist who did Nobel prize-winning research on digestion, conducted a marvelous experiment that demonstrated what has come to be called () .
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