Explain how neuroscientists trace the efferent connections of a brain region
What will be an ideal response?
Answer: A solution of PHA-L is injected into a brain region, where it is taken up by dendrites and transported to the axon terminals. After a few days, the brain of the animal is processed, using an immunocytochemical method to localize PHA-L molecules in the axon terminals. Because the axon terminals are the end point of an efferent connection, distant regions that contain nerve cells that contain PHA-L are connected with the site of injection.
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Which of the following physical events occurs during REM sleep?
a. Breathing becomes rapid and irregular b. Muscular tension increases as dream activity becomes more intense c. Heart rate decreases d. Eyes begin darting around behind the eyelids once or twice each hour
Society's main standard for judging abnormal behavior is __________
a. the person's experience of inner distress b. whether behavior conforms to the existing social order c. an individual's personal sense of well-being d. the person's success in meeting societal expectations for performance in work, school, and in social relationships