L3
讲座
1. What is the lecture mainly about?
Competing hypotheses about the area of the brain responsible for memory
Psychological research that led to the development of the PET scan
How a long-held belief about the brain was disproved
How the brain processes energy
2. Why does the professor describe an experiment done in 1953?
To explain why scientists thought that the brain rested between cognitive tasks
To explain how scientists discovered the region of the brain that processes numbers
To identify the first evidence suggesting that the brain is always active
To indicate that the brain’s use of oxygen fluctuates throughout the day
3. What does the professor emphasize about the brain’s use of calories?
The brain needs more calories for cognitive tasks than for social tasks.
The brain uses more calories than might be expected.
The brain’s midline uses more calories than other areas of the brain.
The brain conserves calories for the most demanding cognitive tasks.
4. In the PET-scan experiments, what were test subjects doing when the default network was the LEAST active?
Reading
Relaxing
Sleeping deeply
Looking for a familiar face
5. Why does the professor mention the hippocampus?
To help explain why daydreaming is so common
To explain why some memories appear to be stored in the default network rather than in the hippocampus
To indicate that the size of a brain area is unrelated to its importance
To identify a possible function of the default network.
6. Why does the professor say this:
To emphasize that the default network has been researched for many years
To indicate that only part of the default network has been mapped out
To express admiration for the new tools available for psychological research
To reinforce the significance of the discovery of the default network
