Compare and contrast MRIs, PET scans, and fMRI.
What will be an ideal response?
The MRI measures variations in magnetic fields. It then computes and depicts cross sections of organs such as the brain with great clarity. It is noninvasive and allows for visualization of all but the tiniest brain structures. Its major problem is the claustrophobic reaction some people have to the procedure. PET scans track substances as they are metabolized by the brain. They can show how the brain is functioning-and they can help identify areas that are functioning abnormally, even in ways that might not be obvious anatomically. Their major problem is their low-fidelity pictures, which have so far limited their value. The fMRI measures changes in blood flow in the brain. It is possible to map ongoing psychological activity and show which areas of the brain are involved in different activities. However, like MRIs, these are very sensitive to movement, which can cause false results. Also, fMRIs are often very hard to interpret. GRADING RUBRIC: 6 points, 2 for accurately describing each imaging technique.
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A. true negative. B. true positive. C. false negative. D. false positive.
Survey researchers should write questions at what readability level?
a. Moderate readability level b. Readability level of the survey population c. Low readability level d. High readability level
Drugs that block the activities of neurons sensitive to __________ and __________ will
produce symptoms of __________. a. acetylcholine; dopamine; the bipolar disorders b. epinephrine; serotonin; mania c. reserpine; GABA; schizophrenia d. norepinephrine; serotonin; depression e. epinephrine;GABA; mania
Skinner designed a soundproof apparatus, often equipped with a lever or bar, with which he conducted his experiments in operant conditioning. This has been called a _____
a) reinforcement chamber. b) Skinner box. c) rodent chamber. d) respondent behavior unit.