. The Japanese conducted medical experiments on Chinese and Russian prisoners of war during World War II--a common feature of state-sponsored, very organized genocide. What was especially awful, and somewhat unusual, about these experiments?
A. They used a type of water torture used to extract confessions.
B. They released the victims after performing the experiments.
C. The experiments required two people kill one another simultaneously.
D>The experiments involved surgery on live, conscious patients.

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answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.