Jack and Truman Are Participants in an Experiment

Jack and Truman are participants in an experiment. They sit before a computer screen that flashes words, each of which is exposed for different amounts of time. Their task is to say when they see a real word and to tell what that word was. Let's say Jack reports seeing the word "SEX" on the third trial, whereas Truman does not see "SEX" until the tenth trial. What does this finding reveal about Jack and Truman?

A) They may differ in their perceptual sensitivity.
B) They may differ in their decision criteria.
C) Jack sees more "false alarms" than does Truman.
D) Both a and b are correct answers.

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