Science: Complexes

The boy was obviously frightened, not only because he was surrounded by sober-faced grownups, but because the strange equipment fastened to his arm and chest was, he knew, a "lie detector." The examiner asked him a few routine questions, then abruptly:

"Did you steal a car?"

"No."

The detector's graph showed, at this point, marked disturbance of breathing, pulse, blood pressure—presumptive evidence of a lie. Yet the lad was telling the truth. Patient questioning brought out that he had indeed not stolen a car, but that mention of "stealing" and "car" reminded him of...