Vicary's claims that very quickly flashing phrases such as "eat popcorn" during a movie significantly improved popcorn sales. although this turned out to be a fraudulent claim, if it were true, it would be strong evidence of

Although this turned out to be a fraudulent claim, if it were true, it would be strong evidence of subliminal perception.

Explanation:

Subliminal perception takes place when a person is exposed to a stimulus, but the stimulus is too weak to be perceived consciously by that person. For some time, there were those who claimed that flashing phrases such as "eat popcorn" or "drink that brand of soda" very quickly during a movie would leave a footprint in people's brains. As a consequence, people would be influenced by the phrases and obey the order they gave. It turns out such hypothesis was refuted.

first of paragraph? and second of statment?

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i think the answer your looking for is

enforced