After learning that her new college roommate had experienced several episodes of depression during her high school years, erin incorrectly perceived her roommate's laughter as artificial and phony. this best illustrates the impact of

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Erin's reaction best illustrates the impact of a perceptual set. Because of the person's expectations, they only perceive certain things, and ignore conflicting bits of data. Erin's roommate may have been on medication, or found a joke legitimately funny- many depressed people can still experience humor.