Professor Smith argues that his rats cannot learn to extinguish their operant responses because extinction trials do not seem radically different than training trials. Professor Smith's argument seemingly supports the:

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The discrimination hypothesis suggests that the failure of extinction learning may be due to the inability of the rats to differentiate between extinction and training trials. Professor Smith's argument aligns with this hypothesis as he suggests that the rats do not perceive the extinction trials as different enough from training trials to learn to extinguish their operant responses.

Professor Smith Argues That His Rats Cannot Learn to Extinguish