Rosenthal and Fode's "maze-dull" rats (1963) had been bred to be particularly slow learners.

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Rosenthal and Fode's experiment in 1963 did not involve rats bred to be slow learners. Instead, they manipulated the expectations of the experimenters by telling them that some rats were bred to be "maze-bright" and others "maze-dull," despite all rats being randomly selected and not genetically predisposed to learning differences.

Rosenthal and Fode's "Maze-Dull" Rats (1963) Had Been Bred to Be