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Mean proportion (and standard error bars) of rats' responses during 30 training sessions to target stimuli in Experiment 1 (consonant and dissonant chords; black squares) and Experiment 2 (different sets of dissonant stimuli; white circles). A performance of 0.5 suggests no discrimination between stimuli. Rats successfully learned to discriminate consonant from dissonant chords, as well as between two sets of different dissonant stimuli.
