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You classically condition your dog Milo to salivate when middle C is played on the piano, but you find that he also salivates when middle C is played on the guitar. You make a point of playing C on the guitar and not giving Milo any food afterward, whereas you do sometimes give him food after you play C on the piano. After a few days, Milo stops salivating when C is played on the piano but continues to salivate when it is played on the piano. This phenomenon is known as __________.
What is stimulus discrimination?