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(A) Solo condition. Each monkey was individually trained on the BP task (‘Solo condition'). (B) Paired condition. The monkeys were tested (Test 1) in pairs immediately after learning the BP task. (C) Video play-back (vMonkey) condition. In order to manipulate the BP speed of a partner, and to control the auditory and visual characteristics of a partner, the partner was replaced by vMonkey (Tests 2 and 3).
