A week later, I returned to the training center to pick up the parrot. When Barron carried out the cage, the bird stood calmly in the center of its perch, its feathers neat and well-groomed, its eyes tranquil. It no longer cowered in the corner or trembled in fear."The results are excellent," Barron said. He clicked the clicker, and the parrot recited "I'm a good bird", then "I love my owner", and then "I don't bite".With a different signal, it said, "I'm sorry." It repeated the words softly but clearly, without any trace of reluctance."It has mastered exactly what you requested," Barron explained. "Now, it says 'I'm sorry' voluntarily more than 20 times a day without any prompting."I studied the parrot, and it met my gaze with empty gray eyes—no anger and no bitterness, just the hollow stillness of a bird that had been fully conditioned."Thank you, Barron.""My pleasure," Barron said. "However, I should mention that if the positive reinforcement is discontinued entire
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