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A dog learns to sit because the trainer's ear scratching then removes an itch. What is this?

APositive punishment
BPositive reinforcement
CNegative reinforcement
DNegative punishment
Answer & Solution
Correct answer: C. Negative reinforcement
1. Something undesirable (the itch) is removed after the behaviour. 2. Removal of an unpleasant thing to increase behaviour is negative reinforcement. 3. Positive reinforcement adds a reward, and punishments aim to reduce behaviour. _Source: Wikipedia, Learning, section Operant conditioning_
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