Story:What is a clicker

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Clicker training
Clicker training is a positive reinforcement animal training method based on a bridging stimulus (the clicker) in operant conditioning.
Elf (Ellen Levy Finch) at en.wikipedia
Sometimes, instead of a click to mark the desired behavior, other distinctive sounds are made (such as "whistle, a click of the tongue, a snap of the fingers, or even a word") or visual or other sensory cues (such as a flashlight, hand sign, or vibrating collar), especially helpful for deaf animals.