Negative reinforcement in the context of horse training refers to the removal or reduction of an aversive or uncomfortable stimulus to reinforce a desired behaviour. Negative reinforcement is a concept derived from operant conditioning - a type of learning where behaviours are strengthened or weakened by the outcomes that follow them. For example, applying a leg aid to ask the horse to walk on, and removing the aid when the horse does so. Operant conditioning relies on certain evolved tendencies