Antecedents Antecedent or antecedents in the field of Applied Behavior Analysis is defined as anything that happens right before the behavior occurs. Often recognizing the antecedent is very hard.  Examples of antecedents can be as simple as being told no to a favorite activity or item. Other times it may be a certain person enters the room.  Other times it may not be as obvious at all. It could be as small as there is cheese on the spaghetti and they did not want cheese on the spaghetti. Determining the antecedent is important to determine the function that the behavior

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