Unconditionedย Reinforcerย refers to aย stimulusย that naturally increases the likelihood of aย behaviorย occurring in the future without the need for prior learning or pairing with other reinforcers. These reinforcers are inherently satisfying and do not require conditioning to beย effective.
Example
Food is an unconditionedย reinforcerย for a person who is hungry. Eating food naturally increases the likelihood of behaviors that lead to obtaining food in the future, without needing to learn that food is rewarding.