Title: reinforcement Long Title: IUPAC Gold Book - reinforcement DOI: 10.1351/goldbook.12046 Status: current Definition Use of a stimulus in operant conditioning to increase the likelihood that a particular behavior will occur. Notes 1) Reinforcement may be positive (using a desirable stimulus) or negative (removing or withholding an adverse stimulus). 2) In contrast to reinforcement, use of stimuli to decrease a behavior is called punishment. Related Term - operant conditioning: https://goldbook.iupac.org//terms/view/11688 Source - PAC, 2015, 87, 841. 'IUPAC Glossary of terms used in neurotoxicology (IUPAC Recommendations 2015)' on page 901 (https://doi.org/10.1515/pac-2015-0103) Other Outputs - html: https://goldbook.iupac.org/terms/view/12046/html - json: https://goldbook.iupac.org/terms/view/12046/json - xml: https://goldbook.iupac.org/terms/view/12046/xml Citation: Citation: 'reinforcement' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.12046 License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. Collection: If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. Accessed: 2026-07-24T05:39:34+00:00