Using light stimulation to establish habitual lever-pressing behavior in mice: validation of an operant model

Researchers validated an operant conditioning model where mice learn to press levers for light stimulation independent of hunger or typical reward responses, providing a translational model for studying behavioral addictions and compulsive behavior patterns. Results demonstrated that response-contingent light acts as a reinforcer establishing discrimination and persistent responding, with the effect specific to green light wavelength and contingent delivery rather than non-contingent light exposure.