Response rate (responses/min) and Pellets earned per session in the final 5 sessions of both the Fixed Ratio 10 TO 20 s and Progressive Ratio experiments.

Data are expressed as group mean ±SEM. There were no significant differences attributable to either Age at treatment (adolescent vs. adult) or Treatment (CIE or saline).数据以组均值±标准误（Standard Error of the Mean，SEM）形式呈现。治疗时的年龄分组（青少年组vs.成年组）与处理方案（CIE或生理盐水）均未产生显著差异。