削弱效应是否存在：工作场所中内外动机的关系

外部动机是否削弱内部动机？已有研究结论并不一致。澄清这一问题的有效途径是对外部动机的恰当分类。研究以165名企业员工为研究对象, 针对动机的动态性特点, 采用两时点纵向研究的方法, 以自我决定理论对外部动机的分类为基础, 探讨3种不同内化程度的外部动机--外在动机、内射动机和认同动机与内部动机的关系及外部动机内化程度与自主支持的关系。研究结果表明：(1)控制性、非内化的外部动机, 即外在动机和内射动机削弱员工的内部动机; (2)自主性、内化的外部动机, 即认同动机不会削弱员工的内部动机, 而是促进和保护内部动机; (3)自主支持环境促进员工外部动机内化的程度(即认同动机的增加)。最后, 研究对所取得结果的管理意义进行了讨论。     

Motivational interviewing as a way to promote physical activity in obese adolescents: A randomised-controlled trial using self-determination theory as an explanatory framework

Using self-determination theory (SDT) as an explanatory framework, this randomised-controlled study evaluates the effect of a motivational interviewing (MI)-based intervention as an addition to a standard weight loss programme (SWLP) on physical activity (PA) practice in obese adolescents over a six-month period. Fifty-four obese adolescents (mean age?=?13?years, mean BMI?=?29.57?kg/m²) were randomly assigned to an SWLP group (n?=?28) or SWLP?+?MI group (n?=?26). Both groups received two SWLP sessions, supplemented for the SWLP?+?MI group, by six MI sessions. Perceived autonomy support, perceived competence, motivational regulations, PA and BMI were assessed at baseline, three and six months (i.e. the end of the programme). MLM analyses revealed that compared to SWLP, the SWLP?+?MI group had a greater BMI decrease and a greater PA practice increase over time. Moreover, the SWLP?+?MI group reported greater autonomy support from medical staff at the end of the programme, greater increase in integrated and identified regulations and a stronger decrease in amotivation. MI appears as an efficient counselling method as an addition to an SWLP to promote PA in the context of pediatric obesity.