Effects of autonomy-supportive and controlling styles on situational self-determined motivation: some unexpected results of the commitment procedure.

Distinct and simultaneous effects of autonomy-supportive and controlling styles, usually considered as mutually exclusive, on situational self-determined motivation are tested. In Study 1, economics students (N = 100; 57 men, 43 women; M age = 21.5 yr.) were randomly assigned to one of the four experimental conditions (high vs. low) of autonomy supportive and/or controlling behaviors during a task. Results supported the independence of those constructs. An unexpected effect in regards to Self-determination Theory was found in the Low autonomy - High control condition in which self-determined motivation was observed. The interpretation for this specific condition, an effect due to the attempt to reduce cognitive dissonance triggered by the commitment procedure, was tested. In Study 2, sport students (N = 80, 44 men, 36 women; M age = 19.2 yr.) were randomly assigned to one of the three experimental conditions: No commitment, Commitment plus self-affirmation, and Commitment without self-affirmation. Results supported Study 1's interpretation: motivation was lower when participants were recruited without a commitment procedure or when they were invited to self-affirm than when participants recruited with a commitment procedure.