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The authors investigated 3 commonly cited experiential qualities to propose a model of the essential nature of perceived self-determination in intrinsic motivation-internal locus, volition, and perceived choice. In 3 studies, they used structural equation modeling to compare a series of nested models in which 1, 2, or all 3 of these qualities were used to identify the best fitting conceptual model. Results consistently supported the model in which internal locus and volition, but not perceived choice, constitute valid indicators of self-determination. In light of the findings, the authors proposed a modified definition for perceived self-determination and discussed the conundrum of choice by proposing the conditions under which teachers can (and cannot) expect choice to increase students' intrinsic motivation.

The PRP was effective in detecting prodromal symptoms of relapse early in an episode. Crisis intervention including increased antipsychotic medication use during the prodromal phase reduced relapse and rehospitalization rates.

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In Study 1, participants who read about an extrinsically motivated target expected that task engagement would be less enjoyable and associated with less positive affect and that there would be poorer quality of interpersonal relations, compared with participants reading about an intrinsically motivated target. These effects were reversed when additional information disconfirmed initial perceptions of the target's motivation. In Study 2, participants who were taught a skill by an extrinsically motivated (paid) target reported lower interest in learning and lower task enjoyment than those taught by an intrinsically motivated (volunteer) target, despite receiving identical lessons and learning to the same criterion level. Lower levels of interest, task enjoyment, and positive mood "infected" a second learner when the first participant attempted to teach him or her the same skill. Results support a model linking social perception, expectancy formation, and motivational orientations toward activities.