This study related subjects' perceptions of their causality for task participation to their causal attributions of task outcomes, their task attitudes, and their task motivation. Subjects received success or failure feedback on a creativity task after experimental manipulations had influenced their perception of their causality for task participation as being of an extrinsic, social, or intrinsic source. Results indicated that subjects motivated by the intrinsic or social factor showed less ego-bias in their causal attributions than extrinsically-motivated subjects. Perceptions of intrinsic motivation were related to greater task motivation, enjoyment, and willingness to participate in a similar experiment. (Author)