3Ryan, R M, &Deci, E L. Self-determination Theory and the Facilitation of Intrinsic Motivation, Social Development, and Well-being[J]. American Psychologist, 2000,55:70.
6Dozier, R W Fear itself [M]. New York: Thomas Dunne Books. 1998:139-153.
7Ashby, F O , Isen, A M, & Turken, A U. A Neuropsy chological Theory of Positive Affect and its Influence on Cognition[J]. Psychological Bulletin, 1999,106 : 529- 550.
