5Anderson J. Acquisition of cognitive skill[ J ]. Psychological Review, 1982, (89) :369 -406.
6Hanaoka O. Output, noticing, and learning: An investigation into the role of spontaneous attention to form in a four-stage writing task[ J ]. Language Teaching Research,2007, ( 11 ) :459 - 479.
7Izumi S. Output, input enhancement, and the noticing hypothesis [ J ]. Studies of Second Language Acquisi- tion, 2002, (24): 541 -577.
8Izumi S. Comprehension and production processes in second language learning : In search of the psycholinguistic rationale of the output hypothesis [ J]. Applied Linguistics, 2003, (24):168 -196.
9Krashen S. The Input Hypothesis: Issues and Implications[ M]. London: Longman, 1985.
10Levelt W. Speaking: From Intention to Articulation[ M]. Cambridge, MA: The MIT Press, 1989.
