Language performance and language acquisition are the two

principle concerns of the psychology of language, or psycholinguistics. 【M1】________

The intensified study of psycholinguistics has produced a considerable

amount of literature and some significant advance in our understanding 【M2】________

of language acquisition. Surprisingly little fundamental research

has been conducted into the processes of learning a second language.

The consequence has been most theories in this field 【M3】________

are still extrapolating from general theories of human learning 【M4】________

and behavior or from the recent work in language performance and

acquisition. This is not to say that there has been no valuable

research on language teaching. But this has been concerned about 【M5】________

the evaluation of different teaching methods and materials, for

example, the use of language laboratories, the use of language drills,

the teaching of grammar by different methods.

Now, such research is difficult to evaluate, so experiments in 【M6】________

language teaching suffer from the same set of problems that all

comparative educational experiments suffer from. It is virtually

impossible to control all the factors involved in even if we know 【M7】________

how to identify them in the first place, particularly such factors as

motivation, previous knowledge, aptitude, learning outside the classroom,

teacher performance. Consequently the conclusions, to be drawn

from such experiments can, with confidence, be generalized to other 【M8】________

teaching situations. The results are, strictly spoken, only valid for the 【M9】________

learners, teachers and schools in what the experiment took place. 【M10】________

【M6】