【正确答案】正确答案：For Bloomfield, linguistics is a branch of the positivistic brand of psychology known as "behaviourism". When the behaviourist methodology entered linguistics via Bloomfield's writings, the popular practice in linguistic studies was to accept what a native speaker says in his language and to discard what he says about it. This is because of the belief that a linguistic description was reliable when based on observation of unstudied utterances by speakers; it was unreliable if the analyst had resorted to asking speakers questions such as "Can you say ... in your language?"