任务因素对二语习得和产出影响的研究现状

Researches on Task Factors' Influence on Second Language Acquisition and Production

任务因素在二语习得和产出中的作用主要表现为任务难度、任务复杂度和任务条件对二语学习者语言习得和产出的影响,而对学习者语言习得和产出表现的评价主要是测量语言产出的流利度、准确度和复杂度(CAF)。目前关于任务因素的研究在理论基础和研究方法上还有一定的局限性,亟需新的理论,如来自认知心理学方面的理论和假设的支持。任务难度、任务复杂度和任务条件的确定还有一定的困难,需要建立一个切实可行的评价模式。在测量方法方面,需要对CAF测量进一步完善,建立一个动态的、有机的语言产出测量模式。

Tasks have a role to play in the second language acquisition and production. Task difficulty, task com- plexity and task condition affect second language acquisition and production. Task performance of second language acqui- sition and production is measured in terms of complexity, accuracy and fluency （CAF）. Currently, the studies of task factors have some limitations in theories and research methods and need supports from cognitive psychology. There are some difficulties in evaluation of task difficulty, task complexity and task condition, and a feasible model is required to assess them. With respect to the method of measuring task performance, the CAF model needs further improvement to construct a dynamic and organic model of task performance measurement.