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Krashen argues that comprehensible input is not enough to ensure language acquisition. Language learners also have to be receptive to that input. When learners are bored, angry, frustrated, nervous, unmotivated or stressed, they may not be receptive to language input and so they 'screen' the input. This screen is referred to as the AFFECTIVE FILTER. This suggests that when learners are bored, angry, frustrated, nervous, unmotivated or stressed, they may be unsuccessful at learning a second language. This has very practical implications for language teachers: lower their affective filters.
What is affective filter hypothesis?