Affective filter
The internal anxiety, fatigue, or boredom that blocks language input from reaching the parts of the brain that learn from it.
What it means
The affective filter is the third part of Krashen's hypothesis. The idea: even if a learner is exposed to comprehensible input, the input doesn't all reach the part of the brain that turns it into long-term language ability. Anxiety, low motivation, low self-confidence raise the filter. Calm, interest, and confidence lower it.
The filter isn't a literal organ. It's a metaphor for what teachers and learners both notice: the same lesson works differently on a relaxed Saturday afternoon than on a stressed Tuesday morning before a test.
Why it matters for reading
Reading a book you genuinely want to read keeps the filter low. The story carries you. You forget you're "studying."
Reading material chosen for you, on a topic you don't care about, in a graded reader written for the level above yours — that pushes the filter up. Even if the input is technically comprehensible, the brain isn't fully receiving it.
This is part of why "pick books you'd actually read in your own language" isn't a soft suggestion. It's a hard prerequisite. Material you're indifferent to barely sticks.
How to lower yours
- Pick books on topics that genuinely interest you.
- Read at a level where most sentences feel manageable. Constant frustration raises the filter.
- Skip difficult passages instead of grinding through them. Come back later.
- Don't read with someone else watching. Even a tutor can tighten things.