Implicit Learning
Implicit learning is the acquisition of knowledge about the structure of a complex stimulus environment without intention to learn and without awareness of what has been learned (Reber, 1967). In SLA, it refers to the gradual, unconscious extraction of patterns and regularities from input through exposure and use, without the learner being able to verbalise the rules they have internalised.
Characteristics
- No awareness: The learner cannot articulate what they know — knowledge is tacit
- No intention: Learning occurs as a by-product of processing input for meaning
- Gradual: Builds up incrementally through repeated exposure to exemplars
- Statistical: The learner tracks distributional patterns, co-occurrences, and frequencies in the input
- Robust: Implicitly acquired knowledge tends to be durable and resistant to disruption
Implicit vs Incidental Learning
These terms are related but distinct:
| Implicit learning | Incidental Learning | |
|---|---|---|
| Awareness | No awareness of what is learned | May involve awareness of items but not intention to learn them |
| Focus | Pattern extraction without attention to form | Attention is on meaning; learning of form is a by-product |
| Example | Absorbing word order patterns from massive input | Learning a word's meaning from context while reading for pleasure |
Role in SLA
Implicit learning is widely considered the primary mechanism for first language acquisition, and its role in L2 acquisition is a central theoretical question:
Krashen's position: All meaningful L2 competence comes from implicit "acquisition"; explicit "learning" serves only as a monitor.
Usage-based approaches: Usage-Based Theory views implicit learning of statistical patterns in the input as the fundamental mechanism of language acquisition at all ages. Frequency, salience, and redundancy in the input drive what gets learned.
Emergentist view: Grammar emerges from implicit learning of associations between form and meaning across thousands of exemplars — no innate language-specific module required.
Constraints on Implicit L2 Learning
Implicit learning in L2 faces challenges that L1 does not:
- Reduced input quantity: L2 learners typically receive far less exposure than L1 children
- L1 entrenchment: Existing L1 patterns block noticing of novel L2 patterns (learned attention / blocking)
- Age effects: Implicit learning capacity may decline with age, particularly for phonology and morphology
- Low salience features: Grammatical morphemes with low communicative value (articles, third-person -s) may not be learned implicitly from input alone — see Input Enhancement
Teaching Implications
- Implicit learning requires massive, meaningful exposure — extensive reading and listening are powerful vehicles
- Input flooding (providing many exemplars of a target structure in meaningful contexts) supports implicit pattern extraction
- Explicit instruction may be needed for forms that implicit learning alone cannot reliably deliver
- The explicit–implicit learning distinction argues for a balanced approach: explicit instruction to bootstrap noticing, followed by communicative practice to promote implicit acquisition
References
- Reber, A.S. (1967). Implicit learning of artificial grammars. Journal of Verbal Learning and Verbal Behavior, 6(6), 855–863.
- Ellis, N.C. (2005). At the interface: Dynamic interactions of explicit and implicit language knowledge. Studies in Second Language Acquisition, 27(2), 305–352.
- Williams, J.N. (2005). Learning without awareness. Studies in Second Language Acquisition, 27(2), 269–304.