Depth of Processing
The Levels of Processing framework (Craik & Lockhart, 1972) proposes that memory retention depends not on where information is stored but on how deeply it is processed during encoding. Deeper cognitive engagement — semantic analysis, personal connection, elaboration — produces more durable memory traces than shallow processing such as repetition or copying.
The Processing Continuum
Craik and Lockhart described a continuum from shallow to deep:
| Level | Processing type | Example (vocabulary) | Retention |
|---|---|---|---|
| Structural | Physical/visual features | "Is OBSTINATE written in capitals?" | Weakest |
| Phonological | Sound properties | "Does obstinate rhyme with passionate?" | Moderate |
| Semantic | Meaning and connections | "Does obstinate mean the same as stubborn?" | Strongest |
Craik and Tulving (1975) confirmed experimentally that semantic processing produced significantly better recall than structural or phonological processing.
Application to SLA
The framework has profound implications for language teaching and learning:
Vocabulary acquisition: Tasks that require learners to process words at a semantic level — defining, using in sentences, comparing with synonyms, making personal connections — lead to better retention than tasks involving only copying, repetition, or matching form to translation.
Noticing and attention: Depth of processing connects to Schmidt's Noticing Hypothesis — forms must be consciously noticed to be acquired. But noticing alone is shallow; what matters is what the learner does with what they notice. Elaborative processing (connecting the noticed form to meaning, context, and prior knowledge) drives acquisition.
Incidental Learning: Even without intentional study, deep processing during communicative tasks can lead to vocabulary acquisition — provided the learner engages with meaning rather than simply decoding surface form.
The Involvement Load Hypothesis
Laufer and Hulstijn (2001) extended Craik and Lockhart's framework specifically for L2 vocabulary learning. They proposed that retention is a function of three components:
| Component | Definition | Example |
|---|---|---|
| Need | Motivation to process the word | Required for task completion |
| Search | Effort to find meaning or form | Looking up a word in a dictionary |
| Evaluation | Comparing the word with other words or contexts | Choosing the right word to complete a sentence |
Tasks with higher involvement load (more need, search, and evaluation) produce better retention.
Teaching Implications
- Copying vocabulary lists is shallow processing — low retention expected
- Tasks that require semantic engagement (gap-fills with choices, sentence completion, discussion of meaning) promote deeper processing
- Personal elaboration ("Write a sentence about your own experience using this word") maximises depth
- Learning strategies that involve organisation, association, and elaboration (e.g., cognitive strategies) are effective precisely because they increase processing depth
- The framework supports spending more time on fewer items processed deeply rather than shallow exposure to many items
References
- Craik, F.I.M. & Lockhart, R.S. (1972). Levels of processing: A framework for memory research. Journal of Verbal Learning and Verbal Behavior, 11(6), 671–684.
- Craik, F.I.M. & Tulving, E. (1975). Depth of processing and the retention of words in episodic memory. Journal of Experimental Psychology: General, 104(3), 268–294.
- Laufer, B. & Hulstijn, J. (2001). Incidental vocabulary acquisition in a second language: The construct of task-induced involvement. Applied Linguistics, 22(1), 1–26.