Encoding (psychology)

Encoding is the first stage of memory: the process of taking in information and converting it into a mental representation that can be stored and later retrieved. Without successful encoding, there is nothing to remember — many everyday "memory failures," like forgetting a name seconds after hearing it, are really encoding failures.

Psychologists distinguish several codes. Semantic encoding processes meaning, acoustic encoding processes sound, and visual encoding processes images. According to the levels-of-processing model, deeper processing produces more durable memories — thinking about what a word means (semantic) beats noticing what it sounds or looks like. Encoding can also be automatic (effortlessly registering familiar information like the route you drove) or effortful (deliberately studying material through attention and rehearsal).

Several strategies reliably strengthen encoding. Elaborative rehearsal — connecting new material to what you already know — outperforms rote repetition. Mnemonic devices, chunking, the spacing effect (distributed practice beats cramming), and the self-reference effect (relating information to yourself) all improve the odds that information gets encoded well enough to retrieve later. These findings are the scientific basis for most effective study techniques.

Encoding is a core topic in the cognition unit of AP Psychology, which tests the three-stage memory model, the types of encoding, automatic versus effortful processing, and the strategies that make encoding more effective.