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Types of encoding include:

- Semantic encoding
- Visual encoding
- Acoustic encoding

Types of Encoding

Semantic encoding is the process of committing words and their meanings to memory. This form of encoding was first demonstrated in a 1935 experiment by William Bousfield, which showed that people tend to organize learned words based on their semantic categories during recall.

Semantic Encoding in Memory

Visual encoding is the process of converting images into memory. This process is particularly effective for concrete, high-imagery words (e.g., 'car', 'dog') because they can be encoded both visually, as mental pictures, and semantically, by their meaning. This dual encoding creates a stronger memory trace compared to abstract, low-imagery words (e.g., 'truth', 'value'), which are harder to visualize.

Visual Encoding in Memory

Acoustic encoding is the process of converting sounds into memory, with a particular emphasis on the sounds that make up words.

Acoustic Encoding in Memory

In a 1975 study, psychologists Fergus Craik and Endel Tulving investigated which type of encoding results in the best memory for verbal information. In their experiment, participants were shown words and asked questions designed to engage one of three processing levels. Visual processing was prompted by questions about the physical appearance of the letters (e.g., font), acoustic processing by questions about the word's sound (e.g., rhyming), and semantic processing by questions about the word's meaning. Afterward, participants were given a surprise recall or recognition test for the words.

Craik and Tulving's (1975) Experiment on Encoding Levels

A student is trying to memorize a list of vocabulary words for a test. They consider three different strategies. Strategy A is to repeatedly say the words and their definitions aloud. Strategy B is to create a mental image of what each word represents. Strategy C is to think of a sentence that uses each word correctly. Which strategy is likely to be the most effective for long-term recall, and why?

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