Section: AP Psychology

6) When people are asked to recall a list of words they had earlier memorized, they often substitute synonyms for some of the words on the original list. This best illustrates the effects of: 

1. implicit memory.
2. source amnesia.
3. semantic encoding.
4. memory decay.
5. state-dependent memory.

Semantic encoding is a specific type of encoding where the meaning of something is encoded as opposed to the sound or vision of it.  This could attribute to substituting synonyms for words on a list because they have the same meaning, and that meaning is what has been stored in the brain.