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===Implicit memory and levels-of-processing===
Implicit memory tests, in contrast with explicit memory tests, measure the recall value of a particular stimulus based on later performance on stimulus-related tasks. During these tasks, the subject does not explicitly recall the stimulus, but the previous stimulus still affects performance.<ref>{{Cite journal | volume = 45 | pages = 1043–1056 | last = Roediger | first = HL | title = Implicit memory: Retention without remembering | journal = American Psychologist | year = 1990 | doi = 10.1037/0003-066X.45.9.1043 | pmid = 2221571 | issue = 9 }}</ref> For example, in a word-completion implicit memory task, if a subject reads a list containing the word "dog", the subject provides this word more readily when asked for three-letter words beginning in "d". The levels-of-processing effect is only found for explicit memory tests. One study found that word completion tasks were unaffected by levels of semantic encodings achieved using three words with various levels of meaning in common.<ref>{{Cite journal | issn = 0002-9556 | volume = 102 | issue = 2 | pages = 151–181 | last = Schacter | first = DL |author2=McGlynn SM | title = Implicit memory: Effects of elaboration depend on unitization | journal = The American Journal of Psychology | year = 1989 | doi = 10.2307/1422950 | jstor = 1422950 | s2cid = 31679776 }}</ref> Another found that typical level-of-processing effects are reversed in word completion tasks; subjects recalled pictures pairs more completely if they were shown a word representing a picture rather than asked to rate a picture for pleasantness (semantic encoding).<ref>{{Cite journal | volume = 18 | issue = 6 | pages = 1251–1269 | last = Roediger | first = HL |author2=Stadler ML |author3=Weldon MS |author4=Riegler GL | title = Direct comparison of two implicit memory tests: word fragment and word stem completion | journal = Journal of Experimental Psychology: Learning, Memory, and Cognition | year = 1992 | doi = 10.1037/0278-7393.18.6.1251 | pmid = 1447550 }}</ref> Typical level-of-processing theory would predict that picture encodings would create deeper processing than lexical encoding.
"Memory over the short term and the long term has been thought to differ in many ways in terms of capacity, the underlying neural substrates, and the types of processes that support performance."<ref>{{cite journal | last1 = Rose | first1 = N. S. | last2 = Craik | first2 = F. M. | year = 2012 | title = A processing approach to the working memory/long-term memory distinction: Evidence from the levels-of-processing span task | url = https://openscholarship.wustl.edu/etd/300| journal = Journal of Experimental Psychology: Learning, Memory, and Cognition | volume = 38 | issue = 4| pages = 1019–1029 | doi = 10.1037/a0026976 | pmid = 22268911 }}</ref>
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