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'''Intrusion errors''' refer to when information that is related to the theme of a certain memory, but was not actually a part of the original episode, become associated with the event.<ref name="Jacobs">Jacobs, D. (1990). Intrusion errors in the figural memory of patients with Alzheimer’s and Huntington’s disease. ''Archives of Clinical Neuropsychology, 5'', 49–57.</ref> This makes it difficult to distinguish which elements are in fact part of the original memory. One idea regarding how intrusion errors work is due to a lack of recall inhibition, which allows irrelevant information to be brought to awareness while attempting to remember.<ref name="Stip">Stip, E., Corbière, M., Boulay, L. J., Lesage, A., Lecomte, T., Leclerc, C., Richard, N., Cyr, M., & Guillem, F. (2007). Intrusion errors in explicit memory: Their differential relationship with clinical and social outcome in chronic schizophrenia. ''Cognitive Neuropsychiatry, 12''(2), 112–127</ref> Another possible explanation is that intrusion errors result from a lack of new context integration into a viable memory trace, or into an already existing memory trace that is related to the appropriate memory.<ref name="Stip"/> More explanations involve the temporal aspect of recall, meaning that as the time difference between the study periods of different lists approaches zero, the amount of intrusions between the lists tends to increase,<ref name="Kahana">Kahana et al. (2006). Temporal Associations and Prior list intrusions in Free Recall.</ref> the semantic aspect, meaning that the list of target words may have induced a false recall of non-target words that happen to have a similar or same meaning as the targets,<ref>Smith, Troy, A., Kimball, Daniel, R. Kahana, Michael, J. (2007). The fSAM Model of False Recall.</ref> and the similarity aspect, for example subjects who were given list of letters to recall were likely to replace target vowels with non-target vowels.<ref name=Wickelgren>Wickelgren, Wayne, A., (1965. Similarity and Intrusions in Short Term Memory for Consonant-Vowel Digrams.</ref>
Intrusion errors can be divided into two categories. The first are known as '''extra-list errors''', which occur when incorrect and non-related items are recalled, and were not part of the word study list.<ref name="Stip"/> These types of intrusion errors often follow the DRM Paradigm effects, in which the incorrectly recalled items are often thematically related to the study list one is attempting to recall from. Another pattern for extra-list intrusions would be an acoustic similarity pattern, this pattern states that targets that have a similar sound to non-targets may be replaced with those non-targets in recall.<ref name="Wayne">Wickelgren, Wayne, A., (1965). Acoustic Similarity and Intrusion Errors in Short Term Memory.</ref> One major type of extra-list intrusions is called the "Prior-List Intrusion" (PLI), a PLI occurs when targets from previously studied lists are recalled instead of the targets in the current list. PLIs often follow under the temporal aspect of intrusions in that since they were recalled recently they have a high chance of being recalled now.<ref name="Kahana"/> The second type of intrusion error is known as '''intra-list errors''', which is similar to extra-list errors, except it refers to irrelevant recall for items that were on the word study list.<ref name="Stip"/> Although these two categories of intrusion errors are based on word list studies in laboratories, the concepts can be extrapolated to real-life situations. Also, the same three factors that play a critical role in correct recall (recency, temporal association and semantic relatedness) play a role in intrusions as well
===Time-slice errors===
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