Memory-related eye movements challenge behavioral measures of pattern completion and pattern separation.
Memory-related eye movements challenge behavioral measures of pattern completion and pattern separation.
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DOI：
10.1002/hipo.22256
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发表时间：
2014-06
期刊：
影响因子：
3.5
通讯作者：
Ally, Brandon A.
中科院分区：
文献类型：
--
作者：
Molitor, Robert J.;Ko, Philip C.;Hussey, Erin P.;Ally, Brandon A.
海马体通过一种称为模式分离的过程，从高度相似的事件中产生不同的情节，并通过一种称为模式完成的过程，从部分或退化的线索中检索记忆。这些过程已经在人类中进行了研究，参与者必须将研究项目与感知上相似的诱饵项目区分开来。对诱饵的错误警报（错误地报告了先前研究中感知上相似的项目）被认为反映了模式完成，这是一个基于检索的过程。然而，对诱饵的错误警报也可能是由于对研究项目的编码不足，导致对项目细节的记忆不足，无法正确拒绝诱饵。本研究通过比较被试在最初呈现项目时的眼球运动和随后呈现重复项目和类似诱饵时的眼球运动，分别考察了记忆加工在编码和提取过程中的作用，从而探讨了诱饵误报的来源。与其他反应类型相比，诱饵假警报与最初研究项目的注视较少相关，这表明假警报是由于编码不足造成的。此外，引诱正确的拒绝和引诱错误的警报获得了比命中更多的关注，这表明额外的检索相关处理。结果表明，行为范式中模式分离和模式完成的度量不是过程纯粹的。
The hippocampus creates distinct episodes from highly similar events through a process called pattern separation and can retrieve memories from partial or degraded cues through a process called pattern completion. These processes have been studied in humans using tasks where participants must distinguish studied items from perceptually similar lure items. False alarms to lures (incorrectly reporting a perceptually similar item as previously studied) are thought to reflect pattern completion, a retrieval-based process. However, false alarms to lures could also result from insufficient encoding of studied items, leading to impoverished memory of item details and a failure to correctly reject lures. The current study investigated the source of lure false alarms by comparing eye movements during the initial presentation of items to eye movements made during the later presentation of item repetitions and similar lures in order to assess mnemonic processing at encoding and retrieval, respectively. Relative to other response types, lure false alarms were associated with fewer fixations to the initially studied items, suggesting that false alarms result from impoverished encoding. Additionally, lure correct rejections and lure false alarms garnered more fixations than hits, denoting additional retrieval-related processing. The results suggest that measures of pattern separation and completion in behavioral paradigms are not process-pure.
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