|Alternative Title||The Effect of Unitization on Associative Recognition and its Neural Mechanisms|
|Thesis Advisor||傅小兰 ; Hubert D. Zimmer|
|Place of Conferral||北京|
|Keyword||联结记忆 整合 熟悉性 回想 Erp|
研究二利用SPT 和VT 编码以操纵动作与物体的整合程度来考察整合编码对动作与物体的联结再认的影响。其次，再进一步考察动作与物体的实验前关联是否影响联结再认。学习阶段，被试使用SPT 与VT 编码方式识记日常动作短语(动作-物体对，如，“切西瓜”)(实验3)和怪异动作短语(如，“种锤子”)(实验4)；测试阶段，要求被试区分“相同”、“重组合”以及“新”短语。ERP 结果发现：
2)对于怪异短语：在SPT 和VT 编码条件，均存在“相同vs.新”的早期额区新旧效应及晚期顶区新旧效应。仅VT 编码条件，发现“相同vs.重组合”的晚期新旧效应。研究二结果表明对于日常动作短语，SPT 编码可以促进熟悉性与回想在联结再认的作用，从而提升联结记忆水平。仅在VT 编码下，怪异性可以促进熟悉性与回想在联结再认的作用，两者继而提高联结记忆成绩。
|Other Abstract||Dual process models of episodic recognition propose that two different cognitive processes–familiarity and recollection–can contribute to memory performances. Associative recognition is traditionally believed to be solely supported by ecollection. However, recent studies have challenged this view by demonstrating that familiarity can also contribute to associative recognition when to-be-remembered stimuli are perceived as a unitized representation. This is usually referred to as the “unitization hypothesis”. Our primary goal is to address this important issue in four event-related potential (ERP) studies in order to further understand the underlying mechanisms of associative recognition that closely related to everyday memory for actions and faces.|
Experiment 1 and Experiment 2 examined whether both familiarity and recollection could contribute to associative recognition of face features when faces are presented upright. In Experiment 1, participants studied upright and inverted faces consisting of internal features (specific mouth, nose, and eyes) paired with external features (specific hair, chin, and ears). During testing, participants were required to discriminate between intact, recombined and new faces. Recombined faces consisted of internal and external features taken from two different studied faces. Results revealed that early frontal old-new effects from comparisons of both “intact vs. new” and “intact vs. recombined” were observed in the upright but not inverted faces. In the inverted faces condition, we observed the late parietal old-new effect from comparison of “intact vs. new” (associated with recollection), but this effect was not observed in the upright faces condition. In Experiment 2, we presented only upright faces and improved memory via a more extensive learning phase. We replicated the early old-new effects for intact faces with respect to both new and recombined faces. With higher memory performance, the late parietal old-new effects were also observed. We take these results as further evidence for the contribution of familiarity to associative recognition if facial features are encoded as a coherent whole, as in upright faces.
In Experiment 3 and Experiment 4, we investigated whether familiarity could contribute to associative retrieval of action and object, when adopting SPT (self-performed task) during encoding. Additionally, we are also interested in whether the SPT effect and memory processes during associative recognition were influenced by the strength of the pre-existing associations between action and object. During study phase, participants studied ordinary action-object pairs (e.g., “cut the watermelon”) (Experiment 3) and bizarre phrases (e.g., “plant the hammer”) (Experiment 4) in the SPT or VT condition. At test, they discriminated between intact, recombined, or new pairs. ERP results revealed that: 1) For ordinary phrases, early frontal old-new effects from comparisons of “intact vs. new” and “intact vs. recombined” were observed after SPT, but not after VT. In both encoding conditions, late parietal old-new effects from comparisons of “intact vs. new” were observed; additionally, following SPT, late ERPs to intact phrases were more positive than recombined phrases. 2) For bizarre phrases, early frontal old-new effect from comparison of “intact vs. new” was observed after both SPT and VT encoding. We observed late parietal old-new effect from comparison of “intact vs. new” after both SPT and VT encoding; additionally, only after VT, late ERPs to intact phrases were more positive than recombined phrases for bizarre phrases. These results demonstrate that enactment in SPT encourages both familiarity and recollection during associative recognition of action and object for ordinary phrases, which further enhances recognition performance. Bizarreness encourages both familiarity and recollection only after VT encoding, which led to bizarreness effect in the VT condition.
Taken together, these findings reinforce the assumption that familiarity supports associative recognition during retrieval if a unitized representation was established during encoding.
|赵敏芳. 整合编码对联结再认的影响及其认知神经机制[D]. 北京. 中国科学院研究生院,2015.|
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