Küper Kristina, Zimmer Hubert D
Aging Group, Leibniz Research Centre for Working Environment and Human Factors, Dortmund, Germany; Brain & Cognition Group, Department of Psychology, Saarland University, Saarbrücken, Germany.
Brain & Cognition Group, Department of Psychology, Saarland University, Saarbrücken, Germany.
Brain Cogn. 2018 Apr;122:17-25. doi: 10.1016/j.bandc.2018.01.006. Epub 2018 Jan 20.
It is still unclear which role the right hemisphere (RH) preference for perceptually specific and the left hemisphere (LH) bias towards abstract memory representations play at the level of episodic memory retrieval. When stimulus characteristics hampered the retrieval of abstract memory representations, these hemispheric asymmetries have previously only modulated event-related potential (ERP) correlates of recollection (late positive complex, LPC), but not of familiarity (FN400). In the present experiment, we used stimuli which facilitated the retrieval of abstract memory representations. With the divided visual field technique, new items, identical repetitions and color-modified versions of incidentally studied object pictures were presented in either the right (RVF) or the left visual field (LVF). Participants performed a memory inclusion task, in which they had to categorize both identically repeated and color-modified study items as 'old'. Only ERP, but not behavioral data showed hemispheric asymmetries: Compared to identical repetitions, FN400 and LPC old/new effects for color-modified items were equivalent with RVF/LH presentation, but reduced with LVF/RH presentation. By promoting the use of abstract stimulus information for memory retrieval, we were thus able to show that hemispheric asymmetries in accessing abstract or specific memory representations can modulate ERP correlates of familiarity as well as recollection processes.
在情景记忆检索层面，右半球（RH）对感知特定信息的偏好以及左半球（LH）对抽象记忆表征的偏向发挥何种作用仍不清楚。当刺激特征阻碍抽象记忆表征的检索时，这些半球不对称性此前仅调节了与回忆相关的事件相关电位（ERP）（晚期正复合波，LPC），而未调节与熟悉度相关的ERP（FN400）。在本实验中，我们使用了有助于抽象记忆表征检索的刺激。采用视野分离技术，将新物品、偶然学习的物体图片的相同重复版本和颜色修改版本呈现于右视野（RVF）或左视野（LVF）。参与者执行一项记忆包含任务，其中他们必须将相同重复和颜色修改的学习项目都归类为“旧的”。只有ERP而非行为数据显示出半球不对称性：与相同重复相比，颜色修改项目的FN400和LPC新旧效应在RVF/LH呈现时相当，但在LVF/RH呈现时减弱。通过促进使用抽象刺激信息进行记忆检索，我们因此能够表明，在获取抽象或特定记忆表征时的半球不对称性可以调节熟悉度以及回忆过程的ERP相关性。
