视觉工作记忆的巩固加工：时程、模式及机制

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龙芳芳, 李昱辰, 陈晓宇, 李子媛, 梁腾飞, 刘强(

)

辽宁师范大学脑与认知神经科学研究中心, 大连 116029

收稿日期:2018-09-28出版日期:2019-07-26发布日期:2019-06-25
通讯作者:刘强E-mail:lq780614@163.com

基金资助:* 国家自然科学基金(31571123)

Consolidation processing of visual working memory: Time course, pattern and mechanism

LONG Fangfang, LI Yuchen, CHEN Xiaoyu, LI Ziyuan, LIANG Tengfei, LIU Qiang(

)

Research Center of Brain and Cognitive Science, Liaoning Normal University, Dalian 116029, China

Received:2018-09-28Online:2019-07-26Published:2019-06-25
Contact:LIU Qiang E-mail:lq780614@163.com

摘要/Abstract

摘要： 在视觉工作记忆加工过程中, 对记忆项目的维持及操作需要将转瞬即逝的感觉输入转换为稳定的记忆表征, 这一加工过程被定义为视觉工作记忆巩固。鉴于巩固在视觉工作记忆中所起到的“门控”作用, 研究者们已经发展出多种研究范式对其可能涉及的运作机制进行探讨。然而, 在不同范式下所观察到的巩固时程存在较大差异, 其所遵循的巩固模式也尚不清晰。此外, 对于巩固所涉及的理论及神经机制亦存在不同的观点。通过对比不同范式的差异性及梳理各方的观点, 可以有效推动这些问题的解决。未来研究除了可以在多种范式下对巩固模式进行验证, 还可以探究注意在巩固中的作用, 以及项目熟悉性等因素会对巩固加工产生何种影响。

图/表 2

图1同时/序列呈现范式(李腾飞, 马楠, 胡中华, 刘强, 2017) 注：项目呈现时间(mt)是通过测量阈限时间以确定每名被试巩固一项记忆色块的最小时间。具体的操作方式是先让被试只进行序列呈现条件的实验, 呈现时间共有8种可能(8 ms、16 ms、33 ms、66 ms、133 ms、266 ms、533 ms和800 ms等概率随机呈现), 每种呈现时间各18次。分别计算被试在8种呈现时间条件下的反应正确率, 通过参数拟合, 选取能够使被试达到80%正确率所对应的时间作为正式实验中的记忆色块呈现时间。此外, 为了防止被试在测量阈限阶段对序列呈现存在练习效应, 同时要求被试完成相同试次的同时呈现任务, 其他条件与序列呈现条件相同, 但不进行统计分析。

图2eSTST模型(Wyble, Bowman, & Nieuwenstein, 2009)

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