Decoding load or selection in visuospatial working memory?

IF 2.9 2区心理学 Q2 NEUROSCIENCES

Psychophysiology Pub Date : 2024-06-22 DOI:10.1111/psyp.14636

Miriam Tortajada, Johannes J. Fahrenfort, Alejandro Sandoval‐Lentisco, Víctor Martínez‐Pérez, Lucía B. Palmero, Alejandro Castillo, Luis J. Fuentes, Guillermo Campoy, Christian N. L. Olivers

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Abstract

Flexible updating of information in Visual Working Memory (VWM) is crucial to deal with its limited capacity. Previous research has shown that the removal of no longer relevant information takes some time to complete. Here, we sought to study the time course of such removal by tracking the accompanying drop in load through behavioral and neurophysiological measures. In the first experimental session, participants completed a visuospatial retro‐cue task in which the Cue‐Target Interval (CTI) was manipulated. The performance revealed that it takes about half a second to make full use of the retro‐cue. In a second session, we sought to study the dynamics of load‐related electroencephalographic (EEG) signals to track the removal of information. We applied Multivariate Pattern Analysis (MVPA) to EEG data from the same task. Right after encoding, results replicated previous research using MVPA to decode load. However, especially after the retro‐cue, results suggested that classifiers were mainly sensitive to a selection component, and not so much to load per se. Additionally, visual cue variations, as well as eye movements that accompany load manipulations can also contribute to decoding. These findings advise caution when using MVPA to decode VWM load, as classifiers may be sensitive to confounding operations.

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视觉空间工作记忆中的解码负荷还是选择？

视觉工作记忆（VWM）中信息的灵活更新对于处理其有限的容量至关重要。以往的研究表明，删除不再相关的信息需要一定的时间才能完成。在这里，我们试图通过行为和神经生理学测量来跟踪伴随的负荷下降，从而研究这种删除的时间过程。在第一个实验环节中，参与者完成了一项视觉空间反向提示任务，在该任务中，提示-目标间隔（CTI）受到了操纵。实验结果表明，参与者需要大约半秒的时间才能充分利用回溯线索。在第二个环节中，我们试图研究与负荷相关的脑电图（EEG）信号的动态变化，以追踪信息的移除。我们将多变量模式分析（MVPA）应用于同一任务的脑电图数据。编码后，结果与之前使用 MVPA 对负荷进行解码的研究结果相同。然而，特别是在逆向提示之后，结果表明分类器主要对选择成分敏感，而对负荷本身并不那么敏感。此外，视觉线索的变化以及伴随负荷操作的眼球运动也会对解码产生影响。这些研究结果表明，在使用 MVPA 解码 VWM 负载时应小心谨慎，因为分类器可能对混淆操作很敏感。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Psychophysiology 医学-神经科学

CiteScore

6.80

自引率

8.10%

发文量

225

审稿时长

2 months

期刊介绍： Founded in 1964, Psychophysiology is the most established journal in the world specifically dedicated to the dissemination of psychophysiological science. The journal continues to play a key role in advancing human neuroscience in its many forms and methodologies (including central and peripheral measures), covering research on the interrelationships between the physiological and psychological aspects of brain and behavior. Typically, studies published in Psychophysiology include psychological independent variables and noninvasive physiological dependent variables (hemodynamic, optical, and electromagnetic brain imaging and/or peripheral measures such as respiratory sinus arrhythmia, electromyography, pupillography, and many others). The majority of studies published in the journal involve human participants, but work using animal models of such phenomena is occasionally published. Psychophysiology welcomes submissions on new theoretical, empirical, and methodological advances in: cognitive, affective, clinical and social neuroscience, psychopathology and psychiatry, health science and behavioral medicine, and biomedical engineering. The journal publishes theoretical papers, evaluative reviews of literature, empirical papers, and methodological papers, with submissions welcome from scientists in any fields mentioned above.

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