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Theoretical distinction between functional states in working memory and their corresponding neural states
Visual Cognition ( IF 1.875 ) Pub Date : 2020-09-24 , DOI: 10.1080/13506285.2020.1825141
Mark G. Stokes 1 , Paul S. Muhle-Karbe 1 , Nicholas E. Myers 1
Affiliation  

ABSTRACT

Working memory (WM) is important for guiding behaviour, but not always for the next possible action. Here we define a WM item that is currently relevant for guiding behaviour as the functionally “active” item; whereas items maintained in WM, but not immediately relevant to behaviour, are defined as functionally “latent”. Traditional neurophysiological theories of WM proposed that content is maintained via persistent neural activity (e.g., stable attractors); however, more recent theories have highlighted the potential role for “activity-silent” mechanisms (e.g., short-term synaptic plasticity). Given these somewhat parallel dichotomies, functionally active and latent cognitive states of WM have been associated with storage based on persistent-activity and activity-silent neural mechanisms, respectively. However, in this article we caution against a one-to-one correspondence between functional and activity states. We argue that the principal theoretical requirement for active and latent WM is that the corresponding neural states play qualitatively different functional roles. We consider a number of candidate solutions, and conclude that the neurophysiological mechanisms for functionally active and latent WM items are theoretically independent of the distinction between persistent activity-based and activity-silent forms of WM storage.



中文翻译:

工作记忆中的功能状态与其相应的神经状态之间的理论区别

摘要

工作记忆(WM)对于引导行为很重要,但并不总是对下一个可能的动作有用。在这里,我们将当前与指导行为相关的WM项目定义为功能“活动”项目。WM中维护但与行为不立即相关的项目在功能上被定义为“潜在”。WM的传统神经生理学理论提出,内容是通过持续的神经活动(例如稳定的吸引子)来维持的。但是,最近的理论强调了“沉默活动”机制(例如短期突触可塑性)的潜在作用。鉴于这些平行的二分法,WM的功能活跃和潜在认知状态分别与基于持久活动和沉默活动的神经机制的存储有关。然而,在本文中,我们警告不要在功能状态和活动状态之间一一对应。我们认为主动和潜在WM的主要理论要求是相应的神经状态在质上起着不同的功能作用。我们考虑了许多候选解决方案,并得出结论,功能上活跃和潜在的WM项目的神经生理学机制在理论上独立于WM存储的持久性基于活动和沉默的形式之间的区别。

更新日期:2020-09-24
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