历史信息在学习过程中出现在大脑皮层中。

History information emerges in the cortex during learning.

机构信息

Department of Medical Neurobiology, Faculty of Medicine, The Institute for Medical Research Israel-Canada (IMRIC), The Hebrew University of Jerusalem, Jerusalem, Israel.

Brain Research Institute, University of Zurich, Zurich, Switzerland.

出版信息

Elife. 2023 Nov 3;12:e83702. doi: 10.7554/eLife.83702.

Abstract

We learn from our experience but the underlying neuronal mechanisms incorporating past information to facilitate learning is relatively unknown. Specifically, which cortical areas encode history-related information and how is this information modulated across learning? To study the relationship between history and learning, we continuously imaged cortex-wide calcium dynamics as mice learn to use their whiskers to discriminate between two different textures. We mainly focused on comparing the same trial type with different trial history, that is, a different preceding trial. We found trial history information in barrel cortex (BC) during stimulus presentation. Importantly, trial history in BC emerged only as the mouse learned the task. Next, we also found learning-dependent trial history information in rostrolateral (RL) association cortex that emerges before stimulus presentation, preceding activity in BC. Trial history was also encoded in other cortical areas and was not related to differences in body movements. Interestingly, a binary classifier could discriminate trial history at the single trial level just as well as current information both in BC and RL. These findings suggest that past experience emerges in the cortex around the time of learning, starting from higher-order association area RL and propagating down (i.e., top-down projection) to lower-order BC where it can be integrated with incoming sensory information. This integration between the past and present may facilitate learning.

摘要

我们从经验中学习,但将过去的信息纳入其中以促进学习的潜在神经元机制尚不清楚。具体来说,哪些皮层区域对与历史相关的信息进行编码,以及在学习过程中如何对这些信息进行调制?为了研究历史与学习之间的关系,我们在小鼠学习使用胡须区分两种不同纹理的过程中,连续对全皮层钙动力学进行成像。我们主要关注比较具有不同历史的相同试验类型,即不同的前一个试验。我们发现,在刺激呈现期间,桶状皮层(BC)中存在试验历史信息。重要的是,BC 中的试验历史仅在小鼠学习任务时才出现。接下来,我们还发现,在刺激呈现之前,在侧额(RL)联合皮层中出现了与学习相关的、依赖于试验历史的信息,而这种信息先于 BC 中的活动出现。试验历史也在其他皮层区域中被编码,与身体运动的差异无关。有趣的是,一个二进制分类器可以像在 BC 和 RL 中一样,在单个试验水平上区分试验历史和当前信息。这些发现表明,过去的经验是在学习的同时在皮层中出现的,从更高阶的 RL 关联区开始,并向下传播(即自上而下的投射)到低阶的 BC,在那里它可以与传入的感觉信息进行整合。过去和现在之间的这种整合可能促进了学习。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6197/10624423/fe954fc573df/elife-83702-fig1.jpg

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