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Reward prediction error neurons implement an efficient code for reward 奖励预测误差神经元实现了奖励的高效代码
IF 21.2 1区 医学 Q1 NEUROSCIENCES Pub Date : 2024-06-19 DOI: 10.1038/s41593-024-01671-x
Heiko H. Schütt, Dongjae Kim, Wei Ji Ma
We use efficient coding principles borrowed from sensory neuroscience to derive the optimal neural population to encode a reward distribution. We show that the responses of dopaminergic reward prediction error neurons in mouse and macaque are similar to those of the efficient code in the following ways: the neurons have a broad distribution of midpoints covering the reward distribution; neurons with higher thresholds have higher gains, more convex tuning functions and lower slopes; and their slope is higher when the reward distribution is narrower. Furthermore, we derive learning rules that converge to the efficient code. The learning rule for the position of the neuron on the reward axis closely resembles distributional reinforcement learning. Thus, reward prediction error neuron responses may be optimized to broadcast an efficient reward signal, forming a connection between efficient coding and reinforcement learning, two of the most successful theories in computational neuroscience. This theoretical study shows that dopaminergic reward prediction error neurons encode experienced rewards efficiently, which explains four major aspects of the neural population. This efficient code can be learned with local updates for each neuron.
我们利用从感觉神经科学中借鉴的高效编码原理,得出了对奖赏分布进行编码的最佳神经群。我们的研究表明,小鼠和猕猴的多巴胺能奖赏预测误差神经元的反应在以下方面与高效编码相似:神经元的中点分布广泛,覆盖奖赏分布;阈值越高的神经元收益越高,调谐函数越凸,斜率越低;当奖赏分布较窄时,神经元的斜率越高。此外,我们还推导出了收敛到高效代码的学习规则。神经元在奖励轴上位置的学习规则与分布强化学习非常相似。因此,奖励预测误差神经元的反应可以通过优化来广播高效奖励信号,从而在高效编码和强化学习这两个计算神经科学领域最成功的理论之间建立联系。
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引用次数: 0
Author Correction: Brain clearance is reduced during sleep and anesthesia 作者更正:睡眠和麻醉期间大脑清除率降低。
IF 21.2 1区 医学 Q1 NEUROSCIENCES Pub Date : 2024-06-14 DOI: 10.1038/s41593-024-01698-0
Andawei Miao, Tianyuan Luo, Bryan Hsieh, Christopher J. Edge, Morgan Gridley, Ryan Tak Chun Wong, Timothy G. Constandinou, William Wisden, Nicholas P. Franks
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引用次数: 0
Medial entorhinal cortex mediates learning of context-dependent interval timing behavior 内侧内叶皮层介导依赖于上下文的间隔计时行为的学习
IF 21.2 1区 医学 Q1 NEUROSCIENCES Pub Date : 2024-06-14 DOI: 10.1038/s41593-024-01683-7
Erin R. Bigus, Hyun-Woo Lee, John C. Bowler, Jiani Shi, James G. Heys
Episodic memory requires encoding the temporal structure of experience and relies on brain circuits in the medial temporal lobe, including the medial entorhinal cortex (MEC). Recent studies have identified MEC ‘time cells’, which fire at specific moments during interval timing tasks, collectively tiling the entire timing period. It has been hypothesized that MEC time cells could provide temporal information necessary for episodic memories, yet it remains unknown whether they display learning dynamics required for encoding different temporal contexts. To explore this, we developed a new behavioral paradigm requiring mice to distinguish temporal contexts. Combined with methods for cellular resolution calcium imaging, we found that MEC time cells display context-dependent neural activity that emerges with task learning. Through chemogenetic inactivation we found that MEC activity is necessary for learning of context-dependent interval timing behavior. Finally, we found evidence of a common circuit mechanism that could drive sequential activity of both time cells and spatially selective neurons in MEC. Our work suggests that the clock-like firing of MEC time cells can be modulated by learning, allowing the tracking of various temporal structures that emerge through experience. The authors examine the role of medial entorhinal cortex (MEC) in learning complex timing behavior. MEC inactivation disrupts task learning, and MEC time cells display context-dependent dynamics that evolve over learning and predict timing behavior.
情节记忆需要对经验的时间结构进行编码,并依赖于内侧颞叶的大脑回路,包括内侧内侧皮层(MEC)。最近的研究发现了内侧颞叶皮层的 "时间细胞",这些细胞在完成时间间隔计时任务时会在特定时刻发射信号,共同覆盖整个计时周期。有人推测,MEC时间细胞可提供外显记忆所需的时间信息,但它们是否表现出编码不同时间背景所需的学习动力,目前仍不得而知。为了探索这个问题,我们开发了一种新的行为范式,要求小鼠区分时间情境。结合细胞分辨率钙成像方法,我们发现 MEC 时间细胞显示出与任务学习相关的神经活动。通过化学失活,我们发现 MEC 活动是学习情境依赖性时间间隔行为所必需的。最后,我们发现了一种共同的电路机制,它可以驱动 MEC 中时间细胞和空间选择性神经元的序列活动。我们的研究表明,MEC 时间细胞的时钟样发射可通过学习进行调节,从而跟踪通过经验产生的各种时间结构。
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引用次数: 0
Fear learning induces synaptic potentiation between engram neurons in the rat lateral amygdala 恐惧学习会诱导大鼠外侧杏仁核中刻画神经元之间的突触电位增强
IF 21.2 1区 医学 Q1 NEUROSCIENCES Pub Date : 2024-06-13 DOI: 10.1038/s41593-024-01676-6
Marios Abatis, Rodrigo Perin, Ruifang Niu, Erwin van den Burg, Chloe Hegoburu, Ryang Kim, Michiko Okamura, Haruhiko Bito, Henry Markram, Ron Stoop
The lateral amygdala (LA) encodes fear memories by potentiating sensory inputs associated with threats and, in the process, recruits 10–30% of its neurons per fear memory engram. However, how the local network within the LA processes this information and whether it also plays a role in storing it are still largely unknown. Here, using ex vivo 12-patch-clamp and in vivo 32-electrode electrophysiological recordings in the LA of fear-conditioned rats, in combination with activity-dependent fluorescent and optogenetic tagging and recall, we identified a sparsely connected network between principal LA neurons that is organized in clusters. Fear conditioning specifically causes potentiation of synaptic connections between learning-recruited neurons. These findings of synaptic plasticity in an autoassociative excitatory network of the LA may suggest a basic principle through which a small number of pyramidal neurons could encode a large number of memories. A sparsely connected network, organized in clusters, identified in the rat lateral amygdala shows potentiation between recruited neurons after fear conditioning. This implies a mechanism for encoding multiple memories with a small number of neurons.
外侧杏仁核(LA)通过增强与威胁相关的感觉输入来编码恐惧记忆,在此过程中,每个恐惧记忆片段会招募 10-30% 的神经元。然而,LA 内部的局部网络是如何处理这些信息的,以及它是否也在存储这些信息方面发挥作用,这些问题在很大程度上仍是未知数。在这里,我们使用体外 12 片钳和体内 32 个电极对恐惧条件反射大鼠的 LA 进行电生理记录,并结合活动依赖性荧光和光遗传标记和召回,确定了 LA 主要神经元之间以簇为单位的稀疏连接网络。恐惧调理特异性地引起了学习招募神经元之间突触连接的电位增强。这些关于LA自身兴奋网络中突触可塑性的发现可能暗示了一个基本原理,即少量锥体神经元可以编码大量记忆。
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引用次数: 0
Spatiotemporally selective astrocytic ATP dynamics encode injury information sensed by microglia following brain injury in mice 时空选择性星形胶质细胞 ATP 动态编码小鼠脑损伤后小胶质细胞感知到的损伤信息
IF 21.2 1区 医学 Q1 NEUROSCIENCES Pub Date : 2024-06-11 DOI: 10.1038/s41593-024-01680-w
Yue Chen, Pengwei Luan, Juan Liu, Yelan Wei, Chenyu Wang, Rui Wu, Zhaofa Wu, Miao Jing
Injuries to the brain result in tunable cell responses paired with stimulus properties, suggesting the existence of intrinsic processes that encode and transmit injury information; however, the molecular mechanism of injury information encoding is unclear. Here, using ATP fluorescent indicators, we identify injury-evoked spatiotemporally selective ATP dynamics, Inflares, in adult mice of both sexes. Inflares are actively released from astrocytes and act as the internal representations of injury. Inflares encode injury intensity and position at their population level through frequency changes and are further decoded by microglia, driving changes in their activation state. Mismatches between Inflares and injury severity lead to microglia dysfunction and worsening of injury outcome. Blocking Inflares in ischemic stroke in mice reduces secondary damage and improves recovery of function. Our results suggest that astrocytic ATP dynamics encode injury information and are sensed by microglia. The mechanisms regulating microglial response to brain injury are unclear. Here, the authors show that astrocytic ATP dynamics encode injury information and trigger microglia response affecting the tissue damage and recovery of function following injury in mice.
大脑损伤会导致与刺激特性相匹配的可调细胞反应,这表明存在编码和传递损伤信息的内在过程;然而,损伤信息编码的分子机制尚不清楚。在这里,我们利用 ATP 荧光指示剂,在成年雌雄小鼠体内鉴定了损伤诱发的时空选择性 ATP 动力--Inflares。Inflares由星形胶质细胞主动释放,是损伤的内部表征。Inflares通过频率变化在其群体水平上编码损伤强度和位置,并由小胶质细胞进一步解码,驱动其激活状态的变化。Inflares与损伤严重程度不匹配会导致小胶质细胞功能障碍和损伤结果恶化。在小鼠缺血性中风中阻断 Inflares 可减少继发性损伤并改善功能恢复。我们的研究结果表明,星形胶质细胞 ATP 动态编码损伤信息并被小胶质细胞感知。
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引用次数: 0
A shifting role of thalamocortical connectivity in the emergence of cortical functional organization 丘脑皮层连接在皮层功能组织出现过程中的作用转变
IF 21.2 1区 医学 Q1 NEUROSCIENCES Pub Date : 2024-06-10 DOI: 10.1038/s41593-024-01679-3
Shinwon Park, Koen V. Haak, Stuart Oldham, Hanbyul Cho, Kyoungseob Byeon, Bo-yong Park, Phoebe Thomson, Haitao Chen, Wei Gao, Ting Xu, Sofie Valk, Michael P. Milham, Boris Bernhardt, Adriana Di Martino, Seok-Jun Hong
The cortical patterning principle has been a long-standing question in neuroscience, yet how this translates to macroscale functional specialization in the human brain remains largely unknown. Here we examine age-dependent differences in resting-state thalamocortical connectivity to investigate its role in the emergence of large-scale functional networks during early life, using a primarily cross-sectional but also longitudinal approach. We show that thalamocortical connectivity during infancy reflects an early differentiation of sensorimotor networks and genetically influenced axonal projection. This pattern changes in childhood, when connectivity is established with the salience network, while decoupling externally and internally oriented functional systems. A developmental simulation using generative network models corroborated these findings, demonstrating that thalamic connectivity contributes to developing key features of the mature brain, such as functional segregation and the sensory-association axis, especially across 12–18 years of age. Our study suggests that the thalamus plays an important role in functional specialization during development, with potential implications for studying conditions with compromised internal and external processing. The thalamus is important for neocortical functional specialization. Here the authors show its shifting role in shaping large-scale functional organization during early life in humans, particularly in developing the internal–external cortical hierarchy.
皮层模式化原理是神经科学中一个长期存在的问题,但这一原理如何转化为人脑中的宏观功能特化在很大程度上仍是未知数。在这里,我们研究了静息态丘脑皮层连通性的年龄依赖性差异,以探讨其在生命早期大规模功能网络出现过程中的作用,研究主要采用横断面方法,但也有纵向方法。我们的研究表明,丘脑皮层在婴儿期的连通性反映了感觉运动网络的早期分化以及受基因影响的轴突投射。到了儿童期,这种模式发生了变化,与突出网络建立了连接,同时外部和内部导向的功能系统脱钩。利用生成网络模型进行的发育模拟证实了这些发现,证明丘脑连接有助于发育成熟大脑的关键特征,如功能分离和感觉-联想轴,尤其是在12-18岁期间。我们的研究表明,丘脑在发育过程中的功能特化中扮演着重要角色,这对研究内部和外部处理受损的情况具有潜在意义。
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引用次数: 0
Boosting children’s cognitive control does not result in behavioral or neural changes 增强儿童的认知控制能力不会导致行为或神经变化
IF 21.2 1区 医学 Q1 NEUROSCIENCES Pub Date : 2024-06-07 DOI: 10.1038/s41593-024-01674-8
Cognitive control is crucial for present and future success and therefore is a frequent target of interventions. This study showed that training cognitive control in a large sample of 6–13-year-old children did not lead to any behavioral or neural changes, either immediately or 1 year after training.
认知控制对现在和未来的成功至关重要,因此经常成为干预的目标。这项研究表明,对大量 6-13 岁儿童进行认知控制训练后,无论是立即还是一年后,他们的行为或神经都没有发生任何变化。
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引用次数: 0
Developmental origin of oligodendrocytes determines their function in the adult brain 少突胶质细胞的发育起源决定其在成人大脑中的功能
IF 21.2 1区 医学 Q1 NEUROSCIENCES Pub Date : 2024-06-07 DOI: 10.1038/s41593-024-01666-8
Sarah Foerster, Elisa M. Floriddia, David van Bruggen, Petra Kukanja, Bastien Hervé, Shangli Cheng, Eosu Kim, Benjamin U. Phillips, Christopher J. Heath, Richa B. Tripathi, Cody Call, Theresa Bartels, Katherine Ridley, Björn Neumann, Laura López-Cruz, Abbe H. Crawford, Cian J. Lynch, Manuel Serrano, Lisa Saksida, David H. Rowitch, Wiebke Möbius, Klaus-Armin Nave, Matthew N. Rasband, Dwight E. Bergles, Nicoletta Kessaris, William D. Richardson, Timothy J. Bussey, Chao Zhao, Gonçalo Castelo-Branco, Robin J. M. Franklin
In the mouse embryonic forebrain, developmentally distinct oligodendrocyte progenitor cell populations and their progeny, oligodendrocytes, emerge from three distinct regions in a spatiotemporal gradient from ventral to dorsal. However, the functional importance of this oligodendrocyte developmental heterogeneity is unknown. Using a genetic strategy to ablate dorsally derived oligodendrocyte lineage cells (OLCs), we show here that the areas in which dorsally derived OLCs normally reside in the adult central nervous system become populated and myelinated by OLCs of ventral origin. These ectopic oligodendrocytes (eOLs) have a distinctive gene expression profile as well as subtle myelination abnormalities. The failure of eOLs to fully assume the role of the original dorsally derived cells results in locomotor and cognitive deficits in the adult animal. This study reveals the importance of developmental heterogeneity within the oligodendrocyte lineage and its importance for homeostatic brain function. Here the authors show that ventrally derived oligodendrocytes (OLs) can myelinate areas usually populated by dorsally derived OLs but cannot functionally compensate, as animals populated only by ventrally derived OLs show locomotor and cognitive deficits.
在小鼠胚胎前脑中,发育不同的少突胶质细胞祖细胞群及其后代少突胶质细胞从三个不同的区域出现,其时空梯度从腹侧到背侧。然而,这种少突胶质细胞发育异质性的功能重要性尚不清楚。利用基因策略消减背侧来源的少突胶质细胞系细胞(OLCs),我们在本文中展示了成年中枢神经系统中背侧来源的 OLCs 通常所在的区域会被腹侧来源的 OLCs 所填充和髓鞘化。这些异位少突胶质细胞(eOLs)具有独特的基因表达谱以及细微的髓鞘化异常。异位少突胶质细胞无法完全承担原始背侧来源细胞的作用,导致成年动物出现运动和认知障碍。这项研究揭示了少突胶质细胞系内发育异质性的重要性及其对大脑平衡功能的重要性。
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引用次数: 0
In conversation with Aniruddha Das 与阿尼鲁达-达斯对话
IF 25 1区 医学 Q1 Neuroscience Pub Date : 2024-06-07 DOI: 10.1038/s41593-024-01662-y
George Inglis
To celebrate Pride month in the USA, Nature Neuroscience is having conversations with LGBTQIA+ scientists across multiple career stages to discuss their personal and professional experiences in research. In this Q&A, we are talking to Aniruddha Das, an associate professor at Columbia University, New York, USA. Das’s research uses macaque models to explore the cognitive basis of visual processing, attention, and motivation.
为了庆祝美国的骄傲月,《自然-神经科学》杂志将与处于不同职业阶段的 LGBTQIA+ 科学家进行对话,讨论他们在研究中的个人和职业经历。在本期问答中,我们将与美国纽约哥伦比亚大学副教授阿尼鲁达-达斯(Aniruddha Das)进行对话。达斯的研究使用猕猴模型来探索视觉处理、注意力和动机的认知基础。
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引用次数: 0
In conversation with Alexandra Keinath 与亚历山德拉-凯纳特对话
IF 25 1区 医学 Q1 Neuroscience Pub Date : 2024-06-07 DOI: 10.1038/s41593-024-01661-z
George Inglis
To celebrate Pride month in the USA, Nature Neuroscience is having conversations with LGBTQIA+ scientists across multiple career stages to discuss their personal and professional experiences in research. In this Q&A, we are talking to Alexandra Keinath, an assistant professor at the University of Illinois, Chicago, USA. Keinath’s research uses both rodent and human models to investigate the neural representations of spatial memory and navigation.
为了庆祝美国的骄傲月,《自然-神经科学》杂志将与处于不同职业阶段的 LGBTQIA+ 科学家进行对话,讨论他们在研究中的个人和职业经历。在本期问答中,我们将与美国伊利诺伊大学芝加哥分校的助理教授亚历山德拉-凯纳特(Alexandra Keinath)进行对话。Keinath 的研究使用啮齿动物和人类模型来研究空间记忆和导航的神经表征。
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引用次数: 0
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Nature neuroscience
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