近年来,得益于方法学的重大进步和从分子到全体大脑多层次的数字数据集成及建模,脑科学研究无疑已迈入一个新时期。在这一背景下,神经科学与技能、打算的交叉领域已取得主要进展。新兴的大脑科学整合了高质量的研究、多层次数据的集成、跨学科的大规模互助文化,同时促进了科研成果的运用转化。就如欧洲的“人脑操持”(Human Brain Project, HBP)所提倡的那样,采纳系统化的方法对付应对未来十年内的医学与技能寻衅至关主要。
本文旨在为未来十年的数字大脑研究发展一套新观点,并与广泛的研究社区展开谈论,探求共识点,以此确立科学的共同目标。同时,供应一个科学框架,支持当前及未来的EBRAINS研究根本举动步伐发展(EBRAINS是HBP事情产生的研究根本举动步伐)。此外,本文还旨在向利益干系者、帮助组织和研究机构传达未来数字大脑研究的信息,吸引他们的参与;磋商综合性大脑模型在人工智能,包括机器学习和深度学习方面的变革潜力;并概述一个包含反思、对话及社会参与的协作研究方法,以应对伦理与社会的机会与寻衅,作为未来神经科学研究的一部分。(本文为文章上篇)
关键词:人类大脑,数字研究工具,研究路线图,大脑模型,数据共享,研究平台

▷Amunts, Katrin, et al. \"大众The coming decade of digital brain research: A vision for neuroscience at the intersection of technology and computing.\公众 Imaging Neuroscience 2 (2024): 1-35.
弁言
在过去几十年里,我们对人脑的理解已取得显著进展。面对大脑繁芜性的寻衅,研究者已经从单一分子和基因的层面,到突触、细胞和局部神经回路,乃至于作为一个整体器官的大脑的各个层面,探索其多种功能和功能障碍。
本日,神经系统疾病已成为继心脏病之后的第二大去世亡缘故原由,造成约2.76亿伤残调度生命年(Disability-Adjusted Life-Years, 是指从发病到去世亡所丢失的全部康健寿命年)(Feigin et al., 2019)。[1]2010年,欧洲的大脑疾病总本钱高达 7980亿欧元 (Olesen et al., 2012)。为了应对这一寻衅并开拓更有效的因果治疗方法,我们须要深入理解大脑的事情事理。我们不可避免地会面临器官的繁芜性和其弘大的规模,同时也存在合法的伦理和方法论限定,这些限定不许可我们直接从人体材料中获取所有必要的数据集。这为实证和数字研究带来了寻衅。办理这些寻衅须要洞察大脑的根本构造、器官中的生理征象,以及对神经机制的理论理解。
结合构造性和功能性磁共振成像(fMRI)、脑磁图(MEG)或脑电图(EEG)等多种方法,科学家们已成功识别与觉得、运动掌握和实行功能干系的生物标志。然而,要从细胞机制到系统层面的效应建立联系,我们须要多尺度神经科学的支持。还有研究指出,我们还须要理解大脑各区域之间是如何进行“语义”互换的 (Douglas & Martin, 2007) 。例如,Buzsáki (2019) 认为,全局和局部的振荡构成了大脑内部通信的“语法”。
针对多种脑疾病,遗传机制的明确已对诊断和治疗起到了直接的主要浸染。此外,几种旗子暗记传导路子的分子和细胞机制也已被解码。只管如此,我们仍需加深对大脑组织、大脑构造与功能、动力学和行为之间关系的理解,特殊是其在学习和就寝期间的重组,以及认知根本的条件。仿照以及人工智能(AI)解析意识构造的潜力已成为神经科学谈论的一部分 (见 Dehaene et al., 2017; Graziano, 2019)。具备仿照意识能力的机器的涌现,可能意味着“意识的困难问题”可以通过仿照“意识的随意马虎问题”来办理 (Chalmers, 1995)。
大脑的多尺度架构不仅授予了它适应能力和打算能力,也匆匆成了不同大脑区域间明显的个体差异。这些差异的程度取决于不同大脑区域和其他成分 (Croxson et al., 2018; Zilles & Amunts, 2013)。理解这些变异将有助于改进诊断和个性化治疗,同时促进对认知功能机制的阐释。从根本科学的角度看,这是理解进化和不同认知特色的必要条件 (Thiebaut de Schotten & Forkel, 2022)。
神经成像技能、微电子技能和光学方法的创新进展,极大地推动了我们对大脑功能的理解。这些技能供应了更高的空间和韶光分辨率,并能持续不雅观测更永劫光,从而产生了大量的数据。目前已经有成千上万的参与者参与个中,他们供应了大量数据集,只管这些数据集的分辨率较低。这些数据帮助我们识别了决定大脑康健与朽迈的多种成分,例如生活办法、环境成分、基因构成及这些成分之间的相互浸染。这种实证研究产生了大量高度构造化的数据以及元数据,也加剧了对日益增长的对数据集的需求。
那么,根据目前的数据,哪些问题已经可以得到解答,哪些地方还须要做更多事情呢?2002年诺贝尔奖得主悉尼·布伦纳 (Sydney Brenner) 在其获奖演讲“大自然给科学的礼物”(Brenner,2003)中提到:“我们正在数据的海洋中挣扎,渴望得到知识。生物科学的爆炸性增长得益于我们积累描述性事实的前所未有的能力……我们须要将数据转化为知识,并须要一个框架来实现这一转换。”只管现有大量数据,但各实验室的研究目标和方法差异巨大,数据每每无法直接比较。此外,严格的质量掌握和来源追踪的多维数据,包括具有高空间和韶光分辨率的功能成像数据及组学数据等,还相对稀少。
这些数据每每来自多个不同的实验室。显然,要定义和实现宏伟的科学目标,须要不同领域的神经科学实验室之间,以及拥有互补技能专长的实验室之间的紧密互助。例如,须要图像剖析、神经解剖学、数据剖析、打算、生理学、生物医学、建模、理论和打算的专家共同协作。研究大脑和大脑疾病时,一些神经伦理问题和社会需求与代价的考量也非常主要,这匆匆使神经科学家与人文科学研究者之间的互动更加紧密。总的来说,这些发展促进了跨学科互助,须要适当组织和重视。
这种横跨不同大脑研究领域的紧密互助是HBP等大型国际项目的显著特点。[2]HBP从2013年启动至2023年结束,是欧洲未来与新兴技能领域的旗舰项目之一。HBP项目的启动目标是深入理解大脑,这一目标与当时打算和数字技能的显著进步符合(Amunts et al., 2016, 2019; Markram et al., 2011)。HBP是环球首批大规模大脑研究项目之一,在将数字大脑研究转变为一个更方便协作、可复制、以及伦理和社会任务为导向的学科方面发挥了首创性浸染(Amunts et al.,2022)。
HBP已经建立了科学事情流的根本,使得多尺度、多物种的实验数据与理论及数据驱动模型之间能进行FAIR(可查找的、可访问的、可互操作的、可重用的;Wilkinson et al.,2016)比较(Eriksson et al.,2016)。研究成果已经带来了关于学习机制(Bellec et al., 2020; Cramer et al., 2020; Deperrois et al., 2022; Göltz et al., 2021; Jordanet al.,2021;Masoli et al.,2021;Stöckl et al.,2021)、视觉-运动掌握 (Abadía et al., 2021; Pearson et al., 2021)、视觉(Chen et al., 2020; Svanera et al., 2021; van Vugt et al., 2018)、意识(Demertzi et al.,2019;Lee et al.,2022)、就寝(Capone et al.,2019;Le Van Quyen et al.,2016;Rosanova et al.,2018)、空间导航(Bicanski & Burgess,2018;Northoff et al.,2020;Stoianov et al.,2018;van Beest et al.,2018;et al.,2021)、预测编码和感知(Oude Lohuis et al.,2022),以及措辞(Dehaene et al., 2015)等方面的新见地,同时也推动了新理论观点和剖析方法的发展。Neuron杂志[3]在2015年的特刊中,特殊谈论了认知架构,旨在汇聚关键研究以理解和仿照人类大脑功能,许多特色论文都是在HBP项目启动阶段的互助成果(Dehaene et al., 2015)。
神经科学社区现在已经能够利用最新的打算、仿照和人工智能技能的最新发展。项目中创建的实验数据、打算模型和工具、仪器以及如神经形态系统这样的专用硬件,旨在显著加速大脑医学和研究的发展,并为半导体行业供应低能耗办理方案(“大数据须要硬件革命”,2018)。该同盟已经开拓出EBRAINS这一协作研究平台,目标是通过数字工具和打算技能将大脑研究推向新的高度,进一步发展医学和神经启示型技能的运用。EBRAINS已成为欧洲研究根本举动步伐计策论坛(ESFRI)路线图的一部分,ESFRI的目标是支持欧洲研究根本举动步伐政策的连贯和计策导向的方法,并促进多边倡议,以更好地利用和发展研究根本举动步伐,这不仅涵盖欧洲,还扩展到跨大陆层面。EBRAINS正在被开拓成为一个由科学家为科学家做事的可持续研究根本举动步伐。
为应对伦理与社会问题,HBP在EBRAINS的管理和研究层面融入了负任务研究与创新(RRI)的原则和实践。其目标是预测、反思,并在网络层面采纳行动,以应对当前及未来的神经伦理、哲学、社会和法律寻衅,并主动办理有关EBRAINS研究及其成果的关注、滥用和商业化的双重用场研究问题(Stahl et al., 2021)。
展望未来十年,我们基于已取得的造诣,确定了对大脑知识的缺口,并制订了未来的研究目标。我们相信,实现这些目标的努力将从数字大脑研究的进展以及技能与打算交叉领域的最新发展中受益。数字大脑研究利用数据科学、人工智能、打算、建模和仿照、图谱等领域的上风,推动大脑研究进展,并将其转化运用于医学和技能。这些目标也将从神经科学与神经伦理的整合以及涉及需求、可接管性和期望性的伦理与社会问题的多学科互助中获益。
本手稿通过一个参与性过程发展而来(附录1)。这项事情由HBP发起,约请全体研究社区通过提交评论共同塑造愿景。这个过程持续超过两年,使得原始文件经历了本色性的变更,研究观点得到更广泛的代表,有时还伴随着争议性的谈论,特殊是关于建模和仿照的角色。作者们就共同目标和实现这些目标的步骤达成了共识。虽然我们并不认为存在一种“万能”的方法来处理这些问题,但我们确信,环绕数字大脑研究主题的谈论将推动更广泛的神经科学领域的进展(见附录2)。
附录1 白皮书:参与流程和韶光表附录2 支持声明Rafael Yuste: “作为在美国事情的欧洲人,我强烈支持这一倡议,它有助于将欧洲神经科学推向领导地位,并帮助欧洲国家利用共同努力实现相同目标的好处。”
Linda Richards:“总体而言,这份手稿呈现了推动该领域提高的新方法,非常令人愉快。”
Alexandra A. de Sousa:“作为欧洲脑进化研究网络的创始人,我强烈支持这一倡议,特殊是它提到了比较和进化神经科学的主要性。”
蒲慕明:“理解人脑的构造和功能,并开拓有效的诊断和干预脑疾病的方法,是所有社会的长期目标。这些任务弘大,须要环球互助,以促进快速进展并共享知识与技能。中国脑科学项目现已由中国政府全额帮助,为未来十年供应保障。许多中国科学家与欧美科学家有密切联系,他们希望建立国际互助项目,并设立有效的协作机制。”
George Paxinos:“不雅观察到在多层次脑图谱的开拓中取得的进展,实在令人愉快。近年来涌现的高等数字工具为研究不同物种的大脑构造供应了全新的可能性。”
神经科学:现状为了理解我们的缺失落部分并勉励我们的数字大脑研究方法,回顾当代神经科学的出发点至关主要。这一学科的发展经历了多个关键阶段。
当代神经科学起源于19世纪的末了二十年,大脑的认识发生了根本性变革:从被视为构造单一的整体,转变为一个由浩瀚神经元组成的繁芜网络(DeFelipe, 2009; Mazzarello, 2010; Shepherd, 2015)。20 世纪初关于大脑分区的新观点,即大脑中卖力特定功能的区域,催生了微不雅观构造的大脑图谱的出身(例如,Brodmann, 1909; Vogt & Vogt, 1919)。系统的精力病理学研究加深了我们对康健和疾病状态下大脑的理解。1930 年代全脑电图为 1950 年代细胞内电生理记录以及对神经元和突触生理学的基本理解铺平了道路。1930 年代化学神经通报的创造及1950 年代药理学的革命对神经学和精神病学产生了重大影响(Carlsson et al., 1957; Dale et al., 1936; Vogt, 1954),同时也加深了我们对付大脑如何作为一个分布式打算网络灵巧适应变革天下的基本理解(Dayan, 2012)。
1950年代引入的Hodgkin-Huxley模型用数学术语描述了动作电位的机制(Hodgkin & Huxley, 1952)。到了1960年代和1970年代,关于觉得(紧张是视觉)和运动系统的生理学及解剖学研究,为我们更新对大脑的认识供应了宝贵见地。只管我们现在认识到这种理解还过于大略(Shepherd, 2009)。1980年代我们对神经元膜生物物理学和受体及离子通道的功能有了深刻的理解(Sakmann & Neher, 1984),而1990年代全脑成像技能的兴起开启了一个快速进展期,深化了我们对大脑构造、它与基因和环境的关系以及个体差异的理解。新兴技能,包括分子生物学、遗传学、药理学、生理物理学、神经成像和打算神经科学,结合电子和打算技能,逐步丰富了大脑研究(Finger, 1994)。
21 世纪初,新工具的开拓,如光遗传学,首次许可通过激活或抑制特定的神经元类型,来研究它们的功能(Deubner et al., 2019; Emiliani et al., 2022; Häusser, 2021; Südhof, 2017)。新型高分辨率成像技能,如在动物实验中利用的双光子钙成像,极大提高了我们对细胞和亚细胞生理的理解(Toi et al., 2022; Yang & Yuste, 2017)。与此同时,宽视野钙成像作为系统神经科学中的一种强大工具涌现,许可同时记录多个大脑区域,具有足够的时空分辨率来解析行为干系信息(Cardin et al., 2020; Ren & Komiyama, 2021b)。最近,单细胞转录组学的发展,结合电生理表征和形态重修,为研究职员供应了关于哺乳动物大脑中神经元类型的坚实知识根本(Chartrand et al., 2023; Fuzik et al., 2016; Gouwens et al., 2020; Lee et al., 2023)。
有人提出,刺激的全局特性可以通过神经元同步来编码的假设(Brama et al., 2015),例如“同步绑定”理论曾认为,当编码这些特色的神经元在毫秒内同时放电时,诸如视觉工具的颜色和运动之类的特色就会被整合为连贯的感知(Gray et al., 1989)。然而,后来的研究表明,并不存在同步绑定(Lamme & Spekreijse, 1998; Roelfsema et al., 2004; Thiele & Stoner, 2003),而是工具的特色通过基于工具的把稳力,在神经元层面长进步了放电率,从而整合成一个连贯的整体(Poort et al., 2012; Roelfsema et al., 1998)。未来几年内,我们可能将得到用于研究特界说务的动物大脑回路的毫秒级表征工具,这些工具将运用于海马-皮层网络(Klausberger & Somogyi, 2008; Lisman et al., 2017)、运动皮层(Li et al., 2015)、桶状皮层(Staiger & Petersen, 2021)、基底-皮层网络(Gombkoto et al., 2021)和一些组织性行为的下丘脑网络(Karigo et al., 2021)。
同时,我们对特定大脑功能的理论和观点理解也变得更为丰富和繁芜。现在可以在多个尺度上研究解剖与功能之间的联系(Zaborszky, 2021)。微不雅观尺度的形态学特色包括髓鞘、细胞、受体布局、细胞密度、突触、单个神经元的尖峰模式、轴突和树突的分枝模式、棘密度和基因表达,而生理特色涵盖从离子通道生物物理到突触电位或神经元尖峰模式的广泛范围。研究表明,特定区域的突触组织、受体布局和分枝模式揭示了惊人的连接繁芜性,虽然这些特色如何导致皮层内部和皮层之间以及区域内的处理差异仍旧是一个未解之谜(Amunts et al., 2020; Haueis, 2021; Palomero-Gallagher & Zilles, 2019; Rockland, 2022)。
在宏不雅观层面,研究者利用MRI技能探索大脑中各个皮质区域之间的相互联系,如视觉系统的层级处理和基本连接模式(Felleman & Van Essen, 1991)。在此尺度,大脑血氧水平依赖性(BOLD)旗子暗记展现出慢速、低频的自发颠簸和系统性模式,这些通过静息态功能连接被捕捉到(Raichle et al., 2001)。但是,BOLD成像与电生理模式之间的精确关系尚未明确。研究假设架构类型是层级处理的决定成分 (Barbas, 2015; Bastos et al., 2015; Mejias et al., 2016; Vezoli et al., 2021)。跨模态区域之间的连接使得这些区域能够整合不同单模态觉得的表征,归入到实行分类和规则决策的脑区(Mesulam, 1998; Pandya et al., 2015)。在连接区域之间以及区域内部,神经元的繁芜性方面已取得一定的研究进展。
详细来说,许多人类研究中利用的功能成像BOLD旗子暗记与局部能量花费密切干系 (Viswanathan & Freeman, 2007),这可能反响了映射到跨层神经元和皮质层的树突活动和中间神经元活动。这些局部的微电路和树突活动比拟较内部模型与自上而下的预期和自下而上的信息流的认知功能至关主要。这些局部打算对意识处理的细胞机制可能起到关键浸染 (Aru et al., 2020),并可能在其他丈量神经输出的电记录技能中被遗漏。理解特定层级打算将是一项主要的打算打破,结合对局部微电路活动和树突活动敏感的记录技能 (Larkum et al., 2018) 与相应的皮层打算理论模型 (Haider et al., 2021; Sacramento et al., 2018) 可实现此目标。
所谓的中不雅观尺度是在微电路层面上定义的,研究者依此描述大脑的不同细胞类型及其连接性和呈现的动力学。然而,详细的单元仍旧存在争议。只管在1970年代,多种尺寸的皮层柱(如微柱、超柱等)被视为功能模块 (Jones, 1983; Mountcastle, 1997; Rockland, 2010; Szentágothai, 1978),但持续的谈论提出了基本电路类型的组合,包括前馈愉快性、循环反馈愉快性、前馈抑制性、循环反馈抑制性和抑制-抑制性电路 (Nadasdy et al., 2006)。这些电路是通过进化压力塑造的。因此,理解不断进化和成熟的皮层电路逻辑,以便识别跨物种的特定电路,这将揭示解剖特色在多大程度上具有相似或不同的功能。
理解中不雅观尺度电路对付精确连接微不雅观和宏不雅观尺度的大脑组织描述至关主要,这有助于从微不雅观特色精确推断宏不雅观行为(Haueis, 2021)。广域荧光成像可以桥接微不雅观和宏不雅观空间尺度之间的神经活动,帮助我们理解局部电路是如何与更大的神经网络相互浸染的 (Cardin et al., 2020; Ren & Komiyama, 2021a)。通过结合不同记录办法,我们能够打破单一技能的局限性(Allegra Mascaro et al., 2015),例如,最近的研究结合广域钙成像与其他成像技能,如双光子钙成像和 fMRI (Barson et al., 2020; Lake et al., 2020)。现在我们能够在同一人脑切片中对分子定义的细胞类型及其细胞构造进行成像,从而详细刻画中不雅观尺度的构造繁芜性及其在跨尺度连接中的浸染(Axer & Amunts, 2022; Kooijmans et al., 2020)。这种方法将更好地理解不同细胞类型在局部及环球层面上的连接办法。
最近,研究重点逐渐转向神经群体的几何形态和动力学(Ebitz & Hayden, 2021; Saxena & Cunningham, 2019)。推动这一研究方向的是这样一个假设:(最故意义的)神经活动发生在捕捉神经变异性的显著部分的低维状态空间或流形中,这些状态空间或流形可以通过在高维神经记录上利用降维技能来识别。研究这些低维状态空间的几何形态和动力学,提出了关于大脑如何掌握运动 (Churchland et al., 2012) 以及如何支持感知和认知任务的新的机制假设 (Chung & Abbott, 2021)。
为了连接不同的尺度并理解从一个尺度到另一个尺度的过渡规则,须要详细的模型来连接这些空间和韶光尺度。此外,还需建立建立生物物理模型来描述生理过程如何被丈量设备捕捉的。例如,此类模型可以通过结合利用侵入性电生理学与高分辨率层流功能磁共振成像,探测大脑皮层深处神经元群体的多单元活动和局部场电位Havlicek et al., 2015) :这包括描述愉快性和抑制性神经元亚群的层特异性分布的微电路模型,然后为 fMRI 旗子暗记模型供应输入,并天生包含神经血管耦合、血液动力学相应和 BOLD 旗子暗记物理模型的 fMRI 旗子暗记天生模型。
随着生理征象打算观点化的兴起和人工神经网络的成功,人们对大脑组织繁芜性的认识不断加深。Marr (1982) 指出,除了神经实现层面之外,还有两个组织层面:算法层面和打算层面。进入21世纪,随着打算能力的增强,打算神经科学的需求也日益增长,它已成为实验和临床研究中不可或缺的一部分。现在,我们不仅可以仿照详细的神经由程,还能构建更宏不雅观、更整合的模型。这些模型将不可避免地揭示大脑的认知架构,并促进更通用人工智能的发展。
大脑理论将打算模型融入观点框架中,并根据信息理论框架(自由能事理,Friston et al., 2006; Parr et al., 2022)或动力系统理论(流形上的构造流,Jirsa & Sheheitli, 2022) 提出它们的功能原则。除了仿照生物信息处理外,打算方法还能高效剖析大型繁芜数据集,通过人工神经网络、理论建模和仿照等手段,将大脑的构造与功能联系起来。在细胞-分子级别和/或系统模型中的仿照有助于测试特定假设或预测大脑构造、动力学乃至行为的特性,同时也能整合各种技能获取的不同研究结果。将所有实验创造(包括模型、文本、图像和其他数据)整合到一个统一的知识框架中仍旧是必要的。这反过来这对付将神经科学的创造转化为数字医学、提出新的治疗策略以及发展神经启示技能至关主要,后者利用了对感知、可塑性、学习和影象的不断增长的见地。
目前最前辈的技能被用于研究全体时空谱的过程,常日是针对特定种、属、科、目、纲或门而定制的。在系统发育树的不同分支(例如无脊椎动物)上开拓的方法仅缓慢地适应其他层级的利用,例如在啮齿类动物和灵长类动物中的运用。近期,研究职员为果蝇创建了一个包含所有细胞和细胞类型的详尽图谱 (Li et al., 2020),并研究了导致宏不雅观功能变革的电路遗传规范 (Handler et al., 2019)。这些信息对理解宏不雅观层面状态转换与个体在连接强度上的差异之间的关系可能至关主要(Taylor et al., 2022)。通过统计整合系统发育知识,将这些知识从模型动物转译至人类,研究职员可以无创地在人脑中横跨尺度构建联系 (Felsenstein, 1985; 早期提到了这种方法的必要性)。
其他无脊椎动物研究的成功例子包括了一系列风雅的可逆扰动工具,这些工具用于解析微不雅观和宏不雅观电路功能,如光遗传学、化学遗传学和路径选择性扰动。这些工具最初在藻类中开拓,并在无脊椎动物中得到了进一步的完善。随后,这些工具极大地改造了啮齿类动物的研究领域(Kim et al., 2017),但直到近期才开始运用于灵长类动物的研究(Gerits et al., 2012;Han et al., 2009;Klink et al., 2021)。比如,研究职员选择利用斑马鱼来理解那些在哺乳动物中难以测试的遗传或发育机制(Rastegar & Strähle, 2016)。靶向扰动也可以通过 CRISPR/Cas9 引入到勾引多能干细胞模型的神经元或脑类器官中。
目前,在比较两种或更多代表性物种的特色时,神经科学会参考系统发育(进化历史)。通过在两个远缘干系的物种中识别进化上的趋同特色,可以用来三角丈量干系特色之间的关联证据(例如,某一脑构造及其干系的行为功能)。识别在近缘物种之间差异明显的进化发散特色,有助于确定物种特异性特化的起源(例如,人类而非其他灵长类动物所独占的脑部特色)。在过去几十年中,为多种物种体例的基因组序列为系统发育信息的爆炸式增长供应了根本,随之出身了用于跨物种比较特色的全新统计工具集,称为系统发育比较方法。
系统发育比较方法伴随数字数据集的可用性及比较神经影像学的发展而兴起(Friedrich et al., 2021)。这些方法将为打算剖析不断增长的比较神经科学数据供应新机会。它们可以进行同源性推断的统计测试;可以仿照一个特色在进化中的守旧程度;并许可在更广泛的分类群中定量考验特色的趋同。随着更多繁芜的大脑数据以数字形式变得可用,并涵盖更多物种,我们将有可能对大脑构造、神经回路和细胞生物学的进化进行建模,同时整合基因组、表不雅观遗传和转录组机制。
例如,研究职员已在125种哺乳动物中研究了却构性大脑连接组与系统发育间隔的比较(Faskowitz et al., 2022)。此外,通过古代 DNA 研究的新创造正逐渐显现,这些研究已被用来将人类特有的基因表达特色与神经解剖学关联起来,特殊是研究尼安德特人对人类 DNA 的贡献(Gunz et al., 2019)。一些当前与人类神经精神疾病干系联的等位基因可能曾与这些适应干系,这些适应是智人——及我们最近与之混居的群体——适应天下各地环境变革时形成的(Benton et al., 2021)。随着关于神经解剖、基因组、生理和行为的数据及比较化石记录的持续积累,新的研究机会将持续涌现。比较数据和进化模型可以被用来通过“逆向工程”方法开拓人类及其他物种的思维,记录它们自然历史中的变革(Sendhoff et al.,2009)。
除此之外,神经科学家还研究各种模型物种的系统层面,以节制大脑构造和功能的详细事理,这不仅限于传统的灵长类和啮齿类模型。虽然小鼠模型在理解人类疾病的神经生物学中发挥了主要浸染,但对付许多人类疾病来说,它们并不理想(Brenowitz & Zakon, 2015)。例如,小鼠常被用来研究朽迈,但它们短缺许多与人类朽迈和干系疾病相似的生物特色。某些模型生物的朽迈过程则与人类相似,尤其是猫和狗,它们展现了许多与人类朽迈相似的特色,并且随着年事增长表现出大脑萎缩和认知衰退(Gunn-Moore et al., 2007;Landsberg et al., 2012;Youssef et al., 2016)。一些猫和狗大脑中的精力病理学与人类阿尔茨海默病中不雅观察到的相似(Head et al., 2000, 2005)。扩展利用各种模型系统来研究人类康健和疾病,有助于我们应对人类医学中的繁芜问题。
鸟类模型,只管其大脑构造与哺乳动物大不相同,已成为研究繁芜认知根本的热门选择。这包括影象空间路线或数百个食品藏匿点、办理问题、社会利他主义、生理理论和多任务处理等功能(Balakhonov & Rose, 2017;Emery, 2006;Güntürkün & Bugnyar, 2016)。鸟类具有卓越的认知能力,夜莺更拥有一个与人类措辞系统相似的歌唱系统。这意味着鸟类是目前唯一一个用于研究大脑中语音信息开拓和处理的动物模型,极大地推动了比较神经解剖学和脑皮层蜕变的研究(Brainard & Doupe, 2002;Brenowitz et al., 1997;Jarvis, 2004, 2019;Nottebohm, 2005)。
此外,经由超过 3.65 亿年的独立进化,鸟类蜕变出了与哺乳动物不同的脑皮层构造,但在干系大脑区域展示出相似的连通性、神经化学特色、神经元数量以及与认知功能干系的细胞的基因表达谱(Colquitt et al., 2021;Herold et al., 2011, 2014;Kverková et al., 2022;Shanahan et al., 2013;Ströckens et al., 2022)。这些比较研究为理解大脑构造和功能之间的基本联系供应了深刻的洞见,并可能识别出鸟类和哺乳动物大脑中高等认知不可或缺的共同神经机制(Stacho et al., 2020)。大规模的比较研究是理解认知的关键,并为解读正常和病理人类大脑功能的神经机制供应了独特的工具。
至于人类/灵长类动物是否进化出独特的构造特性,这仍是一个悬而未决的问题。例如,锥体细胞、中间神经元和胶质细胞的数量和繁芜性,以及特定的大脑网络特性,可能在人类和非人类哺乳动物之间存在差异(Benavides-Piccione et al., 2020;Berg et al., 2021;Fang et al., 2022)。这些研究仅涵盖了少数哺乳动物种类,目前还无法预见这些差异是否会在增加更多物种和参数的考虑下持续存在。此外,只管之前认为新小脑的扩展是人类独占的(Balsters et al., 2010,但现在看来它很可能在所有灵长类动物中以可预测的办法发生(Magielse et al., 2023)。目前已开拓出的方法让我们能够以靠近利用动物模型的详细程度来检讨人类大脑的组织和功能(Eyal et al., 2018;Montero-Crespo et al., 2020)。
虽然这篇概览远非全面,但它揭示了几个主要的点:(1)神经科学的进步不仅源于观点上的提升,也与新方法和技能的涌现紧密干系;(2)新技能不仅加深了我们对大脑的理解,同时也为我们打开了繁芜性的新层次,引发了新的问题;(3)不断增加的跨领域、跨尺度、跨物种和跨模型的知识整合与协作需求正在日益增长。
工具
多种新工具正在深刻推动我们对大脑构造和功能的理解;同时,研究职员还拥有新的能力和强大的算力来剖析数据和仿照大脑功能。这些工具来自环球不同的平台和同盟。
本文将重点先容 EBRAINS,这是一个专为神经科学研究设计的分布式数字研究根本举动步伐。EBRAINS[4 为用户供应了一个统一、数字化、开放、可互操作的平台,通过这个平台,可以访问以前散布在各个实验室的数据、工具、方法和理论。它是在 HBP 项眼前开拓的,并且遵照 FAIR 数据原则(Wilkinson et al., 2016)。
EBRAINS 供应了一系列做事,包括共享神经科学数据和模型、人类的多级大脑图谱、啮齿动物及非人类灵长类动物的大脑图谱、仿照研究、脑启示技能、医学数据剖析以及专门的协尴尬刁难象。此外,它还整合了创新的神经形态打算,并支持在虚拟机器人中进行实验。由欧洲顶尖的高性能打算中央的专家折衷的 Fenix[5]根本举动步伐,极大地促进了对高打算和存储需求的研究。通过 Fenix,神经科学家还可以与其他研究领域的社区互助,共同开拓新的软件和解决方案,以应对数据和打算密集型研究的寻衅。这一互助非常主要,由于它使得不同领域的社区在面对类似问题(例如,大数据集的可视化、数据的快速交互式访问)时能够实现资源的更有效利用。
EBRAINS研究根本举动步伐吸引了广泛且多样化的用户群体,从履历丰富的运用/做事开拓者到资深神经科学家、年轻研究职员及学生均有涉及。利益干系者和用户之间的协作事情和共同创造将成为 EBRAINS 社区的主要组成部分,并辅导其发展。该平台特殊看重工具的易用性,并奥妙地平衡了界面的繁芜性和用户需求。这样的设计便于互助事情,通过结合不同工具构建打算事情流,办理各种问题(例如 Eriksson et al., 2022; Fothergill et al., 2019; Wagner et al., 2022)。在这一点上,EBRAINS 正在改变科学家们研究大脑的办法,无论是在大规模的神经科学研究还是个体项目中都是如此。
打算事情流的特点应包括易于访问、可共享性、自动化、可复现性、互操作性、可移植性和开放性。在此根本上,特殊主要的是采取知识图谱。[6]知识图谱这一工具包含了多模态信息的表示,以及EBRAINS事情流的以下“独立性”特点:
工具和做事独立于利用它们的事情流。这些工具和做事的输入被参数化,以便它们可以根据在不同事情流程中(重新)利用它们的其他工具和做事产生不同的输出。
事情流独立于实行它们的底层根本举动步伐:公共事情流措辞(CWL)[7]被用来以一种通用和标准的办法描述事情流,确保在具有不同哀求、依赖和配置的根本举动步伐中可以透明地实行。
事情流独立于底层的事情流管理系统。有几种系统与CWL兼容,可以实行事情流步骤,监控实行过程,处理故障,自动获取日志和输出以及实行其他干系操作。
这些都为国际互助神经科学研究供应了技能根本,代表了一个大规模互助项目的接口,如国际大脑操持 (IBI)[8]和NIH大脑操持 (Litvina et al., 2019)。同样地,欧洲EBRA同盟制订了欧洲研究共享议程,旨在增强大脑研究的影响力,推进根本、转化和临床大脑研究,改进患有大脑疾病人群的生活,促进大脑创新,并应对欧洲及环球面临的社会和经济寻衅。[9]还有一些人利用了知识表征(KR)这一术语,强调对神经科学大量知识进行精确、稳定和可验证的表征的必要性(Di Maio, 2021)。
再举一个例子:鉴于数字大脑研究的主要性及其对认知、行为和生理康健潜在的益处和代价驱动的影响,马来西亚建立了马来西亚开放科学平台(MSOP)[10],该平台旨在加强国内外的科学、技能和创新。超越大脑本身,在更广泛的范围内,人类参考图谱(Borner et al., 2021)和欧盟委员会的虚拟人类孪生(VHT)操持(由EDITH 折衷与支持行动推动)致力于开拓必要的根本举动步伐,推动全体人体多尺度多器官孪生的创建。这些孪生可能从 EBRAINS 的履历和开拓的工具中受益。
我们还短缺什么?
对大脑功能及其失落调的深入理解现在不仅成为可能,而且迫不及待。神经系统疾病和精神病对患者、照顾护士者、家属以及全体社会都构成了重大包袱。推动这些领域的进展,也受到了探索自我实质、意识和认知等哲学问题的驱动。要更好地理解大脑康健的根本及死活边界,必须搜集不同的视角。同时,伦理、哲学、法律与监管、文化及政治的寻衅密切干系,须要同时被办理。
大脑医学的进步与根本研究的打破密不可分,然而许多基本问题仍待办理。譬如,影象的形成、意识知觉的根本、突触旗子暗记转导的电学与分子生化机制的相互浸染、神经胶质细胞在旗子暗记转导和代谢中的角色、不同大脑状态在突触构造终生重组中的浸染、动力学与认知模型之间的关系、细胞凑集是如何产生详细的认知功能等,这些都是需进一步阐明的主要方面。此外,大脑构造的特定动力学变革,如细胞构造、髓鞘、化学布局和区域间连通性,尚未被充分理解,但这些成分终极影响着不同大脑区域之间愉快性与抑制性细胞活动的比例,,从而在不同区域之间形成动态平衡(Barbero-Castillo et al., 2021; Deco et al., 2018; Demirtaş et al., 2019; Jancke et al., 2022; Kringelbach et al., 2020)。
目前对支持认知功能(如影象或决策)的机制的理解,受到现有技能的规模和精度的限定——微不雅观尺度的同步记录仅限于少数大脑区域,而全脑成像则缺少必要的空间和/或韶光分辨率。打算模型可以帮助补充这一空缺,但目前也处于瓶颈期:险些所有的认知功能机制模型都专注于微不雅观尺度(Amit & Brunel, 1997; Mante et al., 2013; Wang, 2002),而全脑模型紧张用于仿照大规模的神经动力学(Breakspear, 2017; Deco et al., 2011)。为了弥合这一领域的不合,必须开拓新的模型方法,这些方法可能包括在大规模大脑模型中引入简化的认知功能(Mejías & Wang, 2022),扩展诸如循环神经网络这类认知模型至多区域框架(Yang & Molano-Mazón, 2021),或提高现有认知多区域模型的生物合理性(Dora et al., 2021)。
由于临床需求而驱动的与大脑的互动需求(包括读取和刺激/操控),已开辟了如评估意识障碍(如无反应觉醒综合症、锁定综合症等)、脑机接口、认知增强、感官规复和感官扩展技能等新兴且不断扩展的领域,这些技能的干系性已远超医疗领域,影响到社会大众。同时,也须要能够进行高韶光和空间分辨率的大脑记录和活动掌握,且这些技能应尽可能具备非侵入性。这些技能进展须要神经科学与微电子、纳米电子学、光学、光控药物、纳米机器人、新材料(例如石墨烯)等领域的跨学科互助。估量不久将在安全性、生物相容性、大脑反应性变革(如胶质增生、细胞去世亡)、信噪比、侵入性问题(如手术、传染)以及大脑功能的闭环掌握等方面取得进展,这些进展将带来法律和伦理方面的影响。
只管这些领域的进展令人印象深刻,但要全面理解基本过程,须要将每个别系(如视觉、觉得运动)与大脑的其他部分、身体和环境进行整合。此外,还需将分子、亚细胞、细胞和系统层面整合,实现包含所有这些繁芜关系的突现属性的“多尺度”理解。仅考虑系统的一部分无法充分理解这些层面。每个层面的功能失落常可能引发各种神经和精神疾病。为了全面理解这一过程,我们须要理解所有单个步骤,这在本日的很多情形下是困难或不可能的。因此,必须在适当的抽象级别上处理各个步骤,发展干系理论,并通过多层次的构造和功能图谱访问不同大脑组织层面的数据。
最新的自下而上的打算模型可以整合如特定离子通道、突触受体和神经调节剂等微不雅观特色,并评估它们在细胞亚群体水平上的影响。最近,这种方法乃至扩展到全脑层面,通过研究镇痛剂的分子靶点,如异丙酚,及其在大规模活动水平上的浸染。例如,改变K+电导(Dalla Porta 等,2023 年)或抑制性(GABA-A)突触受体的动力学,可以勾引大脑活动转变为同步慢波,达到类似于镇痛剂的效果。[11]这是打算模型可以发挥浸染的领域之一。
为了全面理解行为和认知是如何通过皮层打算产生的,须要结合自下而上和自上而下的方法。范例的例子是腹侧视觉流。只管用于物体识别的深度神经网络受到视觉系统架构的启示,这些网络同样也优化了视觉系统本身的功能模型。实际上,深层网络中模型神经元的统计属性与大脑中记录的真实神经元非常相似(Yamins & DiCarlo, 2016;Zhuang et al.,2021)。用更风雅的自下而上模型再现这种自上而下模型的功能仍是一大寻衅。
实验丈量与模型预测之间的相互浸染非常强大,它们已经在理解网络级征象(如振荡、颠簸(Breakspear, 2017; Marder et al., 2022; Tort-Colet et al., 2021))方面取得了显著进展。将这种方法扩展到全体大脑层面更具寻衅性,由于其涉及的繁芜性较高,而且现有的非侵入性人类成像和记录技能的时空分辨率仍不敷。将这些模型与成像技能结合,须要深入理解各种旗子暗记的生物物理特性。当利用打算模型来定量预测认知功能和朽迈时,这一点尤为主要(Charvet, 2021; Charvet et al., 2022; Heckner et al., 2023; Jonsson et al., 2019),比如,基于患者和康健受试者的成像数据,并在打算模型与临床数据之间建立精确的反馈循环,这终极应有助于更好地理解神经疾病。
网络和其他模型还用于研究生理机制在病理条件下如何发生变异,例如,蛋白质水平的微不雅观变革可能导致非常的行为或临床症状(Mäki-Marttunen et al., 2019)。个中最为人所熟知的是癫痫病例,已经确定了几个导致非常高兴奋性的微不雅观靶标。另一个例子是一个包括神经递质受体数据的多成分因果模型,该模型能预测阿尔茨海默病症状的临床严重程度的变革幅度,从而进一步支持个性化大脑模型的代价,以及将多模态数据融入模型的主要性(Khan et al., 2022)。与此比较,许多其他病理状态如精神分裂症的组织病理学和大脑旗子暗记还不甚明了,打算模型在识别机制及预测可能具有信息量的宏不雅观和/或行为特色方面可能起到关键浸染。为理解答这些和其他研究问题,必须应对许多技能、方法和打算上的寻衅(见Box1)。
Box 1:技能、方法和打算寻衅大脑研究在大脑接口、剖析、机制理解、数听说明及大脑处理建模方面,面临巨大的技能和打算寻衅。以下是一些例子:
(1)数据的繁芜性(包括多级大脑组织、层级构造、并行信息处理、冗余、电化学处理等)。个中一个关键问题是不同尺度间的关系,这关系到找到最适宜阐明这些关系的粒度(及相应的数据)。在物理学中有一个“重整化”的观点,即在不同尺度间保持定律的同等性(例如稀疏耦合、层级动力学、打算事理等)。此外,必须在所有干系尺度上进行丈量,以得到如何从低级状态合成高等状态的信息,并应对神经退化问题,即不同系统配置可能支持相同或相似功能的方向。
(2)不同硬件、软件和剖析方法带来的数据格式和数据模型的多样性。不同研究者和实验室供应的数据常常存在差异,这给数据整合和互操作性带来了障碍。促进标准和折衷程序的采取,包括采取标准化大脑图谱进行空间参照,是极为主要的。这些方法对付促进数据的重用及其在不同情境下的组合和运用起到了关键浸染。
(3)来自人类受试者的大脑数据可以进行去标识处理,但可能无法完备匿名化(即无法追溯到个体)。因此,有必要供应安全的数据存储做事,这些做事须要供应受控或限定的访问权限,以便于数据的再利用。在这些受保护的存储系统中,数据的创造性涉及到公开共享匿名元数据,这是目前 EBRAINS 正在采取的做法。
(4)很多行为和某些机制是人类特有的,但大量数据不可直接获取且仍旧未知(例如,无法在活人的大脑中丈量到细胞层面的化学反应动力学)。研究动物大脑的比较方法以及仿照和建模是办理这一问题的策略。
(5)跨个体的变异性和多样性。将来自不同人群的信息整合到个性化医学的图谱、数据库和研究中是必要的。
(6)鉴于大脑的空间和韶光活动具有多尺度性子,数据集的特定空间和韶光分辨率极为关键。从微不雅观和纳米尺度到中不雅观和宏不雅观尺度的尺度整合是一大寻衅,捕捉大脑动力学同样充满寻衅。这须要根据创造的拓扑特色,在一个共同的框架中表示不同的尺度,即在多级和多尺度的图谱和模型中加入韶光维度。
(7)“子系统”的大尺寸问题(如神经递质受体这类大分子含有许多原子,具有繁芜的动力学构造,大型网络,全体大脑的视角与特定兴趣区域比较,大型人群等)。
(8)系统在病理状态下的反应模式、动力学、可塑性和行为表现出广泛的多样性。
(9)系统性子的变革,表现为不同空间尺度的可塑性(从树突棘到大型网络;尖峰适应、长期增强、长期抑制等过程)或病变后的神经退化。
(10)预测和剖析的准确性和可靠性,尤其是在将其运用于大脑医学方面,对付个别受试者而言至关主要。
(11)缺少一个全面的大脑理论,或选择几种相互竞争的理论。
(12)缺少将广泛的大脑样本通过当代实验方法(包括欧洲和天下各地已有 100 多年历史的实验方法)进行整合和记录的能力,更好地利用历史大脑样本和数据显得尤为主要。这些样本数量可能达到数十万乃至数百万,大多数还未进行数字化或通过网络工具供应。个中一些包括罕有物种或在无法再现的条件下得到的大脑(例如,未治疗的脑病患者)。让这些资料在环球范围内数字化,供研究职员利用,将极大地促进进化、比较以及临床研究;然而,这一目标涉及到数据交流、存储和安全方面的重大寻衅。目前已经开始考试测验将尸检大脑解剖与数字框架中的体内成像结合,例如https://bradipho.eu/。
伦理和社会问题作为负任务数字大脑研究的动力数字大脑研究应由科学好奇心和推动社会利益的欲望所驱动;同时,它应反响社会的优先关怀,这包括更深入地理解大脑功能、开拓更精良的诊断工具,以及治疗大脑疾病的更有效方法。本节中,我们将简要提出如何确保社会关怀得到妥善处理并表示在研究及其成果中,并磋商如何确保研究和创新过程的负任务实行。未来的研究项目必须融入前瞻性实践、神经伦理反思、多方利益干系者及公民的参与,并持续遵守现行的法律、规章和良好研究老例。这包括仔细考虑数据天生和研究管理中性别与多样性的浸染,关注可能的双用场研究或误用神经科学创造的风险,以及对研究的伦理可持续性、人权影响及其长远的社会政治影响进行寻思。
数字大脑研究须要考虑的其他社会法律问题还包括数据保护问题、欧洲委员会的通用数据保护条例(GDPR)下的数据管理、社会期待、接管度以及数字大脑模型的可持续性问题,还有前辈人工智能、脑启示型打算和神经机器人研究可能带来的问题等。例如,神经科学与技能的领悟很可能引领AI的新方向。在数字大脑研究中,应重视不仅仅是数据的大量积累,更要确保数据的多样性代表性,包括性别、年事和种族等成分。这种原谅性扩展到所有参与者,包括研究职员、实践者亲睦处干系者。通过倡导多样性,该领域能够有效地办理AI中的偏见问题,并主动应对峙异方法、技能和运用带来的新问题。
负任务的研究与创新(RRI)框架提出了一种多学科策略,用于办理未来数字大脑研究愿景所伴随的伦理、哲学、社会和监管寻衅。此外,RRI引发的研究和实践有助于培植一个积极主动识别现存和新兴社会及伦理寻衅的负任务数字大脑研究未来。
数字大脑模型是未来大脑研究的核心观点和模式。它们提出了一些主要的哲学问题(例如,脑机接口访问其他大脑的权限该当有什么限定?)(Evers & Sigman, 2013) 和伦理社会问题(例如,这项技能是否有潜在的运用问题?谁卖力潜在运用的剖析和决策?我们希望如何在社会中利用这些模型?)(Evers & Salles, 2021)。清晰的观点定义是就数字大脑研究引发的伦理问题进行知情谈论的条件。通过 RRI 框架核阅这些问题,包括对涉及观点的意义和适当性进行反思,以及神经科学研究不同学科之间的互换和对话,包括哲学家、伦理学家、社会科学家与政策制订者、利益组织和"大众年夜众等社会利益干系者的互动(Box 2)。
Box 2:伦理问题数字大脑研究所引发的伦理问题需被认识到,特殊是与数字孪生技能干系的问题。
(1)隐私。数字孪生系统会持续地用现实天下的数据进行更新。当成像、遗传及临床数据结合利用时,这些数据每每随意马虎被识别。即便是数量弘大的“伶仃”信息源也可能被识别,特殊是在涉及罕见病例时。随着大数据时期的来临,有效的去识别化变得越来越困难(Choudhury et al.,2014)。在赞许过程中,奉告个体关于隐私的考虑极为主要,他们须要明白随韶光推移,识别风险可能会增加(White et al.,2022)。作为一个社区,我们须要与政府机构互助,未来制订干系政策。
(2)“读心术”。数字大脑研究每每涉及情绪、感知、影象及生理状态等领域,这些领域常日被视为内心生活的神圣部分,因此对隐私的担忧更为严重。已有研究表明,通过大脑成像及其二心理丈量,可以在人群中预测行为(Bell et al.,2019;Talozzi et al.,2023)。数字大脑模型的潜力更大,不仅可以对特定的大脑状态进行分类,还能提出增强这些状态的方法(Ligthart et al.,2021)。
(3)恶意行为。数字大脑研究的“双重用场”性子逐渐被人们认识到,它可能带来的危害与益处同样重大。
未完待续……
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