Adaptive Rewiring of a Sensory Network through Spike-Timing-Dependent Plasticity

通过尖峰时间依赖性可塑性自适应重新连接感觉网络

• 批准号: 1755071
• 负责人: Bruce Carlson
• 金额: $ 70万
• 依托单位: Washington University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-05-15 至 2023-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1755071&HistoricalAwards=false
• 关键词: Adaptive; Rewiring; Sensory; Network; through

Behavior in all animals, including humans, depends on detecting external sensory stimuli and responding appropriately. There are a variety of mechanisms by which sensory systems maximize the detection of stimuli that are important to the animal. However, the sensory environment is constantly changing. How can animals reliably detect behaviorally relevant sensory stimuli while also retaining the flexibility to adapt to changes in the sensory environment? One possible mechanism is synaptic plasticity in which the strengths of the synaptic connections between neurons are adjusted based on past experience. The central hypothesis of this project is that the intrinsic dynamics of neural networks induce synaptic plasticity that results in increased sensitivity to frequently encountered stimuli. Synaptic plasticity is found throughout the brain, but it is generally challenging to study directly in a living animal. The researchers capitalize on the unique experimental advantages of electric fish, in which it is possible to manipulate precisely and monitor the electrical activity of sensory neurons in an awake, behaving animal. In the context of social communication behavior, the researchers study how plasticity alters responses to sensory input, whether natural patterns of sensory input can induce this plasticity, and how this plasticity impacts the behavioral detection of stimuli. This research has broad implications by elucidating how sensory systems adjust to changing external conditions. In addition, electric fish are excellent tools for public outreach in neuroscience and behavior. As exotic animals, they attract a wide audience. The project includes ongoing outreach and education activities to teach K-12 students in the St. Louis region about hypothesis-driven science and the importance of brain plasticity in sensory perception and behavior.Temporal codes have been implicated in sensory processing, cognition, and motor control. Recent studies reveal several mechanisms by which central sensory pathways decode temporal patterns. However, the sensory environment can change. A fundamental problem in sensory neuroscience is understanding how central circuits can robustly detect behaviorally relevant stimuli while retaining the flexibility to adapt to changes in the sensory environment. Spike-timing-dependent plasticity (STDP), in which synaptic strength is adjusted as a function of the relative timing of pre- and postsynaptic spiking, is found in several brain regions across a wide diversity of species. However, its role in the processing of behaviorally relevant stimuli remains controversial, largely because it is inherently difficult to link changes in synaptic strength at the cellular level to effects on behavior. The central hypothesis of this project is that STDP provides a mechanism for modifying network connectivity to adapt information processing to a changing sensory environment. The researchers address this hypothesis by using an integrative approach that capitalizes on the unique experimental advantages of electric fish, in which temporal patterns of spiking are themselves the behaviorally relevant stimulus. Using a combination of neurophysiology, imaging, and behavior, the researchers are determining how STDP alters responses to sensory input in awake and behaving animals, how natural patterns of sensory input can elicit STDP, and how these changes impact behavioral stimulus detection. The project includes outreach and education efforts that target K-12 students in the St. Louis region to teach them about brain plasticity and how the scientific method can be used to address questions about how brains control behavior. As part of the outreach, researchers lead hands-on activities that include experiments with freely behaving fish, psychophysical experiments on participants, and multimedia demonstrations to illustrate brain plasticity and its role in modifying behavior.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

包括人类在内的所有动物的行为都依赖于检测外部感官刺激并做出适当的反应。有多种机制，通过这些机制，感觉系统最大限度地检测对动物重要的刺激。然而，感官环境在不断变化。动物如何可靠地检测与行为相关的感官刺激，同时保持适应感官环境变化的灵活性？一种可能的机制是突触可塑性，其中神经元之间突触连接的强度基于过去的经验进行调整。该项目的中心假设是神经网络的内在动力学诱导突触可塑性，导致对频繁遇到的刺激的敏感性增加。突触可塑性在整个大脑中都有发现，但直接在活体动物中进行研究通常具有挑战性。研究人员利用了电鱼独特的实验优势，可以精确地操纵和监测清醒的行为动物感觉神经元的电活动。在社会沟通行为的背景下，研究人员研究了可塑性如何改变对感官输入的反应，感官输入的自然模式是否可以诱导这种可塑性，以及这种可塑性如何影响刺激的行为检测。这项研究通过阐明感觉系统如何适应不断变化的外部条件而具有广泛的意义。此外，电鱼是神经科学和行为学公共宣传的绝佳工具。作为外来动物，它们吸引了广泛的观众。该项目包括正在进行的外展和教育活动，教导圣路易斯地区的K-12学生关于假设驱动的科学以及大脑可塑性在感官知觉和行为中的重要性。时间代码与感官处理，认知和运动控制有关。最近的研究揭示了中枢感觉通路解码时间模式的几种机制。然而，感官环境可以改变。感觉神经科学中的一个基本问题是理解中央回路如何能够稳健地检测行为相关刺激，同时保持适应感觉环境变化的灵活性。尖峰定时依赖可塑性（STDP），其中突触强度作为突触前和突触后尖峰的相对定时的函数进行调整，在多种物种的几个脑区中被发现。然而，它在处理行为相关刺激中的作用仍然存在争议，主要是因为它本质上很难将细胞水平上突触强度的变化与行为的影响联系起来。该项目的中心假设是，STDP提供了一种机制，用于修改网络连接，以适应信息处理不断变化的感官环境。研究人员通过使用一种综合方法来解决这一假设，该方法利用了电鱼独特的实验优势，其中尖峰的时间模式本身就是行为相关的刺激。使用神经生理学，成像和行为的组合，研究人员正在确定STDP如何改变清醒和行为动物对感觉输入的反应，感觉输入的自然模式如何引起STDP，以及这些变化如何影响行为刺激检测。该项目包括针对圣路易斯地区K-12学生的外展和教育工作，向他们传授大脑可塑性以及如何使用科学方法来解决有关大脑如何控制行为的问题。作为推广活动的一部分，研究人员领导的实践活动，包括自由行为的鱼类实验，参与者的心理物理实验，以及多媒体演示，以说明大脑可塑性及其在改变行为中的作用。该奖项反映了NSF的法定使命，并已被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。

项目成果

Pauses during communication release behavioral habituation through recovery from synaptic depression

• DOI: 10.1016/j.cub.2021.04.056
• 发表时间: 2021-07-26
• 期刊: CURRENT BIOLOGY
• 影响因子: 9.2
• 作者: Kohashi, Tsunehiko;Lube, Adalee J.;Carlson, Bruce A.
• 通讯作者: Carlson, Bruce A.

Signal Diversification Is Associated with Corollary Discharge Evolution in Weakly Electric Fish

信号多样化与弱电鱼的必然放电演化有关

• DOI: 10.1523/jneurosci.0875-20.2020
• 发表时间: 2020
• 期刊: The Journal of Neuroscience
• 作者: Fukutomi, Matasaburo;Carlson, Bruce A.
• 通讯作者: Carlson, Bruce A.

Integrating neuroplasticity and evolution

• DOI: 10.1016/j.cub.2023.03.002
• 发表时间: 2023-04
• 期刊: Current Biology
• 影响因子: 9.2
• 作者: C. Axelrod;S. Gordon;B. Carlson

Spike timing-dependent plasticity alters electrosensory neuron synaptic strength in vitro but does not consistently predict changes in sensory tuning in vivo

• DOI: 10.1152/jn.00498.2022
• 发表时间: 2023-05-01
• 期刊: JOURNAL OF NEUROPHYSIOLOGY
• 影响因子: 2.5
• 作者: Lube，Adalee J.;Ma，Xiaofeng;Carlson，Bruce A.
• 通讯作者: Carlson，Bruce A.