Dynamic sensory representations in adult auditory cortex

成人听觉皮层的动态感觉表征

• 批准号: 9404442
• 负责人: JEFFRY S ISAACSON
• 金额: $ 47.38万
• 依托单位: UNIVERSITY OF CALIFORNIA, SAN DIEGO
• 依托单位国家: 美国
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/9404442
• 关键词: Accelerometer; Acoustics; Address; Adult; Affect; Animals; Attention; Auditory; Auditory area; Auditory system; Autistic Disorder; Awareness; Behavior; Behavioral; Brain; Brain Diseases; Brain region; Cells; Chronic; Code; Cognition Disorders; Communication; Development; Electrophysiology (science); Environment; Felis catus; Functional disorder; Head; Hearing; Image; Individual; Interneurons; Knowledge; Lead; Learning; Mammals; Mediating; Methods; Mus; Music; Neurons; Neurosciences; Optics; Perception; Physiological; Play; Population; Post-Traumatic Stress Disorders; Primates; Property; Quality of life; Research; Resolution; Rodent; Role; Schizophrenia; Sensory; Specificity; Stimulus; Techniques; Time; auditory processing; awake; base; calcium indicator; cell type; critical developmental period; experience; experimental study; extracellular; flexibility; habituation; in vivo; information processing; insight; neuronal circuitry; optogenetics; relating to nervous system; response; sensory cortex; sound; two-photon

Project Summary/Abstract The sense of hearing contributes significantly to our quality of life. Indeed, the auditory system plays a fundamental role in our awareness of our local environment, communication, and our ability to enjoy music. However, the mechanisms underlying the processing and encoding of sensory information in the brain are not clear. To address this question, we study the properties of neuronal circuits in the auditory cortex, a higher brain region important for sound perception. The long-term objective of our research is to understand how the interplay of different types of excitatory and inhibitory circuits regulate sensory information processing in the brain. The experiments proposed employ optical recording techniques to study the response properties of large ensembles of neurons in auditory cortex. Specific Aim 1 proposes the development of a strategy for chronic, in vivo two-photon recording of activity from identified cell populations in the primary auditory cortex of awake, head-fixed mice. We will use this approach to determine the tuning properties and spatial organization of principal cells in different cortical layers as well as distinct subtypes of inhibitory interneurons. Specific Aim 2 proposes to investigate how sensory representations in adult auditory cortex are shaped by experience. We hypothesize that brief daily experience to sounds causes a long-lasting habituation of cortical principal cell responses mediated by local inhibitory interneurons. Specific Aim 3 proposes to investigate how cortical activity is modulated by sound-guided behavior. We hypothesize that engagement in an auditory task rapidly enhances cortical representations to sounds compared to passive listening. Moreover, this modulation by sound-guided behavior is also due to changes in the activity of local interneurons. Together, these experiments will show that cortical sensory representations are highly flexible and bidirectionally modulated by local inhibitory circuits that regulate the salience of acoustic stimuli.

项目概要/摘要 听觉对我们的生活质量有重大贡献。事实上，听觉系统起着 在我们对当地环境的认识、沟通和享受音乐的能力中发挥着重要作用。 然而，大脑中感觉信息处理和编码的机制并不明确。 清除。为了解决这个问题，我们研究了听觉皮层（高级大脑）中神经元回路的特性。 对声音感知很重要的区域。我们研究的长期目标是了解相互作用如何 不同类型的兴奋性和抑制性电路调节大脑中的感觉信息处理。 提出的实验采用光学记录技术来研究大的响应特性 听觉皮层中的神经元群。具体目标 1 建议制定一项长期战略， 体内双光子记录清醒初级听觉皮层中已识别细胞群的活动， 头部固定的小鼠。我们将使用这种方法来确定主体的调整属性和空间组织 不同皮质层的细胞以及抑制性中间神经元的不同亚型。具体目标 2 建议 研究成人听觉皮层的感觉表征是如何被经验塑造的。我们假设 每天对声音的短暂体验会导致皮层主细胞反应介导的持久习惯 通过局部抑制性中间神经元。具体目标 3 提议研究皮层活动如何被调节 声音引导的行为。我们假设参与听觉任务会迅速增强皮质 与被动聆听相比，对声音的表征。此外，这种通过声音引导行为的调制 也是由于局部中间神经元活动的变化所致。总之，这些实验将表明皮质 感觉表征高度灵活，并且由调节局部抑制电路双向调节 声音刺激的显着性。