Dendritic Mechanisms Underlying Behaviorally-Relevant Activity in a Descending Auditory Pathway
下降听觉通路中行为相关活动的树突机制
基本信息
- 批准号:10540726
- 负责人:
- 金额:$ 47.65万
- 依托单位:
- 依托单位国家:美国
- 项目类别:
- 财政年份:2021
- 资助国家:美国
- 起止时间:2021-01-01 至 2025-12-31
- 项目状态:未结题
- 来源:
- 关键词:AcousticsActive ListeningAddressAnatomyAnesthesia proceduresAnimalsApicalAuditoryAuditory areaAuditory systemBehavioralBehavioral AssayBiophysical ProcessBrainBrain StemCognitionCognitiveComplexDataDendritesDetectionDiscriminationEpidemicEventFeedbackFrequenciesGenerationsGlutamatesGoalsHeadHearingHearing problemImageIn VitroInferior ColliculusKnowledgeLearningLightLinguisticsLinkMediatingMidbrain structureMusNeuronsNoise-Induced Hearing LossOutcomeOutputPathway interactionsPerceptionPerceptual learningPlayPresbycusisPublic HealthQuality of lifeRewardsRoleSensoryShapesSignal TransductionSpeechStimulusStreamSynapsesTestingTimeTinnitusWorkauditory discriminationauditory pathwayauditory processingawakeexperienceexperimental studyhearing impairmentimprovedneuronal cell bodynovel strategiesoperationoptogeneticsphysical propertypreventsegregationsensory systemsoundtransmission processtwo-photon
项目摘要
Project Summary/Abstract
Active listening is central to auditory cognition, supporting critical functions such as stream segregation,
linguistic analysis and perceptual learning. To this end, the brain must accurately represent the physical
properties of acoustic signals and subsequently parse sounds based on their behavioral relevance. Whereas
the encoding of primary features such as amplitude and spectral content typically begins in specialized
brainstem and midbrain circuits, the mechanisms by which sounds attain behavioral relevance are poorly
understood. A long-standing assumption is that descending projections from auditory cortex, which contact
most early ascending auditory circuits, play a critical role in ascribing behavioral relevance to sounds. Indeed,
descending auditory cortical projections could provide an anatomical substrate for "top-down" signals to control
the "bottom-up" encoding of acoustic features. Despite this presumed importance, little is known about the
function of descending auditory cortical neurons in attentive listening, nor do we understand the biophysical
mechanisms that dictate their contribution to central auditory processing. Our goal is to address these
knowledge gaps in behaving mice by studying the descending pathway from auditory cortex to inferior
colliculus, an auditory midbrain region critical for perceiving complex sounds. Our unpublished results support
a working hypothesis whereby auditory cortico-collicular neurons encode learned information, thereby
transmitting signals that amplify the representation of behaviorally relevant sound features in early auditory
circuits. Our data further suggest that a key mechanism underlying the activity of auditory cortico-collicular
neurons during active listening is the non-linear generation of dendritic spikes, powerful electrical events that
initiate in the apical dendrites of cortical neurons and drive high-frequency burst firing at the soma. We propose
testing these hypotheses using a unique combination of sub-cellular 2-photon Ca2+ imaging, optogenetics and
behavioral assays in awake, head-fixed mice. The positive outcome will be to establish functional and
mechanistic answers for the operation of a descending auditory cortical pathway during attentive listening,
thereby shedding light on a critical yet poorly understood facet of the central auditory system.
项目总结/文摘
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Pierre F Apostolides其他文献
Pierre F Apostolides的其他文献
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{{ truncateString('Pierre F Apostolides', 18)}}的其他基金
Dendritic Mechanisms Underlying Behaviorally-Relevant Activity in a Descending Auditory Pathway
下降听觉通路中行为相关活动的树突机制
- 批准号:
10840622 - 财政年份:2021
- 资助金额:
$ 47.65万 - 项目类别:
Dendritic Mechanisms Underlying Behaviorally-Relevant Activity in a Descending Auditory Pathway
下降听觉通路中行为相关活动的树突机制
- 批准号:
10322647 - 财政年份:2021
- 资助金额:
$ 47.65万 - 项目类别:
Dendritic Mechanisms Underlying Behaviorally-Relevant Activity in a Descending Auditory Pathway
下降听觉通路中行为相关活动的树突机制
- 批准号:
10093816 - 财政年份:2021
- 资助金额:
$ 47.65万 - 项目类别:
Mechanisms and function of neurotransmitter corelease at an auditory synapse
听觉突触神经递质共释放的机制和功能
- 批准号:
8255257 - 财政年份:2011
- 资助金额:
$ 47.65万 - 项目类别:
Mechanisms and function of neurotransmitter corelease at an auditory synapse
听觉突触神经递质共释放的机制和功能
- 批准号:
8573552 - 财政年份:2011
- 资助金额:
$ 47.65万 - 项目类别:
Mechanisms and function of neurotransmitter corelease at an auditory synapse
听觉突触神经递质共释放的机制和功能
- 批准号:
8581341 - 财政年份:2011
- 资助金额:
$ 47.65万 - 项目类别:
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