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Generation of temporal codes by elementary thalamocortical circuits in auditory cortex

Generation of temporal codes by elementary thalamocortical c...

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中国神经科学学会第九届全国学术会议暨第五次会员代表大会

作者： Lukas Mesik Zilkha Neurogenetic Institute Keck School of MedicineUniversity of Southern CaliforniaLos AngelesCA 90089USA

＜正＞Temporal codes in the form of relative spike latency can efficiently encode sensory *** implementation of such coding strategy requires a broad dynamic range of spike latencies in order to achieve sufficient coding capacity and *** generation of spike latency codes in the sensory pathway remains largely *** report that in individual auditory cortical neurons,spike latency codes for sound frequency cannot be simply attributed to thalamocortical relays,but are primarily generated de novo by local circuits,which fine-tune the integration time for spike generation after the arrival of thalamocortial *** tuned recurrent excitation shortens integration time selectively at the optimal frequency,while broadly tuned inhibition prolongs it preferentially at off-optimal *** push-and-pull antagonistic modulations greatly sharpen spike latency tuning and expand its dynamic ***,thalamocortical circuit-like elementary synaptic circuits can convert information spatially coded in distributions of synaptic strength into temporal codes.

关键词： auditory cortex first spike latency frequency tuning latency coding synaptic circuitry in vivo whole-cell recording

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Auditory cortical plasticity:from young to adult

Auditory cortical plasticity:from young to adult

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中国神经科学学会第十届全国学术会议

作者： Kexin Yuan 清华大学医学院生物医学工程系

Synapses and neuronal receptive fields of the cerebral cortex are plastic both in young and mature *** hi life,neural circuits are highly susceptible to outside *** organization of primary auditory cortex（AI） in particular is governed by acoustic experience during the cirtical *** important principle of synaptic organization in mature brains is the balance between excitation and inhibition,but it is unknown how and when this excitatory-inhibitory balance is initially established and *** used whole-cell recordings to determine the processes underlying the development of synaptic receptive fields in rat *** found that sensory evoked inhibitory responses were initially less selective and mismatched with excitatory *** further reported that the pace of cortical synaptic receptive field development is set by progressive,experience-dependent refinement of intracortical *** mature brains,cortical receptive fields can be modified in a manner that depends on the patterns of electrical activity,sensory experience,and engagement of neuromodulatory systems such as the cholinergic nucleus *** relationship between synaptic and receptive field changes and perceptual plasticity,however,is poorly *** used in vivo whole-cell recordings and behavioral testing to explore that relationship in more *** will discuss how synaptic modifications and receptive field changes are reflected in the encoding of frequency and intensity information in rat auditory cortex,and demonstrate that these changes are expressed in the perceptual behavior of animals in sensory detection and classification *** is concluded that direct modification of specific cortical inputs leads to wide-scale synaptic changes,which collectively support improved sensory perception and enhanced behavioral performance.

关键词： auditory cortex development plasticity in vivo whole-cell recording

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