Central Vestibular Tuning Arises from Patterned Convergence of Otolith Afferents.

Central Vestibular Tuning Arises from Patterned Convergence of Otolith Afferents.
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DOI:
10.1016/j.neuron.2020.08.019
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发表时间:
2020-11-25
期刊:
影响因子:
16.2
通讯作者:
Bagnall MW
Bagnall MW
中科院分区:
医学1区
文献类型:
--
作者:
Liu Z;Kimura Y;Higashijima SI;Hildebrand DGC;Morgan JL;Bagnall MW

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As sensory information moves through the brain, higher-order areas exhibit more complex tuning than lower areas. Though models predict that complexity arises via convergent inputs from neurons with diverse response properties, in most vertebrate systems convergence has only been inferred rather than tested directly. Here we measure sensory computations in zebrafish vestibular neurons across multiple axes in vivo. We establish that whole-cell physiological recordings reveal tuning of individual vestibular afferent inputs and their postsynaptic targets. Strong, sparse synaptic inputs can be distinguished by their amplitudes, permitting analysis of afferent convergence in vivo. An independent approach, serial-section electron microscopy, supports the inferred connectivity. We find that afferents with similar or differing preferred directions converge on central vestibular neurons, conferring more simple or complex tuning, respectively. Together these results provide a direct, quantifiable demonstration of feedforward input convergence in vivo. Though computational models predict how sensory inputs converge in central neurons, it is technically challenging to test these ideas experimentally. With whole-cell recordings in larval zebrafish in vivo, Liu et al. demonstrate that the convergence of similarly or differently tuned vestibular afferents produces more simple or complex postsynaptic tuning, respectively.
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