Sensorimotor experience remaps visual input to a heading-direction network.
Sensorimotor experience remaps visual input to a heading-direction network.
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DOI:
10.1038/s41586-019-1772-4
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发表时间:
2019-12
期刊:
影响因子:
64.8
通讯作者:
Wilson RI
中科院分区:
文献类型:
--
作者:
Fisher YE;Lu J;D'Alessandro I;Wilson RI
In the Drosophila brain, “compass neurons” track the orientation of the body and head during navigation (the fly’s heading). In the absence of visual cues, the compass neuron network estimates heading by integrating self-movement signals over time. When a visual cue is present, the network’s estimate is more accurate. Visual inputs to compass neurons are thought to originate from inhibitory neurons called R neurons; R neuron receptive fields tile visual space. The axon of each R neuron overlaps with the dendrites of every compass neuron, raising the question of how visual cues are integrated into the compass. Here, using in vivo whole-cell recordings, we show that a visual cue can evoke synaptic inhibition in compass neurons, and R neurons mediate this inhibition. Each compass neuron is only inhibited by specific visual cue positions, implying that many potential connections from R neurons onto compass neurons are actually weak or silent. Notably, we show that the pattern of visually evoked inhibition can reorganize over minutes as the fly explores an altered virtual reality environment. Using ensemble calcium imaging, we demonstrate that this reorganization causes persistent changes in the compass coordinate frame. Our results suggest a model where correlated pre- and postsynaptic activity triggers associative long-term synaptic depression of visually evoked inhibition in compass neurons. Our findings provide evidence for the theoretical proposal that associative plasticity of sensory inputs, when combined with attractor dynamics, can reconcile self-movement information with changing external cues to generate a coherent sense of direction.
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DOI:
10.1073/pnas.1500804112
发表时间:
2015-05-26
影响因子:
11.1
作者:
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通讯作者:
de Bivort, Benjamin L.
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通讯作者:
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