Spike Burst Coding of Translatory Optic Flow and Depth from Motion in the Fly Visual System.

Autor:	Longden KD; Department of Bioengineering, Imperial College London, London SW7 2AZ, UK. Electronic address: longdenk@janelia.hhmi.org., Wicklein M; Department of Bioengineering, Imperial College London, London SW7 2AZ, UK., Hardcastle BJ; Department of Bioengineering, Imperial College London, London SW7 2AZ, UK., Huston SJ; Department of Bioengineering, Imperial College London, London SW7 2AZ, UK., Krapp HG; Department of Bioengineering, Imperial College London, London SW7 2AZ, UK.
Jazyk:	angličtina
Zdroj:	Current biology : CB [Curr Biol] 2017 Nov 06; Vol. 27 (21), pp. 3225-3236.e3. Date of Electronic Publication: 2017 Oct 19.
DOI:	10.1016/j.cub.2017.09.044
Abstrakt:	Many animals use the visual motion generated by traveling straight-the translatory optic flow-to successfully navigate obstacles: near objects appear larger and to move more quickly than distant objects. Flies are expert at navigating cluttered environments, and while their visual processing of rotatory optic flow is understood in exquisite detail, how they process translatory optic flow remains a mystery. We present novel cell types that have local motion receptive fields matched to translation self-motion, the vertical translation (VT) cells. One of these, the VT1 cell, encodes self-motion in the forward-sideslip direction and fires action potentials in spike bursts as well as single spikes. We show that the spike burst coding is size and speed-tuned and is selectively modulated by motion parallax-the relative motion experienced during translation. These properties are spatially organized, so that the cell is most excited by clutter rather than isolated objects. When the fly is presented with a simulation of flying past an elevated object, the spike burst activity is modulated by the height of the object, and the rate of single spikes is unaffected. When the moving object alone is experienced, the cell is weakly driven. Meanwhile, the VT2-3 cells have motion receptive fields matched to the lift axis. In conjunction with previously described horizontal cells, the VT cells have properties well suited to the visual navigation of clutter and to encode the fly's movements along near cardinal axes of thrust, lift, and forward sideslip. (Copyright © 2017 Elsevier Ltd. All rights reserved.)
Databáze:	MEDLINE
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