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Efficient encoding of motion is mediated by gap junctions in the fly visual system
Fig 3
Near-optimal motion representation with GJs.
(A) Near optimal motion representation for natural stimuli due to GJs by both triplets of VS cells (blue cross) and by the whole VS network (blue dot). The efficiency of the representation for a subpopulation is denoted by a single point in the IDe−Ax − Iθ−Ax plane, which shows how much information (in bits) corresponds to the neural cost and how much information is provided at this cost to represent the axis of rotation. This plane shows the feasible (blue region) and infeasible (white region) separated by the bound 
, dark blue line (see Materials and Methods) for all axes of rotation of natural stimuli. The error bars depicting encoding efficiencies for triplets with/without GJs (blue vs. orange, respectively). Single cells with/without GJs appear in green/yellow squares, respectively (all 20 individual VS cells behaved very similarly to each other). The encoding efficiency of the whole VS network with/without GJs is shown in blue/orange circles. (B) The scatterplot of efficiencies for representations of all 120 triplets (all possible triplets out of the 10 VS cells; the same triplets were used in both sides of the visual system), with/without GJs (blue/orange respectively). The arrows point to VS5-6-7, the triplet connecting downstream to the neck motor center. Note the considerable improvement in efficiency due to GJs for this triplet. (C) Similar to (A), but for checkerboard stimuli. (D) Similar to (B), but for checkerboard stimuli.
doi: https://doi.org/10.1371/journal.pcbi.1005846.g003