Neural Coding: Bumps on the Move Stanley Heinze  Current Biology  Volume 27, Issue 11, Pages R409-R412 (June 2017) DOI: 10.1016/j.cub.2017.03.072 Copyright © 2017 Elsevier Ltd Terms and Conditions

Figure 1 Angular velocity sensing drives update of head-direction signal. (A) Schematic depictions of an insect brain and central complex. Wedge-neuron activity correlating with head direction of the fly is illustrated in orange. Two out of 16 existing wedge-neurons are shown; arrows indicate neuron polarity. (B) Change in activity during turning movements of the fly. Right turn: red; left turn: blue. Tile neurons on either side of the protocerebral bridge (PB) signal heading in conjunction with rotational velocity elicited by body rotations in one direction. The columnar offset in projections to the ellipsoid body (EB) between wedge- and tile-neurons causes the more active tile-neuron to excite the wedge-neuron encoding the heading angle targeted by the fly’s rotation. Dashed lines: putative input neurons signaling rotational velocity to the tile-neurons. (C) Resulting activation pattern of wedge-neurons after completion of the turn. Current Biology 2017 27, R409-R412DOI: (10.1016/j.cub.2017.03.072) Copyright © 2017 Elsevier Ltd Terms and Conditions