A functionally ordered visual feature map in the Drosophila brain.

Our Research / Publications

janelia7_blocks-janelia7_biblio_header | block

Neuron. 2022 May 18;110(10):1700. doi: 10.1016/j.neuron.2022.02.013

View Article on

A functionally ordered visual feature map in the Drosophila brain. Rubin LabReiser LabCard Lab

Klapoetke NC, Nern A, Rogers EM, Rubin GM, Reiser MB, Card GM

janelia7_blocks-janelia7_biblio_abstract | block

Abstract

Topographic maps, the systematic spatial ordering of neurons by response tuning, are common across species. In Drosophila, the lobula columnar (LC) neuron types project from the optic lobe to the central brain, where each forms a glomerulus in a distinct position. However, the advantages of this glomerular arrangement are unclear. Here, we examine the functional and spatial relationships of 10 glomeruli using single-neuron calcium imaging. We discover novel detectors for objects smaller than the lens resolution (LC18) and for complex line motion (LC25). We find that glomeruli are spatially clustered by selectivity for looming versus drifting object motion and ordered by size tuning to form a topographic visual feature map. Furthermore, connectome analysis shows that downstream neurons integrate from sparse subsets of possible glomeruli combinations, which are biased for glomeruli encoding similar features. LC neurons are thus an explicit example of distinct feature detectors topographically organized to facilitate downstream circuit integration.