Ioannis Pisokas, Stanley Heinze, Barbara Webb. The heading direction circuit of two insect species.  bioRxiv 854521; doi: https://doi.org/10.1101/854521

Abstract
Recent studies of the Central Complex in the brain of the fruit fly Drosophila melanogaster have identified neurons with localised activity that tracks the animal’s heading direction. These neurons are part of a neuronal circuit with dynamics resembling those of a ring attractor. Other insects have a homologous circuit sharing a generally similar topographic structure but with significant structural and connectivity differences. In this study, we model the precise connectivity patterns in two insect species to investigate the effect of the differences on the dynamics of the circuit. We illustrate that the circuit found in locusts can also operate as a ring attractor and we explore the role and robustness of the connectivity parameters. We identify differences that enable the fruit fly circuit to respond faster to changes of heading while they render the locust circuit more tolerant to noise. Our findings demonstrate that subtle differences in neuronal projection patterns can have a significant effect on the circuit performance and emphasise the need for a comparative approach in neuroscience.

Ioannis Pisokas, Stanley Heinze, Barbara Webb. The heading direction circuit of two insect species.  bioRxiv 854521; doi: https://doi.org/10.1101/854521