A visual pathway for skylight polarization processing in Drosophila

eLife, Год журнала: 2021, Номер 10

Опубликована: Март 23, 2021

Many insects use patterns of polarized light in the sky to orient and navigate. Here, we functionally characterize neural circuitry fruit fly, Drosophila melanogaster , that conveys signals from eye central complex, a brain region essential for fly’s sense direction. Neurons tuned angle polarization ultraviolet are found throughout anterior visual pathway, connecting optic lobes with complex via tubercle bulb, homologous organization ‘sky compass’ pathways described other insects. We detail how consistent, map-like tunings peripheral system is transformed into reduced representation suited flexible processing brain. This study identifies computational motifs transformation, enabling mechanistic comparisons multisensory integration navigation brains

Язык: Английский

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A decentralised neural model explaining optimal integration of navigational strategies in insects

eLife, Год журнала: 2020, Номер 9

Опубликована: Июнь 26, 2020

Insect navigation arises from the coordinated action of concurrent guidance systems but neural mechanisms through which each functions, and are then coordinated, remains unknown. We propose that insects require distinct strategies to retrace familiar routes (route-following) directly return novel terrain (homing) using different aspects frequency encoded views processed in pathways. also demonstrate how Central Complex Mushroom Bodies regions insect brain may work tandem coordinate directional output cues a contextually switched ring-attractor inspired by recordings. The resultant unified model reproduces behavioural data series cue conflict experiments realistic animal environments offers testable hypotheses where process visual cues, utilise information they provide their outputs achieve adaptive behaviours observed wild.

Язык: Английский

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The head direction circuit of two insect species

eLife, Год журнала: 2020, Номер 9

Опубликована: Июль 6, 2020

Recent studies of the Central Complex in brain fruit fly have identified neurons with activity that tracks animal’s heading direction. These are part a neuronal circuit dynamics resembling those ring attractor. The homologous other insects has similar topographic structure but significant structural and connectivity differences. We model patterns two insect species to investigate effect these differences on circuit. illustrate found locusts can also operate as attractor inhibition pattern enable respond faster changes while additional recurrent connections render locust more tolerant noise. Our findings demonstrate subtle projection performance need for comparative approach neuroscience.

Язык: Английский

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Neural circuit mechanisms for steering control in walkingDrosophila

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2020, Номер unknown

Опубликована: Апрель 5, 2020

Abstract Orienting behaviors provide a continuous stream of information about an organism’s sensory experiences and plans. Thus, to study the links between sensation action, it is useful identify neurons in brain that control orienting behaviors. Here we describe descending Drosophila predict influence orientation (heading) during walking. We show these cells have specialized functions: whereas one cell type predicts sustained low-gain steering, other transient high-gain steering. These latter integrate internally-directed steering signals from head direction system with stimulus-directed multimodal pathways. The inputs are organized produce “see-saw” commands, so increasing output hemisphere accompanied by decreasing hemisphere. Together, our results internal external drives integrated motor commands different timescales, for flexible precise space.

Язык: Английский

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A projectome of the bumblebee central complex

eLife, Год журнала: 2021, Номер 10

Опубликована: Сен. 15, 2021

Insects have evolved diverse and remarkable strategies for navigating in various ecologies all over the world. Regardless of species, insects share presence a group morphologically conserved neuropils known collectively as central complex (CX). The CX is navigational center, involved sensory integration coordinated motor activity. Despite fact that our understanding behavior comes predominantly from ants bees, most what we know about underlying neural circuitry such work fruit flies. Here, aim to close this gap, by providing first comprehensive map major columnar neurons their projection patterns bee. We find numerous components circuit appear be highly between fly bee, but also highlight several key differences which are likely important functional ramifications.

Язык: Английский

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