A projectome of the bumblebee central complex

Sayre, Marcel E.; Templin, Rachel; Chavez, Johanna; Kempenaers, Julian; Heinze, Stanley

doi:10.7554/elife.68911

Cited by 48 publications

(61 citation statements)

References 68 publications

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“…The same study also outlined how a short-term memory of a desired heading could be maintained in the FB of the CX via synapse-weight modulation after the original guidance cue is removed that could support the wind compensation and backtracking behaviours described above. Our model hypothesises the existence of a ring attractor network to optimally integrate the desired heading cues which we suggest could be realised in the complex intra-connections within the FB and the NO ( Hulse et al, 2021 ; Sayre et al, 2021 ). We also hypothesise that different populations of Protocerebral bridge - Fan-shaped body - Nodulus (PFN) neurons in the CX simultaneously store the distinct desired headings computed by the independent navigation systems (e.g.…”

Section: Discussionmentioning

confidence: 88%

“…We also hypothesise that different populations of Protocerebral bridge - Fan-shaped body - Nodulus (PFN) neurons in the CX simultaneously store the distinct desired headings computed by the independent navigation systems (e.g. PI-based home vector is stored in CPU4 neurons [a subset of PFNs]; Stone et al, 2017 ; Hulse et al, 2021 ; Sayre et al, 2021 ). Further, the hypothetical context switching introduced could be achieved by the recently mapped FB-NOc neurons found in the bees ( Sayre et al, 2021 ).…”

Section: Discussionmentioning

confidence: 99%

“…PI-based home vector is stored in CPU4 neurons [a subset of PFNs]; Stone et al, 2017 ; Hulse et al, 2021 ; Sayre et al, 2021 ). Further, the hypothetical context switching introduced could be achieved by the recently mapped FB-NOc neurons found in the bees ( Sayre et al, 2021 ).…”

Section: Discussionmentioning

confidence: 99%

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How the insect central complex could coordinate multimodal navigation

Sun

Yue

Mangan

2021

eLife

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The central complex of the insect midbrain is thought to coordinate insect guidance strategies. Computational models can account for specific behaviours but their applicability across sensory and task domains remains untested. Here we assess the capacity of our previous model (Sun et al., 2020) of visual navigation to generalise to olfactory navigation and its coordination with other guidance in flies and ants. We show that fundamental to this capacity is the use of a biologically-plausible neural copy-and-shift mechanism that ensures sensory information is presented in a format compatible with the insect steering circuit regardless of its source. Moreover, the same mechanism is shown to allow the transfer cues from unstable/egocentric to stable/geocentric frames of reference providing a first account of the mechanism by which foraging insects robustly recover from environmental disturbances. We propose that these circuits can be flexibly repurposed by different insect navigators to address their unique ecological needs.

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Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

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How the insect central complex could coordinate multimodal navigation

Sun

Yue

Mangan

2021

eLife

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“…Lastly, we enabled the addition of connections among CL2 neurons of the same hemisphere during the optimization process. Projection patterns suggest that all CL2 neurons of the same hemisphere branch in the lower unit of the contralateral NO, like P-EN neurons in Drosophila (Wolff et al, 2015) and the bumblebee (Sayre et al, 2021). Optimization converged at a solution with excitatory and inhibitory connections among CL2 neurons branching in the same nodulus.…”

Section: Resultsmentioning

confidence: 99%

“…Franconville et al (2018) reported that connections from E-PG onto P-EN neurons in the PB are mediated by ∆7 neurons. As TB1 and TB2 neurons cross the midline of the locust PB, they are, in addition to contralateral processes observed in some CL1 neurons innervating the innermost columns of the PB (Sayre et al, 2021), candidates for mediating ring closure. An internal compass representation must adapt to a new heading direction when the animal turns.…”

Section: Discussionmentioning

confidence: 99%

Integration of optic flow into the sky compass network in the brain of the desert locust

Zittrell

Pabst

Carlomagno

et al. 2022

Preprint

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Flexible orientation through any environment requires a sense of current relative heading that is updated based on self-motion. Global external cues originating from the sky or the earth's magnetic field and local cues provide a reference frame for the sense of direction. Locally, optic flow may inform about turning maneuvers, travel speed and covered distance. The central complex in the insect brain is associated with orientation behavior and largely acts as a navigation center. Visual information from global celestial cues and local landmarks are integrated in the central complex to form an internal representation of current heading. However, it is largely unclear which neurons integrate optic flow in the central-complex network. We recorded intracellularly from neurons in the locust central complex while presenting lateral grating patterns that simulated translational and rotational motion to identify these sites of integration. Certain types of central complex neurons were sensitive to visual self-motion independent of the type and direction of simulated motion. Columnar neurons innervating the noduli, paired central-complex substructures, were tuned to the direction of simulated horizontal turns. Modelling the connectivity of these neurons with a system of proposed compass neurons can account for rotation-direction specific shifts in the activity profile in the central complex corresponding to turn direction. Our model is similar but not identical to the mechanisms proposed for angular velocity integration in the navigation compass of the fly Drosophila.

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Looking across the gap: Understanding the evolution of eyes and vision among insects

Kittelmann,

McGregor

2024

BioEssays

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The compound eyes of insects exhibit stunning variation in size, structure, and function, which has allowed these animals to use their vision to adapt to a huge range of different environments and lifestyles, and evolve complex behaviors. Much of our knowledge of eye development has been learned from Drosophila, while visual adaptations and behaviors are often more striking and better understood from studies of other insects. However, recent studies in Drosophila and other insects, including bees, beetles, and butterflies, have begun to address this gap by revealing the genetic and developmental bases of differences in eye morphology and key new aspects of compound eye structure and function. Furthermore, technical advances have facilitated the generation of high‐resolution connectomic data from different insect species that enhances our understanding of visual information processing, and the impact of changes in these processes on the evolution of vision and behavior. Here, we review these recent breakthroughs and propose that future integrated research from the development to function of visual systems within and among insect species represents a great opportunity to understand the remarkable diversification of insect eyes and vision.

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A projectome of the bumblebee central complex

Cited by 48 publications

References 68 publications

How the insect central complex could coordinate multimodal navigation

How the insect central complex could coordinate multimodal navigation

Integration of optic flow into the sky compass network in the brain of the desert locust

Looking across the gap: Understanding the evolution of eyes and vision among insects

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