Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"central complex"”.
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An Angular Working-Memory Signal that Guides Drosophila Navigational Trajectories
… in a well-studied brain region called the central complex help guide navigation. Previous work has shown that “compass neurons” in the central complex track the fly’s heading angle, while a second set of central complex neurons track the fly’s goal angle. The difference between the fly’s …
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Life on the Edge: Insights into the Neural and Behavioral Algorithms of Plume Tracking
… the fact that plumes are invisible and spatially complex, precluding an understanding of the exact sensory experience of an animal. We have been leveraging the concise architecture of the Drosophila olfactory and navigational circuitry to elucidate the neural mechanisms underlying odor navigation. …
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A Neuronal Circuit Motif for Leaky Vector Integration
… integration are thought to be implemented in the central complex. Experimenters have shown that contiguously arrayed populations of neurons in the Drosophila fan-shaped body, a substructure of the central complex, display sinusoidally shaped bumps of calcium activity that signal vectors relevant …
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Petrogenesis of hybrid porphyry pipes and evolution of alkaline magmas in the Kanabeam Igneous Complex, Southern Namibia
… and was emplaced at approximately 500Ma. One central complex within the KBIP is the Kanabeam Igneous Complex (KIC) where practically all the rock types found in the province are represented and include nepheline syenites, quartz syenites as well as granites. In addition to these plutonic …
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Head and protocerebral patterning in the spider Parasteatoda tepidariorum
… for spatial orientation and object recognition (central complex) and olfactory learning and memory (mushroom bodies/MB). However, it is not clear whether the chelicerate arcuate body and spider MB are homologous to insect central complex and MB, respectively. The overall aim of this thesis is the …
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A Neuronal Circuit Architecture for Angular Integration in Drosophila
… I describe a set of neurons in the Drosophila central complex whose wiring and physiology provide a means to shift an angular heading estimate when the fly turns. I show that these clockwise- and counterclockwise-shifting neurons each exist in two subtypes, with spatiotemporal activity profiles …
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How Neuronal Stem Cells Acquire and Maintain their Identity
… are Type II NSCs, whose progeny build the central complex, the functional analogue of the vertebrate hippocampus. A previous transcriptome study in the Barros/Bossing lab identified transcripts potentially conferring molecular identity within Type II NSC. We selected 8 nucleic-acid binding …
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Building an Allocentric Traveling-Direction Signal Via Vector Computation
… operations. Here we show how the Drosophila central complex, a region implicated in goal-directed navigation, performs vector arithmetic. First, we describe a neural signal in the fan-shaped body that explicitly tracks a fly's allocentric traveling angle, that is, the traveling angle in …
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Converting an Allocentric Goal Direction into an Egocentric Steering Signal in Drosophila
… a neuronal circuit in the Drosophila central complex that compares internally generated estimates of the fly's heading and goal angles––both encoded in world-centred, or allocentric, coordinates––to generate a body-centred, or egocentric, steering signal. Past work has argued that the …
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A Scent of Direction: Exploring Adaptive Olfactory Navigation in Drosophila
… cues, such as odors, to navigate through complex and often dynamic landscapes. While olfactory navigation has traditionally been modeled as a reflexive behavior driven by immediate sensory cues, whether flies can leverage more sophisticated strategies, integrating sensory input with …
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Functional analysis of embryonic brain development in Tribolium castaneum
Das Gehirn eines Tieres ermöglicht unter anderem die Steuerung von komplexen Verhaltensweisen wie beispielsweise Orientierung und gerichtete Bewegungen. In Insekten wurde für jene Prozesse ein übergeordnetes Zentrum entdeckt, das Zentralkomplex genannt wird. Es besteht aus fünf neuropilären …