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The Ol1mpiad: concordance of behavioural faculties of stage 1 and stage 3 Drosophila larvae Mapping brain function to brain structure is a fundamental task for neuroscience. For such an endeavour, the Drosophila larva is simple enough to be tractable, yet complex enough to be interesting.
It features about 10, neurons and is capable of various taxes, kineses and Pavlovian conditioning. All its neurons are currently being mapped into a light-microscopical atlas, and Gal4 strains are being generated to experimentally access neurons one at a time. In addition, an electron microscopic reconstruction of its nervous system seems within reach.
Notably, this electron microscope-based connectome is being drafted for a stage 1 larva. This study undertook a survey the behaviour of stage 1 larvae. Quantitatively, stage 1 larvae show lower scores in most tasks, arguably because of their smaller size and lower speed. Qualitatively, however, stage 1 larvae perform strikingly similar to stage 3 larvae in almost all cases. These results bolster confidence in mapping brain structure and behaviour across developmental stages Almeida-Carvalho, Action-based attention in Drosophila melanogaster The mechanism of action selection is a widely shared fundamental process required by animals to interact with the environment and adapt to it.
A key step in this process is the filtering of many "distracting" sensory inputs which may disturb action selection. Because it has been suggested that, beyond sharing common mechanisms, action selection may also be processed by shared circuits in vertebrates and invertebrates, it was asked whether invertebrates showed the ability to filter out "distracting" stimuli to maintain a goal-directed action, as seen in vertebrates.