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Vertebrate and most invertebrate organisms interact with their environment through processes of adaptation and learning. Such processes are generally controlled by complex networks of nerve cells, or neurons, and their interactions. Neurons are characterized by all-or-none discharges—the spikes - and the time series corresponding to the sequences of the discharges—the spike trains—carry most of the...
Cerebral aneurysms arise at the bifurcation of blood vessels. They are primarily saccular in shape, but may have additional lobules or “nipples”. Far less commonly, fusiform dilatation or ectasia of intracranial vessels occurs and in some cases may be associated with connective tissue or atherosclerotic disease. Most saccular aneurysms occur in relation to the anterior cerebral artery (35%), followed...
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