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===Brain imaging=== Neural activity can be recorded optically by genetically encoding neurons with reversible fluorescent markers such as [[GCaMP]] that indicate the presence of [[calcium ions]] in real time. Since [[light field microscopy]] captures full volume information in a single frame, it is possible to monitor neural activity in individual neurons randomly distributed in a large volume at video framerate.<ref>Grosenick, 2009, 2017; Perez, 2015</ref> Quantitative measurement of neural activity can be done despite optical aberrations in brain tissue and without reconstructing a volume image,<ref>Pegard, 2016</ref> and be used to monitor activity in thousands of neurons.<ref>Grosenick, 2017</ref>
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