{"id":6605,"date":"2016-12-13T09:22:14","date_gmt":"2016-12-13T09:22:14","guid":{"rendered":"http:\/\/www.neurodegenerationresearch.eu\/?p=6605"},"modified":"2016-12-13T09:22:14","modified_gmt":"2016-12-13T09:22:14","slug":"watching-in-3d-as-neurons-in-a-living-mouse-brain-communicate","status":"publish","type":"post","link":"https:\/\/neurodegenerationresearch.eu\/hr\/2016\/12\/watching-in-3d-as-neurons-in-a-living-mouse-brain-communicate\/","title":{"rendered":"Watching in 3D as Neurons in a Living Mouse Brain Communicate"},"content":{"rendered":"<p>Researchers are developing technology that would make it possible to record brain activity as it plays out across networks.<\/p>\n<p>In research published in <em>Nature Methods<\/em>, they recorded the activity of thousands of neurons layered within three-dimensional sections of brain as they signaled to one another in a living mouse.<\/p>\n<p>This type of recording presents a considerable technical challenge because it requires tools capable of capturing short-lived events within individual cells, all while observing large volumes of brain tissue.<\/p>\n<p>The researchers first succeeded in developing a light-microscope\u2013based approach to observing the activity within a whole 302-neuron roundworm brain, before moving on to the 100,000-neuron organ of a larval zebrafish. Their next target, the mouse brain, is more challenging for two reasons: Not only is it more complex, with about 70 million neurons, but the rodent brain is also opaque, unlike the more transparent worm and larval fish brains.<\/p>\n<p>To make the activity of neurons visible, they had to be altered. The researchers engineered the mice so their neurons could emit fluorescent light when they signal to one another. The stronger the signal, the brighter the cells shine.<\/p>\n<p>The microscopy system they developed had to meet competing demands: It needed to generate a spherically shaped spot, slightly smaller than the neurons and capable of efficiently exciting fluorescence from them. Meanwhile, it also had to move quickly enough to scan the activity of thousands of these cells in three dimensions as they fire in real time.<\/p>\n<p>The team accomplished this using a technique called \u201clight sculpting,\u201d in which short pulses of laser light, each lasting only a quadrillionth of a second, are dispersed into their colored components. These are then brought back together to generate the \u201csculpted\u201d excitation sphere.<\/p>\n<p>This sphere is scanned to illuminate the neurons within a plane, then refocused on another layer of neurons above or below, allowing neural signals to be recorded in three dimensions. (This was done while the mouse\u2019s head was immobilized, but its legs were free to run on a customized treadmill.)<\/p>\n<p>In this way, the researchers recorded the activity within one-eighth of a cubic millimeter of the cortex, of the animal\u2019s brain, a volume that represents the majority of a unit known as a cortical column. By simultaneously capturing and analyzing the dynamic activity of the neurons within a cortical column, researchers think they might be able to understand brain computation as a whole. In this case, the section of cortex studied is responsible for planning movement.<\/p>\n<p>The researchers are currently working to capture the activity of an entire such unit.<\/p>\n<p><strong>Paper: <a href=\"http:\/\/www.nature.com\/nmeth\/journal\/vaop\/ncurrent\/full\/nmeth.4040.html\">\u201cFast volumetric calcium imaging across multiple cortical layers using sculpted light\u201d<\/a><br \/>\nReprinted from materials provided by <a href=\"http:\/\/newswire.rockefeller.edu\/2016\/10\/31\/researchers-watch-in-3d-as-neurons-talk-to-each-other-in-a-living-mouse-brain\/\">Rockefeller University<\/a>.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Researchers are developing technology that would make it possible to [&hellip;]<\/p>\n<a href=\"https:\/\/neurodegenerationresearch.eu\/hr\/2016\/12\/watching-in-3d-as-neurons-in-a-living-mouse-brain-communicate\/\">View Post<\/a>","protected":false},"author":3,"featured_media":2875,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[22],"tags":[],"class_list":["post-6605","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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