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Layer magic and monkey business

We’ve known for over a century that sensory cortex is arranged in distinct layers, each containing a different make up of neuronal types and projection patterns, but we don’t actually know that much about the actual computations performed in each layer.  Today a paper from Massimo Scanziani’s lab takes a big step towards cracking the function of the bottom layer (layer 6) in mice. Layer 6 neurons project both to upper cortical layers and to the lateral geniculate nucleus in the thalamus, which itself is the primary input to cortex, and so are primed to play a large modulatory role. Using a monumental combination of optogenetics, intracellular recording, and behavioral testing, the paper convincingly makes the case that layer 6 controls the gain of visual responses of upper layer neurons (i.e. 

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Action Potential is a forum operated by neuroscience editors at Nature for the entire neuroscience community. We'll discuss what's new and exciting in science, be it in our journals or elsewhere, as well as science policy and publishing and provide updates from major meetings. Although we provide the opportunity to comment as a service to the community, we do not endorse all viewpoints represented here. To contact the contributors directly with confidential questions or suggestions for future entries, please e-mail n.gray@us.nature.com.
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