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Archive by tag | neural circuits

30 May 2012 | 20:52 BST

Positive feedback drives network (and manuscript) maturation.

Posted by Noah Gray | Categories: New in Nature, Noah Gray

Positive feedback drives network (and manuscript) maturation.

It really is an embarrassment of riches here at Nature these days, what with so many excellent neuroscience-related studies emerging. Just in the last couple of weeks, we’ve had the following studies:  … Read more

Tags:

  • appeal
  • basal ganglia
  • dopamine
  • editorial
  • Nature
  • neural circuits
  • neural plasticity
  • neurons
  • neuroscience
  • optogenetics
  • striatum
  • synaptogenesis
  • uncaging

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10 May 2012 | 21:24 BST

“There is no spoon…”: Paralyzed fish navigates virtual environment while we watch its brain

Posted by Noah Gray | Categories: New in Nature, Noah Gray

Overlaid on the micrograph of the fish is a slice of its brain measured with a laser scanning microscope, in which single neurons are visible.

Sometimes an experiment will just reach off the page and slap you in the face, demanding attention. This happens to me every so often and I must admit, our latest paper from the lab of Florien Engert induced such an experience. There have been several cool, technical tours-de-force (is that proper grammar??) over the last few years involving different creatures navigating in a virtual environment while neuronal activity was monitored. These include a mouse running on a spherical treadmill, as well as a fly marching along a similar treadmill-style ball. But in these examples, having the subject head-fixed (for the stability of recordings in the brain, either with electrodes or through imaging) was moderately non-intrusive since walking motions were independent of the head. The same can’t be said for the subject in this latest example of a virtual reality navigator: a wriggling, swimming fish. Therefore, a more creative solution had to be sought and in a paper published online yesterday, Ahrens, Engert and colleagues decided that paralysis was the way to go in order to follow the neural activity of this navigating fish.  Read more

Tags:

  • adaptation
  • calcium imaging
  • cerebellum
  • decoding
  • motor learning
  • Nature
  • navigation
  • neural circuits
  • neural plasticity
  • neurons
  • neuroscience
  • virtual reality
  • zebrafish

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14 Mar 2012 | 21:40 GMT

Parietal decision sequences – and more of mice and monkeys

Posted by I-han Chou | Categories: I-han Chou, New in Nature

Image: Eduardo Dias-Ferreira and Rui Costa

Back in the 1990’s, one of the most intense battlegrounds in systems neuroscience was in monkey posterior parietal cortex. Labs competed to claim what a little strip of cortex called lateral intraparietal area (LIP) really does – decision, movement planning, attention, reward, or all of the above – mostly using single cell recording in behaving monkey. The experiments were (and still are) tough: standard operating procedure requires a well-trained monkey who will perform hundreds if not thousands of trials a day and then isolating neurons one at a time to find ones that respond during some interesting part of the trial. And then lots and lots of repetition so that you can average over many neurons. All things considered, it’s remarkable how much the field has been able to learn with this toolbox.  Read more

Tags:

  • decision
  • Nature
  • neural circuits
  • neuroscience
  • parietal cortex
  • primate
  • rodent

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09 Mar 2012 | 20:14 GMT

The Fine Architecture of Learning and Joint Publication

Posted by Noah Gray | Categories: New in Nature, Noah Gray

Chronic in vivo imaging of dendritic spines. (image courtesy of https://openwiki.janelia.org/wiki/display/SvobodaLab/Research)

You warily walk into a dark compartment, wondering if there is food inside. Suddenly there is a loud tone and you feel an uncomfortable surge of electricity through your feet. This goes without saying, but it won’t take long before you will learn to be afraid of that tone. However, over time, you hear the tone without the shock, and slowly (foolishly??) accept that the previous connection may no longer hold.  Read more

Tags:

  • dendritic spines
  • fear learning
  • learning
  • motor learning
  • Nature
  • neural circuits
  • neural plasticity
  • neurons
  • neuroscience
  • structural plasticity

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22 Feb 2012 | 20:16 GMT

Layer magic and monkey business

Posted by I-han Chou | Categories: I-han Chou, New in Nature

Image from Wikipedia

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.  Read more

Tags:

  • Nature
  • neural circuits
  • neuroscience
  • optogenetics
  • primate research
  • visual cortex

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About this blog

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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