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Alberto Bernacchia (CBL)
Tuesday 07 February 2017, 16:00-17:00
Computational Neuroscience Journal Club
- đ¤ Speaker: Alberto Bernacchia (CBL)
- đ Date & Time: Tuesday 07 February 2017, 16:00 - 17:00
- đ Venue: Cambridge University Engineering Department, CBL, BE-438 (http://learning.eng.cam.ac.uk/Public/Directions)
Abstract
Alberto Bernacchia will cover:
- History-dependent variability in population dynamics during evidence accumulation in cortex
- Ari S Morcos, Christopher D Harvey
- Nature Neuroscience (October 2016)
- http://www.nature.com/neuro/journal/v19/n12/full/nn.4403.html
Abstract: We studied how the posterior parietal cortex combines new information with ongoing activity dynamics as mice accumulate evidence during a virtual navigation task. Using new methods to analyze population activity on single trials, we found that activity transitioned rapidly between different sets of active neurons. Each event in a trial, whether an evidence cue or a behavioral choice, caused seconds-long modifications to the probabilities that govern how one activity pattern transitions to the next, forming a short-term memory. A sequence of evidence cues triggered a chain of these modifications resulting in a signal for accumulated evidence. Multiple distinguishable activity patterns were possible for the same accumulated evidence because representations of ongoing events were influenced by previous within- and across-trial events. Therefore, evidence accumulation need not require the explicit competition between groups of neurons, as in winner-take-all models, but could instead emerge implicitly from general dynamical properties that instantiate short-term memory.
Series This talk is part of the Computational Neuroscience series.
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