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SUMMARY:Computational Neuroscience Journal Club - Robert Taylor (Bays Lab)
DTSTART:20180220T160000Z
DTEND:20180220T170000Z
UID:TALK101572@talks.cam.ac.uk
CONTACT:Rodrigo Echeveste
DESCRIPTION:Robert Taylor will cover:\n\n• Neural correlates of evidence
  accumulation during value-based decisions revealed via simultaneous EEG-f
 MRI\n\n• M. Andrea Pisauro\, Elsa Fouragnan\, Chris Retzler & Marios G. 
 Philiastides\n\n• Nature Communications (2017)\n\n• https://www.nature
 .com/articles/ncomms15808\n\nAbstract: Current computational accounts posi
 t that\, in simple binary choices\, humans accumulate evidence in favour o
 f the different alternatives before committing to a decision. Neural corre
 lates of this accumulating activity have been found during perceptual deci
 sions in parietal and prefrontal cortex\; however the source of such activ
 ity in value-based choices remains unknown. Here we use simultaneous EEG
 –fMRI and computational modelling to identify EEG signals reflecting an 
 accumulation process and demonstrate that the within- and across-trial var
 iability in these signals explains fMRI responses in posterior-medial fron
 tal cortex. Consistent with its role in integrating the evidence prior to 
 reaching a decision\, this region also exhibits task-dependent coupling wi
 th the ventromedial prefrontal cortex and the striatum\, brain areas known
  to encode the subjective value of the decision alternatives. These result
 s further endorse the proposition of an evidence accumulation process duri
 ng value-based decisions in humans and implicate the posterior-medial fron
 tal cortex in this process. 
LOCATION:Cambridge University Engineering Department\, CBL\, BE4-38 (http:
 //learning.eng.cam.ac.uk/Public/Directions)
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