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SUMMARY:Multiplexed representations of decision content and uncertainty in
  visual processin - Dominik Straub\; Ishan Kalburge
DTSTART:20260226T090000Z
DTEND:20260226T110000Z
UID:TALK245176@talks.cam.ac.uk
CONTACT:124819
DESCRIPTION:In this journal club\, we will discuss two recent studies that
  aim to clarify how the brain computes decision confidence alongside decis
 ion content. We will first discuss recent work from Boundy-Singer et al. (
 2025) that suggests that confidence judgements reflect a subject’s estim
 ate of decision reliability. They corroborate this proposal with neural re
 cording data from two monkeys performing a simple orientation discriminati
 on task\, which demonstrated that both decision content and decision confi
 dence judgements are decodable from V1 but decision confidence requires ad
 ditional nonlinearities to be decoded successfully from V1 activity\, as i
 s expected from a two-stage process model of decision confidence.\n\nIn a 
 related study\, Vivar-Lazo and Fetsch (2025) examined the temporal aspects
  of choice and confidence computations. They trained two monkeys in a very
  similar task to report both their perceptual decision and their confidenc
 e with a single eye movement\, while neural activity was recorded in later
 al intraparietal cortex (LIP)\, a region involved in attention and plannin
 g of saccades. Using two evidence accumulation models\, they investigated 
 whether confidence is determined only after choice commitment (the serial 
 model) or during decision formation (the parallel model). While quantitati
 ve behavioural model comparison was inconclusive\, with both models descri
 bing choices and reaction times well\, only the parallel model was able to
  account for the observed increase of confidence with stimulus strength in
  error trials. The activity of LIP neurons was also more consistent with t
 he parallel evidence accumulation model.\n\nTaken together\, these studies
  show promising evidence that decision confidence is represented concurren
 tly with decision content\, even in early sensory areas\, and suggest that
  such representations could be transformed for direct access in downstream
  areas.\n\nReferences:\n\nBoundy-Singer\, Z. M.\, Ziemba\, C. M.\, & Goris
 \, R. L. (2025). Sensory population activity reveals downstream confidence
  computations in the primate visual system. _Proceedings of the National A
 cademy of Sciences_\, _122_(26)\, e2426441122. https://doi.org/10.1073/pna
 s.2426441122\n\nVivar-Lazo\, M.\, & Fetsch\, C. R. (2025). Neural basis of
  concurrent deliberation toward a choice and confidence judgment. _Nature 
 neuroscience_\, 1-12. https://doi.org/10.1038/s41593-025-02116-9
LOCATION:CBL Seminar Room\, Engineering Department\, 4th floor Baker build
 ing
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