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SUMMARY:Sensory evidence accumulation using optic flow in a naturalistic n
 avigation task - Paul Bays
DTSTART:20230517T140000Z
DTEND:20230517T150000Z
UID:TALK201043@talks.cam.ac.uk
CONTACT:Adam Triabhall
DESCRIPTION:This week we will discuss and debate a very recent paper by Al
 efantis and colleagues\, published in the Journal of Neuroscience (2022).\
 n\nAbstract: “Sensory evidence accumulation is considered a hallmark of 
 decision-making in noisy environments. Integration of sensory inputs has b
 een traditionally studied using passive stimuli\, segregating perception f
 rom action. Lessons learned from this approach\, however\, may not general
 ize to ethological behaviors like navigation\, where there is an active in
 terplay between perception and action. We designed a sensory-based sequent
 ial decision task in virtual reality in which humans and monkeys navigated
  to a memorized location by integrating optic flow generated by their own 
 joystick movements. A major challenge in such closed-loop tasks is that su
 bjects' actions will determine future sensory input\, causing ambiguity ab
 out whether they rely on sensory input rather than expectations based sole
 ly on a learned model of the dynamics. To test whether subjects integrated
  optic flow over time\, we used three independent experimental manipulatio
 ns\, unpredictable optic flow perturbations\, which pushed subjects off th
 eir trajectory\; gain manipulation of the joystick controller\, which chan
 ged the consequences of actions\; and manipulation of the optic flow densi
 ty\, which changed the information borne by sensory evidence. Our results 
 suggest that both macaques (male) and humans (female/male) relied heavily 
 on optic flow\, thereby demonstrating a critical role for sensory evidence
  accumulation during naturalistic action-perception closed-loop tasks” (
 Alefantis et al.\, 2022).\n\nReference: Alefantis\, P.\, Lakshminarasimhan
 \, K.\, Avila\, E.\, Noel\, J. P.\, Pitkow\, X.\, & Angelaki\, D. E. (2022
 ). Sensory Evidence Accumulation Using Optic Flow in a Naturalistic Naviga
 tion Task. The Journal of Neuroscience\, 42(27)\, 5451–5462. https://doi
 .org/10.1523/JNEUROSCI.2203-21.2022
LOCATION:Zoom link: www.bayslab.org/craikjc
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