IBS Institute for Basic Science

Probing primate visual system during the natural modes of vision

Soo Hyun Park, Ph.D.

July 21(Thu) - July 21(Thu), 2022


N Centre 86314 & ZOOM (ID: 728-142-6028)

CNIR Seminar

Date:  11AM, Thursday, July 21st

Place: N센터 86314호 & ZOOM

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Speaker: Soo Hyun Park, Ph.D.

(Section on Cognitive Neurophysiology and Imaging, NIMH/NIH)

Title: Probing primate visual system during the natural modes of vision

Abstract: In visual neuroscience, neurons or areas are characterized by their visual feature selectivity. This captures only a fraction of how the visual system works because a given neuron or area is always part of a larger network. In our everyday vision, the whole visual system continuously engages as we actively interact with the world. In this talk, I will present my recent studies that focus on the local and global functional networks during dynamic visual experience by utilizing a movie-watching paradigm in macaques and marmosets. In a series of work looking at the face-processing system in the macaque inferotemporal cortex, I developed a novel single-unit fMRI mapping approach. This approach compares the video-driven activity of single neurons to that of the whole brain. It offers a unique way of studying individual visual neurons in relation to their whole-brain functional networks, instead of namable visual features of the stimulus. Using this approach, I revealed that a local face-selective region contains a mixture of functional subpopulations of cells characterized with distinct whole-brain networks. These subpopulations were shared across spatially separated face-selective regions, suggesting parallel subnetworks distributed within the face-processing system. In an ongoing study in marmoset monkeys, using calcium imaging with a head-mounted miniscope, I am asking how the interactions between neurons within a local circuitry unfold at multiple spatiotemporal scales during free viewing of videos. In the future, I plan to continue to probe the primate social visual system in marmoset monkeys during more natural modes of vision to advance our understanding of how the visual system processes dynamic, continuous visual inputs in real-time to interact with the world.