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Conference | Brain
From 6/28/2021 to 6/28/2021
Li ZHAOPING (Tübingen MPI, Germany) will give a talk on Zoom on June 28th.
(1) Zhaoping, L. (2019) A new framework for understanding vision from the
perspective of the primary visual cortex Current Opinion in
Neurobiology, volume 58, page 1-10.
(2) Zhaoping, L. (2020) The flip tilt illusion: visible in peripheral vision as
predicted by the Central-Peripheral Dichotomy (CPD). i-Perception,
(3) Zhaoping, L. (2021) Contrast-reversed binocular dot-pairs in random-dot
stereograms for depth perception in central visual field: Probing the dynamics
of feedforward-feedback processes in visual inference, Vision
Research, vol. 186, pages 124-139.
V1SH is the V1 Saliency Hypothesis, and CPD is the Central-Peripheral Dichotomy.I will explain how they motivate a new framework: Visual attention selects only a tiny fraction of visual input information for further processing. Selection starts in the primary visual cortex (V1), which creates a bottom-up saliency map (V1SH) to guide the fovea to selected visual locations via gaze shifts.This motivates a new framework that views vision as consisting of encoding, selection, and decoding stages, placing selection on center stage. It suggests a massive loss of non-selected information from V1 downstream along the visual pathway. Hence, feedback from downstream visual cortical areas to V1 for better decoding (recognition), through analysis-by- synthesis, should query for additional information and be mainly directed at the foveal region (CPD). Accordingly, non-foveal vision is not only poorer in spatial resolution, but also more susceptible to many illusions. I will show some illusions arising from V1's feedforward inputs limited by the attentional bottleneck, and use random-dot stereograms to illustrate how top-down feedback constructively utilizes the feedforward inputs in some visual inferences and vetoes feedforward inputs in other cases, depending on the nature of the feedforward inputs
CEA is a French government-funded technological research organisation in four main areas: low-carbon energies, defense and security, information technologies and health technologies. A prominent player in the European Research Area, it is involved in setting up collaborative projects with many partners around the world.