From V1SH to CPD: A New Framework for Understanding Vision

18 March 2021, 1.00 PM - 18 March 2021, 2.00 PM

Zhaoping Li (Professor of Cognitive Science, Head of Sensory and Sensorimotor Systems, Max Planck Institute for Biological Cybernetics, University of Tuebingen)


Hosted by the Generalisation in Mind & Machine research group


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.  Some background/details are in this link .  I will also show the latest findings, including a peripheral illusion predicted by this framework and a stereo vision paradigm as an example to investigate the analysis-by-synthesis process in the top-down feedback for visual inference in central vision.


Contact information

Contact Abla Hatherell with any enquiries. 

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