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Updated: Oct 26, 2025

Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing
Published on: February 23, 2024
Adaptive mechanisms of visual motion discrimination, integration, and segregation
Boris Peñaloza1, Michael H Herzog2, Haluk Öğmen3
1Perceptual and Cognitive Dynamics Laboratory, Department of Electrical & Computer Engineering, University of Denver, Denver, CO 80208, USA; Universidad Tecnológica de Panamá, Panama.
Abstract:
Under ecological conditions, the luminance impinging on the retina varies within a dynamic range of 220 dB. Stimulus contrast can also vary drastically within a scene and eye movements leave little time for sampling luminance. Given these fundamental problems, the human brain allocates a significant amount of resources and deploys both structural and functional solutions that work in tandem to compress this range. Here we propose a new dynamic neural model built upon well-established canonical neural mechanisms. The model consists of two feed-forward stages. The first stage encodes the stimulus spatially and normalizes its activity by extracting contrast and discounting the background luminance. These normalized activities allow a second stage to implement a contrast-dependent spatial-integration strategy. We show how the properties of this model can account for adaptive properties of motion discrimination, integration, and segregation.
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