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A model for the early stages of motion processing based on spatial and temporal edge detection by X-cells

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image of Spatial Vision
For more content, see Multisensory Research and Seeing and Perceiving.

A model for the early stages of motion processing in the visual cortex is presented. The 'building block' for this model is the 'rebound response', which is the neuronal response evoked when a sufficient inhibitory stimulus is turned off. This response enables detection of temporal changes when the stimulus involves spatial changes. The model suggests that adjacent subunits in primary cortical cells have different weight functions for rebound responses, and thus a synergistic type of response is evoked in the preferred direction, which is predicted for both light and dark stimuli. Predictions of the model for different stimuli and receptive field structures are discussed. It appears to be more economical than previous motion models.

Affiliations: 1: Biomedical Engineering Department, Faculty of Engineering, Tel Aviv University, Tel Aviv, Israel; 2: Technion, Haifa, Israel


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