August 2023
Volume 23, Issue 9
Open Access
Vision Sciences Society Annual Meeting Abstract  |   August 2023
Independence, not interactions: What simulations suggest about ventral and dorsal pathways.
Author Affiliations
  • Anne B. Sereno
    Psychological Sciences Department, Purdue University
    Weldon School of Biomedical Engineering, Purdue University
  • Zhixian Han
    Weldon School of Biomedical Engineering, Purdue University
Journal of Vision August 2023, Vol.23, 4606. doi:https://doi.org/10.1167/jov.23.9.4606
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      Anne B. Sereno, Zhixian Han; Independence, not interactions: What simulations suggest about ventral and dorsal pathways.. Journal of Vision 2023;23(9):4606. https://doi.org/10.1167/jov.23.9.4606.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Extensive research suggests visual processing proceeds along two relatively segregated streams into temporal and parietal cortices, important for object and spatial processing, respectively. However, recent evidence suggests that object and spatial processing is present in both visual pathways. The functional significance of the presence of object and spatial properties in both pathways is not yet fully understood. Findings using a population decoding approach in physiology suggest there are fundamental differences between ventral and dorsal processing of both shape and space. Using artificial neural networks, we try to address whether the representations of object in dorsal stream and space in ventral stream play a functional role in spatial and object recognition, respectively. Our simulation results show that a model ventral and a model dorsal pathway, separately trained to do object and spatial recognition, respectively, each actively retained information about both identity and space. In addition, we show that these networks retained different amounts and kinds of identity and spatial information. Finally, we show that this differently retained information about object and space in a two-pathway model (as opposed to single-pathway model) was necessary to accurately and optimally recognize, localize, and, in multiple object displays, successfully bind objects and locations. A computational approach provides a framework to test the functional consequences of two independent visual pathways (with no cross connections) and shows that the findings can provide insight into recent contradictory physiological findings. Critical unanswered questions and implications for current and future understanding of object and spatial processing will be discussed.

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