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Fundamentally different representations of color and motion revealed by individual differences in perceptual scaling
The coordinate frames for color and motion are often defined by three dimensions (e.g., responses from the three types of human cone photoreceptors for color and the three dimensions of space for motion). Does this common dimensionality lead to similar perceptual representations? Here we show that t...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
National Academy of Sciences
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9942855/ https://www.ncbi.nlm.nih.gov/pubmed/36669108 http://dx.doi.org/10.1073/pnas.2202262120 |
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author | Emery, Kara J. Volbrecht, Vicki J. Peterzell, David H. Webster, Michael A. |
author_facet | Emery, Kara J. Volbrecht, Vicki J. Peterzell, David H. Webster, Michael A. |
author_sort | Emery, Kara J. |
collection | PubMed |
description | The coordinate frames for color and motion are often defined by three dimensions (e.g., responses from the three types of human cone photoreceptors for color and the three dimensions of space for motion). Does this common dimensionality lead to similar perceptual representations? Here we show that the organizational principles for the representation of hue and motion direction are instead profoundly different. We compared observers’ judgments of hue and motion direction using functionally equivalent stimulus metrics, behavioral tasks, and computational analyses, and used the pattern of individual differences to decode the underlying representational structure for these features. Hue judgments were assessed using a standard “hue-scaling” task (i.e., judging the proportion of red/green and blue/yellow in each hue). Motion judgments were measured using a “motion-scaling” task (i.e., judging the proportion of left/right and up/down motion in moving dots). Analyses of the interobserver variability in hue scaling revealed multiple independent factors limited to different local regions of color space. This is inconsistent with the influences across a broad range of hues predicted by conventional color-opponent models. In contrast, variations in motion scaling were characterized by more global factors plausibly related to variation in the relative weightings of the cardinal spatial axes. These results suggest that although the coordinate frames for specifying color and motion share a common dimensional structure, the perceptual coding principles for hue and motion direction are distinct. These differences might reflect a distinction between the computational strategies required for the visual analysis of spatial vs. nonspatial attributes of the world. |
format | Online Article Text |
id | pubmed-9942855 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | National Academy of Sciences |
record_format | MEDLINE/PubMed |
spelling | pubmed-99428552023-07-20 Fundamentally different representations of color and motion revealed by individual differences in perceptual scaling Emery, Kara J. Volbrecht, Vicki J. Peterzell, David H. Webster, Michael A. Proc Natl Acad Sci U S A Biological Sciences The coordinate frames for color and motion are often defined by three dimensions (e.g., responses from the three types of human cone photoreceptors for color and the three dimensions of space for motion). Does this common dimensionality lead to similar perceptual representations? Here we show that the organizational principles for the representation of hue and motion direction are instead profoundly different. We compared observers’ judgments of hue and motion direction using functionally equivalent stimulus metrics, behavioral tasks, and computational analyses, and used the pattern of individual differences to decode the underlying representational structure for these features. Hue judgments were assessed using a standard “hue-scaling” task (i.e., judging the proportion of red/green and blue/yellow in each hue). Motion judgments were measured using a “motion-scaling” task (i.e., judging the proportion of left/right and up/down motion in moving dots). Analyses of the interobserver variability in hue scaling revealed multiple independent factors limited to different local regions of color space. This is inconsistent with the influences across a broad range of hues predicted by conventional color-opponent models. In contrast, variations in motion scaling were characterized by more global factors plausibly related to variation in the relative weightings of the cardinal spatial axes. These results suggest that although the coordinate frames for specifying color and motion share a common dimensional structure, the perceptual coding principles for hue and motion direction are distinct. These differences might reflect a distinction between the computational strategies required for the visual analysis of spatial vs. nonspatial attributes of the world. National Academy of Sciences 2023-01-20 2023-01-24 /pmc/articles/PMC9942855/ /pubmed/36669108 http://dx.doi.org/10.1073/pnas.2202262120 Text en Copyright © 2023 the Author(s). Published by PNAS. https://creativecommons.org/licenses/by-nc-nd/4.0/This article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (https://creativecommons.org/licenses/by-nc-nd/4.0/) . |
spellingShingle | Biological Sciences Emery, Kara J. Volbrecht, Vicki J. Peterzell, David H. Webster, Michael A. Fundamentally different representations of color and motion revealed by individual differences in perceptual scaling |
title | Fundamentally different representations of color and motion revealed by individual differences in perceptual scaling |
title_full | Fundamentally different representations of color and motion revealed by individual differences in perceptual scaling |
title_fullStr | Fundamentally different representations of color and motion revealed by individual differences in perceptual scaling |
title_full_unstemmed | Fundamentally different representations of color and motion revealed by individual differences in perceptual scaling |
title_short | Fundamentally different representations of color and motion revealed by individual differences in perceptual scaling |
title_sort | fundamentally different representations of color and motion revealed by individual differences in perceptual scaling |
topic | Biological Sciences |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9942855/ https://www.ncbi.nlm.nih.gov/pubmed/36669108 http://dx.doi.org/10.1073/pnas.2202262120 |
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