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Categorical facilitation with equally discriminable colors

Categorical facilitation with equally discriminable colors
Categorical facilitation with equally discriminable colors
This study investigates the impact of language on color perception. By categorical facilitation, we refer to an aspect of categorical perception, in which the linguistic distinction between categories affects color discrimination beyond the low-level, sensory sensitivity to color differences. According to this idea, discrimination performance for colors that cross a category border should be better than for colors that belong to the same category when controlling for low-level sensitivity. We controlled for sensitivity by using colors that were equally discriminable according to empirically measured discrimination thresholds. To test for categorical facilitation, we measured response times and error rates in a speeded discrimination task for suprathreshold stimuli. Robust categorical facilitation occurred for five out of six categories with a group of inexperienced observers, namely for pink, orange, yellow, green, and purple. Categorical facilitation was robust against individual variations of categories or the laterality of target presentation. However, contradictory effects occurred in the blue category, most probably reflecting the difficulty to control effects of sensory mechanisms at the green–blue boundary. Moreover, a group of observers who were highly familiar with the discrimination task did not show consistent categorical facilitation in the other five categories. This trained group had much faster response times than the inexperienced group without any speed–accuracy trade-off. Additional analyses suggest that categorical facilitation occurs when observers pay attention to the categorical distinction but not when they respond automatically based on sensory feed-forward information.
1534-7362
1-33
Witzel, Christoph
dfb994f1-7007-441a-9e1a-ddb167f44166
Gegenfurtner, Karl R.
4a15dafb-60db-41c6-a845-b0f37bee8d3e
Witzel, Christoph
dfb994f1-7007-441a-9e1a-ddb167f44166
Gegenfurtner, Karl R.
4a15dafb-60db-41c6-a845-b0f37bee8d3e

Witzel, Christoph and Gegenfurtner, Karl R. (2015) Categorical facilitation with equally discriminable colors. Journal of Vision, 15 (8), 1-33, [22]. (doi:10.1167/15.8.22).

Record type: Article

Abstract

This study investigates the impact of language on color perception. By categorical facilitation, we refer to an aspect of categorical perception, in which the linguistic distinction between categories affects color discrimination beyond the low-level, sensory sensitivity to color differences. According to this idea, discrimination performance for colors that cross a category border should be better than for colors that belong to the same category when controlling for low-level sensitivity. We controlled for sensitivity by using colors that were equally discriminable according to empirically measured discrimination thresholds. To test for categorical facilitation, we measured response times and error rates in a speeded discrimination task for suprathreshold stimuli. Robust categorical facilitation occurred for five out of six categories with a group of inexperienced observers, namely for pink, orange, yellow, green, and purple. Categorical facilitation was robust against individual variations of categories or the laterality of target presentation. However, contradictory effects occurred in the blue category, most probably reflecting the difficulty to control effects of sensory mechanisms at the green–blue boundary. Moreover, a group of observers who were highly familiar with the discrimination task did not show consistent categorical facilitation in the other five categories. This trained group had much faster response times than the inexperienced group without any speed–accuracy trade-off. Additional analyses suggest that categorical facilitation occurs when observers pay attention to the categorical distinction but not when they respond automatically based on sensory feed-forward information.

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Witzel & Gegenfurtner (2015) Categorical facilitation with equally discriminable colors - Version of Record
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Submitted date: 29 July 2014
e-pub ahead of print date: 30 June 2015
Published date: 30 June 2015

Identifiers

Local EPrints ID: 438220
URI: http://eprints.soton.ac.uk/id/eprint/438220
ISSN: 1534-7362
PURE UUID: 5a2e76fc-dd9c-4c30-8ce0-1634715032d1
ORCID for Christoph Witzel: ORCID iD orcid.org/0000-0001-9944-2420

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Date deposited: 04 Mar 2020 17:31
Last modified: 17 Mar 2024 04:00

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Author: Karl R. Gegenfurtner

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