Whether the categories of one's native language shape perception itself is a classic question for which color is the canonical test case. Brown, Lindsey, and Guckes (2011) found no categorical facilitation and no right-visual-field advantage for green-blue visual search once low-level sensory differences were modeled with perceptual scaling and a cone-opponent null model, directly contradicting positive lateralized findings from other laboratories. This problem asks for a controlled empirical determination of whether language-derived color categories ever modulate the perception of color itself — as distinct from low-level sensory confounds and post-perceptual decision, memory, or response-bias processes — and for a delimitation of the stimulus, task, timing, and neural conditions under which such categorical effects arise or disappear, so as to address the conflicting positive and null literatures.

Background

Linguistic relativity (the Sapir-Whorf hypothesis) is the proposal that the categories of the language one speaks influence non-linguistic thought, and color has served as its test case for four decades because languages divide the visible spectrum differently: English has separate basic terms "green" and "blue", whereas some languages use a single term covering both. Kay and Kempton (1984) reported the first controlled experiment of this kind, comparing color similarity judgments across languages whose category boundaries differ. Categorical perception (CP) of color is the claim that two hues drawn from different lexical categories are discriminated faster or more accurately than two hues from the same category separated by the same perceptual distance. Gilbert, Regier, Kay, and Ivry (2006) reported a lateralized version of this effect: right-handed observers searching for an oddly colored target among distractors were about 24 ms faster when target and distractors fell in different color categories than when they fell in the same category, but only for targets in the right visual field (RVF) — the half of the visual field that projects to the left cerebral hemisphere, where the main language areas lie in most right-handers — suggesting that the language system itself contributes to the perceptual decision. Subsequent studies split: some reported the lateralized effect (Drivonikou et al., 2007; Roberson, Pak, & Hanley, 2008, testing Korean; Winawer et al., 2007, reported a related Russian "blue" category advantage disrupted by verbal interference), while others found no visual-field asymmetry.

Brown, Lindsey, and Guckes (2011) subjected this paradigm to stricter controls. In five experiments using button-press and eye-movement (saccadic) reaction times around the green-blue boundary, together with Maximum Likelihood Difference Scaling (MLDS, a psychophysical method that scales the perceived differences between stimuli without assuming any uniform color space) and an explicit null model based on the cone-opponent channels of early vision (the L-M and S-cone difference signals that follow the retina's three cone types), they found reliable reaction-time minima at a fixed position in color space (near 185 degrees of hue azimuth, the angular position of a color in the opponent plane of CIELAB, a standard approximately uniform color space) but no relationship between those minima and the lexical green-blue boundary, and no RVF-specific advantage of the size Gilbert et al. reported. A low-level model of sensory color discrimination accounted for the full reaction-time data without any categorical component. They concluded that colors "are apparently not categorized when they are perceived, at least not under the particular experimental conditions we examined", while explicitly declining to generalize to whether visual perception is ever categorical, and called for the green-blue reaction-time paradigm to be re-examined with explicit null hypotheses and adequate perceptual scaling. Their general discussion tallied the follow-up record of Gilbert et al. (2006): of seven psychophysical studies, four reported a significant RVF advantage and three reported none. The unresolved question is therefore not merely whether one experiment replicated, but whether language can, under any conditions, produce genuinely perceptual categorical effects — and if so, under which stimulus, task, timing, and neural conditions.

Problem Statement

Determine whether language-derived color categories modulate the perception of color itself — as distinct from low-level sensory differences, artifacts of unequal stimulus discriminability, and post-perceptual decision, memory, or response-bias processes — and under what conditions. Concretely: (i) establish whether the cross-category facilitation reported in rapid perceptual tasks, including the lateralized visual-search advantage at lexical color boundaries such as green-blue, sinij-goluboj (the Russian lexical contrast between dark and light blue), or other language-specific boundaries, is replicable when same- and cross-category stimuli are equated in a perceptual metric (just-noticeable differences, the smallest stimulus difference an observer can reliably detect, or Maximum-Likelihood-Difference-Scaling-derived units) and evaluated against explicit physiologically grounded null models of the kind introduced by Brown, Lindsey, and Guckes (2011); (ii) delimit the experimental regime — hue regions and lexical boundaries, stimulus contrast, chroma, and luminance, static versus dynamic stimuli, immediate versus delayed report, trained or newly learned lexical categories — in which such facilitation appears or disappears; and (iii) determine the processing locus and the neural and temporal conditions of any surviving effect, including whether it is lateralized to the right visual field (left hemisphere) as the language-mediated account predicts, is bilateral, or depends on task format and timing.

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