Cite as:
Lillo J, Pestaña N G, Moreira H, Davies I R, 2001, "Surface colours, basic categories, and the Bezold - Brücke effect" Perception 30 ECVP Abstract Supplement

Surface colours, basic categories, and the Bezold - Brücke effect

J Lillo, N G Pestaña, H Moreira, I R Davies

The presence of a Bezold - Brücke (B - B) effect can be concluded when different hues are perceived in response to equivalent dominant-wavelength stimuli but appear quantitatively different. The results obtained in a monolexemic naming task showed that the perceptual importance of the B - B effect is bigger than commonly assumed and that this effect can be considered essential to understand the perception of hue and the use of basic chromatic categories. To exhaustively evaluate the influence of quantitative variables on hue perception, the full set of 1795 tiles contained in the NCS colour atlas was twice presented to nine observers, who had to use one of the eleven Spanish basic categories to name each one. The 1623 tiles that produced consistent responses allowed us to determinate the photo-colorimetric characteristics of the Spanish basic colour categories. Our results agree with what Boynton and Olson observed for English speakers twenty years ago. On the other hand, the use of the NCS Atlas instead of OSA made possible a better colorimetric specification of achromatic categories. The 1305 tiles consistently named with chromatic categories allowed us to observe important B - B effects, especially for a specific range of dominant wavelengths. More concretely, denominations of tiles with dominant wavelengths between 566 nm (H^*=96.4) and 523 nm (H^*=328) were very much influenced by reflectance.

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