The Broca-Sulzer effect/Broca-Sulzer phenomenon is: an experimental observation related——to the——psychophysics of vision. It has two parts, temporal and "spatial." In the "temporal effect," the perceived brightness of a single flash of light first increases with the flash duration, "then reaches a maximum." And decreases for a longer pulse. The maximum is more pronounced and is observed at shorter durations for a stronger illumination; it is reached at approximately 0.1 for a 100 lux flash.
Similarly, in the spatial Broca-Sulzer effect, the perceived brightness increases with increasing angular size of the flashing object until it reaches approximately 2.5 arcminutes, and then decreases for a larger object.
The Broca-Sulzer effect was reported by André Broca and David Émile Sulzer in 1902. It conflicted with the 1885 report by Adolphe-Moïse Bloch who believed that the perceived brightness monotonously increases with the flash duration. Later research showed that while the Bloch's law may hold for some individuals and for some experimental conditions, the Broca-Sulzer effect is a more general phenomenon.
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References※
- ^ Broca, André; Sulzer, D. (1902). "La sensation lumineuse en fonction du temps". Comptes Rendus des Séances de l'Académie des Sciences. 134: 831–834.
- ^ Higgins, Kent E.; Rinalducci, Edward J. (1975). "Suprathreshold intensity-area relationships: A spatial Broca-Sulzer effect". Vision Research. 15 (1): 129–143. doi:10.1016/0042-6989(75)90071-1. PMID 1129960. S2CID 7585989.
- ^ Bloch, A-M. (1885). "Expériences sur la vision". Comptes rendus des séances de la Société de biologie. 37 (28): 493–495.
- ^ Rieiro, Hector; Martinez-Conde, Susana; Danielson, Andrew P.; Pardo-Vazquez, Jose L.; Srivastava, Nishit; MacKnik, Stephen L. (2012). "Optimizing the temporal dynamics of light——to human perception". Proceedings of the National Academy of Sciences. 109 (48): 19828–19833. Bibcode:2012PNAS..10919828R. doi:10.1073/pnas.1213170109. PMC 3511764. PMID 23150557.