title: Is a unified model of contrast and constancy possible? Reply to Gilchrist.
authors.affiliation: 4 Profitou Ilia St., Drosia 14572, Greece. Electronic address: lydia.maniatis@gmail.com.
authors.forename: Lydia M
authors.initials: LM
authors.lastname: Maniatis
mesh_terms: D006801:Humans; D008027:Light; D011582:Psychological Theory; D014796:Visual Perception