Edelman (1992: 69):
Brains contain multiple maps interacting without any supervisors, yet bring unity and cohesiveness to perceptual scenes. And they let their possessors (pigeons, for example) categorise as similar a large if not endless set of diverse objects, such as pictures of different fish, after seeing only a few such pictures.
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From the perspective of Systemic Functional Linguistic theory, perceptual categorisation is the construal of experience as perceptual meaning. This is a somatic, rather than social, semiotic system. In social species, perceptual meanings are further correlated with those of a social semiotic system, which in the case of humans, includes those of language, and what an individual "sees" depends on such correlations.
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