La hipótesis que establece que el sistema ajusta sus descripáones a una transformación lineal de las propiedades que resultan del análisis perceptivo no está justificada y es evidente que la formación de categorías o conceptos es posible, aun tratando con categorías que no aceptan un modelo monotónico de representación. En esta investigación se analizan en dos experimentos las estrategias que permiten describir un cierto dominio de conocimiento en términos de un sistema binario de categorías difusas o bien definidas. Las descripciones que los sujetos efectúan suponen la formación de un sistema no monotónico de reglas de inferencia que permite distribuir los estímulos en clases complementarias, según contribuyan al proceso de decisión. Esta distribución no lineal de los estímulos en términos de las alternativas de respuesta es la que determina frente a los modelos de categorización propuestos hasta la fecha del proceso de categorización.
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