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This study presents three experiments that aimed to show the formation of stimulus equivalence relations among stimuli that had been previously related only by exclusion. In Experiment 1, participants were trained on baseline conditional discriminations to establish two 3-member equivalence classes. Then, they were exposed to exclusion trials, without feedback, in which undefined stimuli had to be matched by rejecting the defined baseline stimuli. Finally, participants responded to test trials evaluating the emergence of symmetry and transitivity among the undefined stimuli from the exclusion trials. For half of the participants, the stimuli related by exclusion were introduced as S- stimuli in the baseline trials, whereas for the other half they were not. Further, half of the participants were assessed for emergent relations with stimuli from all the classes, whereas the other half was assessed for emergent relations with only the stimuli related by exclusion. In Experiment 2, the S- comparisons in the emergent relations test trials with stimuli only related by exclusion were stimuli from a null class. In Experiment 3, the number of exclusion trials was doubled. Across experiments, most participants showed emergence of equivalence relations among the stimuli related by exclusion. Some conditions of stimulus control associated with exclusion learning and the emergence of equivalence relations are discussed.

El concepto de abstracción ha sido difundido en la literatura conceptual y experimental en el análisis de la conducta desde inicios del siglo XX. Su uso en las aproximaciones derivadas de la teoría del condicionamiento, predominantemente ha sido permeado por categorías de orden operacional, lo cual ha permitido que se considere de forma equivalente o análoga a los conceptos de categorización y formación de conceptos, y que se formulen taxonomías de niveles de abstracción con base en criterios morfológicos. En el presente escrito, se describen las características de dichos usos en la tradición del análisis de la conducta, se identifican algunas insuficiencias conceptuales en torno a su definición con base en categorías operacionales y morfológicas, y se propone como alternativa una definición del comportamiento abstracto y una taxonomía de niveles de complejidad de este comportamiento desde una perspectiva interconductual.

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