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Casteleti, D.A. Stimulus equivalence in children with Apert Syndrome. 2011. 82f. Thesis (Master)Instituto de Psicologia, Universidade de São Paulo, São Paulo. The present study investigated the symbolic behaviors of patients with Apert Syndrome through the paradigm of stimulus equivalence, since it may provide a basis for understanding complex human behavior, such as symbolic behavior and language. It had been proposed three experiments which participants, aged between 16 and 21 years, were submitted to Experiments 1 and 2 (P1, P2 and P3) and to Experiment 3 (P4 e P5). In Experiment 1, the objective was to assess the formation of classes of equivalent stimuli after training of conditional relations, through a task of matching to sample (MTS) and delay of 0s and three comparison stimuli. After the participant reaches a 94% criterion for accuracy in the block, tests were conducted for equivalence (CA), symmetry (BA and CB) and transitivity (AC). In general, the participants failed the tests, with relative preservation of the symmetry test. In Experiment 2, the participants were exposed to the task of MTS with delay of 0s and three comparison stimuli, but these and the sample stimulus were initially covered, becoming visible only after the observation responses (OR ́s) issuance. OR’s were introduced in the MTS task, with the objective to assess what kind of different controls (selection and rejection) could be involved in the formation of classes of equivalent stimuli. In tests, participant P3 showed the formation of classes of equivalent stimuli; however, participants P1 and P2 had failed to form equivalence, preserving the symmetry test. In Experiment 3 were presented methodological variations with the objective of encouraging the establishment of one or another type of control (selection or rejection) during the training of conditional relations and verify the effects of these variations in performance obtained in tests. Participant P4 was, at first, subjected to the situation which the third OR produced the correct stimulus in 80% of attempts (80% / 3rd S +). After the tasks under this condition were performed, P4 underwent a situation which the first OR produced the correct stimulus in 80% of attempts (80% / 1st S +). The participant P5 was exposed to the reverse order: first of all to the situation 80% / 1st S + and subsequently to the situation 80% / 3rd S +. In the tests, in both situations, the participant P4 was able to learn the equivalence 11 relations proposed by the experimenter. In contrast, the response of the participant P5 was not under discriminative control of the contingencies programmed by the experimenter. In general, the results obtained by this study plus the analysis of the PEABODY data suggests that difficulties in the formation of equivalence classes in participants with low language functioning may be due, in large part from inadequate preparation and adjustment procedures for this type of population.

Equivalência de estímulos em crianças portadoras da síndrome de apert