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Several experiments that employed matching-to-sample procedure indicated the establishment of stimuli position control. Zentall and Hogan (1975) used an alternative procedure with which responses were emitted or not in a single-key (go/no-go procedure). In this procedure, the response key was longitudinally sectioned, so each half of the key could be lighted independently by the same or by two different colors. Results indicated that pigeon’s responses were under identity control in tests with new colors. Carter and Werner (1978) argued that the pigeon’s responses might have been controlled by an homogeneous field and not by the relation between the two colors presented in the two halves. So, pigeons’ performance would suggest simple discriminative control and not conditional control that is necessary to attest identity control. The purpose of this research was to evaluate if the procedure employed by Zentall and Hogan (1975) would produce simple or conditional control. Three pigeons were submitted to the same procedure reported by Zentall and Hogan (1975), but the two halves of the key were spatially separated in a way that no homogeneous field could be detected. All pigeons did not show discriminative performances in tests with new colors. When new training sessions were conducted with the two halves not spatially separated, the three pigeons showed discriminative performances in tests with new colors. These results indicate that Zentall and Hogan (1975)’ procedure probably generates simple discriminative performances and not identity control as suggested by Carter and Werner (1978).

Procedimento go/no-go e controle por identidade em pombos (Columba Livia)