|Sunday, May 30, 2010
|3:30 PM–4:20 PM
|Lone Star Ballroom Salon D (Grand Hyatt)
|Chair: William Ferreira Perez (Universidade de São Paulo)
|Go and No-Go Procedure With Compound Stimuli and the Emergence of Symmetry in the Pigeon
|Domain: Experimental Analysis
|HELOISA CURSI CAMPOS (Universidade de São Paulo), Paula Debert (University of Sao Paulo)
|Abstract: Go and no-go procedure with compound stimuli establishes emergent relations with humans. The present study aimed to evaluate whether the go and no-go procedure with compound stimuli would produce symmetry with pigeons as subjects. Three pigeons were submitted to successive discrimination with compound stimuli. Each compound stimulus was a circle bisected in two halves with different colors: red (A1), green (B1), blue (C1), yellow (A2), violet (B2) and orange (C2). Pecks on a touch screen when A1B1, A2B2, B1C1 or B2C2 were presented were intermittently followed by food. Pecks on the touch screen when A1B2, A2B1, B1C2 or B2C1 were presented were not followed by food. During symmetry test compound stimuli BA and CB were successively presented and responses were not followed by any programmed consequences. All pigeons responded only when B1A1, B2A2, C1B1 or C2B2 were presented and did not respond when B1A2, B2A1, C1B2 or C2B1 were presented. These results suggest the immediate emergence of symmetry and indicate that the go/no-go procedure with compound stimuli can be an alternative procedure to produce some of the emergent relations in nonhumans.
|Select and Reject Controls in Equivalence-Class Formation: A Critical Analysis on Methodological Issues
|Domain: Experimental Analysis
|WILLIAM FERREIRA PEREZ (Universidade de São Paulo), Gerson Yukio Tomanari (University of Sao Paulo)
|Abstract: Data in the literature have suggested that, in a matching-to-sample task, both select and reject controlling relations are important to establish complex stimulus control, such as generalized identity, oddity-from-sample, exclusion, and equivalence relations. Despite the relevance, not many studies have manipulated these controlling relations directly in order to verify their effects on equivalence class formation. Difficulties to experimentally isolate select and reject controls may account for it. In this paper, we will review and critically analyze parameters and procedures typically used to investigate select and reject controls in equivalence-class formation. With respect to parameters, we will discuss number of comparisons and response topography. With respect to procedures, we will evaluate the effects of presenting S+ and S- in different proportions, giving cues (delayed cue or delayed S+), and covering one of the comparisons (blank-comparison procedure). Although the manipulation of observing responses seems to be critical to bias both controls, failures to establish reject control may occur because observing responses toward the S- often is not required. To solve this problem, a procedure that controls for observing responses forcing or precluding participants to uncover S+ or S- will be proposed.