Abstract
In order to investigate whether simultaneous or successive presentation of stimuli is related to the duration of eye fixation (i.e., the time spent gazing a specific stimulus), this study described the eye movements of young adults in simultaneous and successive simple discrimination tasks. Using 12 landscape scenes as visual stimuli, three participants were exposed to a simple discrimination training with simultaneously presented stimuli (Si Procedure) and then to a second simple discrimination training with successively presented stimuli (Su Procedure). Another three participants were exposed to the Procedure in the opposite order. In both cases, the learning criterion was that at least 90% of the responses should be correct in one block. Eye movements were recorded during the whole experiment. Participants achieved the learning criteria in both procedures. Beyond that, eye fixation time in the Su Procedure was higher than in the Si Procedure, regardless of the training sequence. Taken together with previous results in different experiments, our findings suggest that the duration of eye fixation plays a central role in the establishment of different stimulus control topographies.
Highlights
Resumo Com o objetivo de investigar se a apresentação simultânea ou sucessiva de estímulos estaria relacionada com a duração da fixação do olhar (i.e., o tempo gasto fixando um estímulo específico), este estudo descreveu os movimentos dos olhos de adultos em tarefas de discriminação simples simultâneas e sucessivas
Responding under discriminative control is verified when the subject emits a greater number of pecks at the moment when the triangle is presented, and fewer pecks at the moment when the circle is presented. In both procedures previously described, the triangle had the discriminative function of a positive stimulus (S+, the stimulus related to the reinforcer), and the circle had the discriminative function of a negative stimulus (S, the stimulus not related to the reinforcer)
The present experiment evaluated whether the form of stimulus presentation in simple discrimination trainings modulates the time spent observing stimuli
Summary
Resumo Com o objetivo de investigar se a apresentação simultânea ou sucessiva de estímulos estaria relacionada com a duração da fixação do olhar (i.e., o tempo gasto fixando um estímulo específico), este estudo descreveu os movimentos dos olhos de adultos em tarefas de discriminação simples simultâneas e sucessivas. A simple successive discrimination procedure can be performed with the use of an experimental chamber with only one response key and two visual stimuli. In this procedure, the stimuli are presented in the same key, but at alternating moments. The stimuli are presented in the same key, but at alternating moments In this second situation, pecking the key when the triangle is presented produces a reinforcer, whereas pecking the same key when the circle is presented is followed by conventional consequences for errors. Responding under discriminative control is verified when the subject emits a greater number of pecks at the moment when the triangle is presented, and fewer pecks at the moment when the circle is presented. In both procedures previously described, the triangle had the discriminative function of a positive stimulus (S+, the stimulus related to the reinforcer), and the circle had the discriminative function of a negative stimulus (S–, the stimulus not related to the reinforcer)
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