Abstract
Using FR approach and conflict chains and a light whose intensity increased or decreased within the FR as a function of responding, the present experiment found stimulus intensity to affect performance only when on-trial stimuli were discriminated from off-trial stimuli by permitting nonreinforced barpressing during the intertrial interval. These findings suggest a stimulus intensity, rather than a discriminative, origin of observed inequalities in the slopes of approach and avoidance gradients.
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