EFFECT OF THE STIMULUS MAGNITUDE ON THE C ONFIDENCE OF PSYCHOPHYSICALJUDGMENTS

Effect of the stimulus magnitude on the confidence of psychophysical j udgments. Even though quantitative judgments are clearly affected by n on-sensory factors, the principal component of the response variance h as always being sensory magnitudes (Garriga-Trillo, 1992; Baird, in pr ess). Olsson & Winman (1996) have found that confidence judgments on d etection responses are affected by stimulus characteristics. Confidenc e judgments of quantitative responses have not been studied on this is sue. This work studies if the stimulus magnitude influences confidence judgments of quantitative psychophysical responses considering a line length estimation and a time duration task. Independent of the sensor y modality involved, mainly, there are no significant differences betw een the confidence distributions for each stimulus. Metajudgments of c onfidence in estimation tasks are not affected by stimulus magnitude. This could favor, within the two-process theory, the cognitive nature of confidence judgments.