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Description: Human perception operates in a probabilistic manner, meaning it is not a fixed point but rather a distribution when encountering physical contexts. Recent studies in human behavior have increasingly considered this aspect, measuring both perception and post-perception behavior concurrently. The size estimation task with Visual Analogue Scale (VAS) is a valuable tool for tracking small perceptual changes over time. However, it remains unclear how much of the perceptual response measured by the VAS reflects true perceptual errors versus measurement errors inherent to the scale itself. In this research, we investigate the consistency of perceptual responses using the VAS and a size reproduction task to determine if humans exhibit similar perceptual errors across different perceptual tasks for the same physical stimulus.