A perceptual numerosity judgment task using interleaved staircase procedures to estimate thresholds.

Psychometric study of the classic Muller-Lyer illusion using an adaptive staircase to find the point of subjective equality.

A time estimation task from the UTC test battery (Jerison et al., 1957). A square target descends at constant speed, becomes occluded behind a wall, and participants estimate when it would reach a notch at the bottom. Tests temporal perception and mental extrapolation.