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Characteristics of motion parallax on the vertical plane at 0° azimuth. (a) Mean instantaneous retinal speed given by simulated point sources located within ±15° elevation and up to a distance of 3 m. (b) Minimum depth displacements resulting in speed differences of 1’/s for targets located at three different elevation angles: −15°, 0°, and 15°. Errorbars represent standard errors. Different panels show data for different observers.
