Linton Stereo Illusion

TL;DR

The Linton Stereo Illusion demonstrates that perceived stereo depth is primarily influenced by retinal disparities rather than actual 3D spatial geometry, challenging traditional understanding of stereo vision.

Contribution

This paper introduces a new stereo illusion showing perceived depth aligns with retinal disparity, not physical 3D distance, offering insights into stereo perception mechanisms.

Findings

Observers perceive constant disparity as maintaining depth.

The illusion suggests retinal disparity dominates perceived stereo depth.

Challenges traditional models of 3D perception in stereo vision.

Abstract

We present a new illusion that challenges our understanding of stereo vision. The illusion consists of a larger circle at 50cm, and smaller circle in front of it at 40cm, with constant angular sizes throughout. We move the larger circle forward by 10cm (to 40cm) and then back again (to 50cm). The question is, what distance should we move the smaller circle forward and back to maintain a constant perceived separation in depth between the circles? Constant physical distance (10cm) or constant retinal disparity (6.7cm)? Observers choose constant disparity. We therefore argue the 'Linton Stereo Illusion' appears to suggest that perceived stereo depth reflects retinal disparities rather than 3D geometry.