La contribution de la stéréoscopie à la constance de forme
This study was conducted to evaluate the contribution of stereopsis to the shape constancy phenomenon. Four groups of eight participants each were asked to perform a visual exploration task. The first group was exposed to a stereoscopic stimulation, the second group was exposed to a reversed stereoscopic stimulation, the third group was exposed to a monocular stimulation with textures and shadow and the fourth group was exposed to a monocular stimulation with shadow only. Response times and error rates were used to measure participant's performance. Results show an interaction between rotation effects (familiar viewpoints vs. non-familiar viewpoints) and available depth cues (stereopsis, reversed stereopsis, textures and shadow, shadow only). The rotation cost was smaller in the group exposed to a reversed stereoscopic stimulation. These results are congruent with the use of tridimensional representations underlying visual processing.
Conjunction Linear non-separability Orientation invariance Depth cues