This page is a brief guide to the stereoscopic depth manipulation used in Harris & Aguirre (2008a, 2008b). Stimuli were derived from original versions described by Nakayama et al. (1989), with stereoscopic depth achieved using red/green glasses.
Stereoscopic stimuli were created by hand in Adobe Photoshop. The stimuli (StripsBack.psd and StripsFront.psd) consist of 5 layers: a white background, a patterned noise background (50% opacity to appear gray), a layer of white stripes, and green and red noise pattern overlays to be placed over the white stripes. The percept of depth was achieved by shifting the distance between the red and green layers (9 min of ocular disparity for the StripsBack and 6 min of ocular disparity for StripsFront).
Stimulus faces were copied into a separate layer positioned below the white stripe layer and adjusted manually to ensure adequate visibility.
Links to the files are below (must be opened with Photoshop to retain layer information):
