PSYC 303 Study Guide - Final Guide: Contour Line, Visual Masking, Interstimulus Interval
27 Dec 2013
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Document Summary
Contours: edges, sudden changes in light intensity across space. Shapes: regions of relatively uniform brightness in the visual system, separated from other shapes or background by contours. First order contour: region in the retinal image where light intensity changes abruptly. Emergent/second-order contours/subjective contours: appear to be contours but they are purely perceptual and made by the first-order contours that are present looks like triangle. The visual system wired more for first order contours (v1) Ganzfeld: a visual field used to illustrate that without contours we lose ability to see, a field containing no abrupt luminance changes (no contours). When looking into it it looks like a shapeless fog- colour fades to grey and won"t be seen even if picture is illuminated with coloured light. Some experience a blank out where they cannot see. Neural circuitry of brain exaggerates any edges.
