title: Figure and ground, methodology, and the spiral aftereffect.
mesh_terms: D000293:Adolescent; D000328:Adult; D003118:Color Perception; D005366:Figural Aftereffect; D005403:Fixation, Ocular; D005556:Form Perception; D006801:Humans; D007088:Illusions; D009039:Motion Perception; D012107:Research Design