Adjustment of an observer to a limited set of pictures in the course of an experiment.
D000293:Adolescent; D000328:Adult; D001288:Attention; D003463:Cues; D004193:Discrimination Learning; D005260:Female; D005556:Form Perception; D006801:Humans; D008297:Male; D008875:Middle Aged; D010364:Pattern Recognition, Visual; D010470:Perceptual Masking