The 'response shift'.
D002540:Cerebral Cortex / Q000502:physiology; D003214:Conditioning, Classical; D004172:Diplopia; D005260:Female; D005403:Fixation, Ocular; D006801:Humans; D008266:Macula Lutea; D008297:Male; D012160:Retina / Q000502:physiology; D011984:Sensory Receptor Cells; D013285:Strabismus; D014785:Vision, Ocular / Q000502:physiology*; D014793:Visual Cortex; D014796:Visual Perception