Thomas, J P Inhibitory effect of less intense stimuli upon the increment threshold for a narrow test line. [electronic resource] - Vision research May 1968 - 537-42 p. digital Publication Type: Journal Article ISSN: 0042-6989 Standard No.: 10.1016/0042-6989(68)90094-1 doi Subjects--Topical Terms: HumansMethodsVision TestsVisual Perception