Whitfield, K E An analysis of task difficulty using the visually degraded stimulus task. [electronic resource] - Perceptual and motor skills Jun 1991 - 1047-57 p. digital Publication Type: Journal Article ISSN: 0031-5125 Standard No.: 10.2466/pms.1991.72.3.1047 doi Subjects--Topical Terms: AdolescentAdultAttentionDiscrimination LearningFemaleHumansMaleMental RecallMicrocomputersPattern Recognition, VisualSoftware