Progress in reading instruction depends to a great extent on perception and cognition. Perception depends upon the performance of sensory organs, quality of the circumstances attendant to the act of perception and the attitudes and predisposition of the perceiver which affect the quality of his perceptual performance.
Warner, D. (1968). Lingual Deviation, Visual Perception, and reading Achievement. Reading Horizons, 9 (1). Retrieved from http://scholarworks.wmich.edu/reading_horizons/vol9/iss1/2