Experiments within the microgenetic paradigm provide an assessment of the role of stimulus structure and, inferentially, of cognitive structure on perception. Two experiments investigating the effect of redundancy (structure) in written language on visual perception are reported. Seven-letter arrays differing in percentage of redundancy were repeatedly exposed for brief durations. The arrays were unfamiliar to the subjects in experiment 1. The subjects had to memorize the list of stimuli in experiment 2. All subjects were instructed to report what they saw. Perceptual "reports" (Natsoulas, 1967) were obtained in experiment 2 only. A third experiment was run to check the results of experiment 2. Letter position was the overriding determiner of perceptibility, yielding an inverted U-shaped function about the fixation point. The increase in perceptibility as a function of stimulus structure was significant, but small. Information transmitted decreased markedly. The results are interpreted in relation to two models of information flow for the recognition and microgenesis tasks. References are listed (Author/BS)