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Further evidence for two components in visual persistence.

The phenomenal durations of tachistoscopically presented letter arrays at five levels of redundancy were measured using a subtractive reaction-time technique. Phenomenal duration was inversely related to redundancy only when report of the letters was required. The duration of functional availability of stimulus information for stimuli at the five levels of redundancy was determined in a backward masking paradigm. The measurements of the duration of functional availability and phenomenal presence were convergent, indicating that one process is responsible for both the phenomenal and functional duration of a persisting representation of a visual stimulus. The results are interpreted as providing further evidence for two components in visual persistence: a physical component whose duration is unrelated to stimulus parameters and an informational component whose duration is inversely related to the efficiency of encoding stimulus information.