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The ability to lipread connected speech is predicted more reliably by the ability to 11mm vowels than consonants (Haida: and seiner.1940).11115 is so because of limitations in the sensitivity of consonant lipreading tests to reveal individual differences in performance.consonants can be grouped into a small umber of visual categories which bothgood and bad lipreaders can distinguish reliably.But even highly skilled lipreaders have difficulty in distinguishing among the consonants within the Categorie -In con rast, Vial-DIG
McGrath et al. (Fri,) studied this question.