Reports two experiments which support the hypothesis that reaction time is faster to phonemes when the phonetic context matches the listener's expectation than when the vowel context is different. Reaction time to syllable targets is equal to phoneme, matched context targets. (PMJ)

Predictions were derived from the assumption that the vocabulary store underlying the auditory analysis of verbal stimuli is organized as an acoustic space rather than as a lexicon (tree) or collection. The relationship between frequency of occurrence in the language and frequency of occurrence as an error is low. (Author/SW)