Phonotactic illegality and probability in speech perception

Phonotactic knowledge is knowledge of the sound combinations of a language. Previous research showed that frequent sound combinations are perceived more easily than ill-formed ones, while illegal combinations are often filtered out or adapted. Phonotactics can be described in categorical terms (i.e., a sound combination is legal or illegal), or in gradient terms (i.e., a combination has a certain level of wellformedness). In addition, phonotactics can both be described in negative or positive terms, by defining when combinations are legal vs. when they are illegal. This thesis presents experimental research on the mental representation of phonotactics that is used for speech perception. A cross-modal priming experiment on second language listening showed that consonant clusters that are frequent in the second language are easier to process, in spite of perceptual epenthesis, an illusion caused by illegality of the same clusters in the first language.