Three studies investigated how 24-month-olds and adults resolve temporary ambiguity in fluent speech when encountering prenominal adjectives potentially interpretable as nouns. Children were tested in a looking-while-listening procedure to monitor the time course of speech processing. In Experiment 1, the familiar and unfamiliar adjectives preceding familiar target nouns were accented or deaccented. Target word recognition was disrupted only when lexically ambiguous adjectives were accented like nouns. Experiment 2 measured the extent of interference experienced by children when interpreting prenominal words as nouns. In Experiment 3, adults used prosodic cues to identify the form class of adjective/noun homophones in string-identical sentences before the ambiguous words were fully spoken. Results show that children and adults use prosody in conjunction with lexical and distributional cues to 'listen through' prenominal adjectives, avoiding costly misinterpretation.
KeywordsLanguage development; Speech processing; Ambiguity resolution; Eye movements; Eye-tracking; On-line measures; Speed of processing; Adjectives; Prenominal adjectives; Form class; Prosody; Lexical development; Grammatical development Adults interpret spoken language incrementally, assigning structure to linguistic input continuously as the speech signal unfolds. Although the process of comprehension seems effortless to the fluent adult, incremental processing in fact leads inevitably and continuously to potential problems of ambiguity as the listener attempts to interpret the meaning of a spoken utterance. Because speech unfolds from moment to moment, it is frequently the case that a number of alternative interpretations are possible at a particular point in time, only one of which will be correct. In a sentence such as Susie fixed her back porch, there is ambiguity at multiple levels of linguistic structure at different time points. For example, halfway through the verb, fix-, the sentence could go on to describe how Susie either fixes or fixates something, and on hearing Susie fixed her back-, the listener might prematurely infer that Susie had consulted a chiropractor rather than a carpenter. For adults, the process of recognizing words and resolving temporary ambiguities in spoken language is remarkably fast and efficient, enabled by the use of predictive cues from multiple sources of information in the speech stream. Using extensive knowledge of language and the world, adults can typically rely on linguistic and contextual information to constrain the possibilities of interpretation, so that understanding happens accurately and effortlessly as the sentence unfolds (e.g.