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These results highlighted the importance of low-level auditory mechanisms on degraded speech restoration

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ESCOP 2005 : XIV Conference of the European Society for Cognitive Psychology. Leiden University, Leiden, The Netherlands 31st August - 3rd September 2005.Oral Communication

COGNITIVE RESTORATION OF DEGRADED SPEECH: IMPLICATION OF BOTH DESCENDING AUDITORY PATHWAYS AND LEXICAL STRATEGIES

In the present study we explored high and low-level mechanisms implicated in degraded speech comprehension in normal hearing subjects. We compared the loss of intelligibility due to the presence of increasing degraded (time-reversed) speech segments in words and pseudowords.

Results showed that words were better reconstructed than pseudowords, evidencing a lexical benefit for words in degraded speech restoration. We also observed an important interindividual variability only in pseudowords reconstruction performances. These behavioural performances correlated strongly with the subjects’ medial olivocochlear bundle (MOCB) functionality. These results highlighted the importance of low-level auditory mechanisms on degraded speech restoration. Concerning words reconstruction we found an effect of both the number of phonological neighbours and nouns frequency. These results confirm that lexical strategies were activated to compensate for the lack of information.

Overall these experiments suggest that high-level information -such as lexical ones- can to some extent compensate for poor functionality of the MOCB.

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