ABSTRACT
Lexical tones are a phonetic contrast necessary for conveying meaning in a majority
of the world's languages. Various hearing, speech, and language disorders affect the
ability to perceive or produce lexical tones, thereby seriously impairing individuals'
communicative abilities. The number of tone language speakers is increasing, even
in otherwise English-speaking nations, yet insufficient emphasis has been placed on
clinical assessment and rehabilitation of lexical tone disorders. The similarities
and dissimilarities between lexical tones and other speech sounds make a richer scientific
understanding of their physiological bases paramount to more effective remediation
of speech and language disorders in general. Here we discuss the cognitive and biological
bases of lexical tones, emphasizing the neural structures and networks that support
their acquisition, perception, and cognitive representation. We present emerging research
on lexical tone learning in the context of the clinical disorders of hearing, speech,
and language that this body of research will help to address.
KEYWORDS
Lexical tone - language learning - dysarthria - functional neuroimaging
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Patrick WongPh.D.
Communication Neural Systems Research Group, The Roxelyn and Richard Pepper Department
of Communication Sciences and Disorders, Northwestern University
2240 Campus Drive, Evanston, IL 60208
eMail: pwong@northwestern.edu