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Temporal Organization of "Internal Speech" As a Basis for Cerebellar Modulation of Cognitive Functions
University of Tuebingen
University of California The sequencing of smooth and rhythmically "sculptured" words and phrases at a speaker’s habitual speech rate (4 Hz to 6 Hz) critically depends on the cerebellum. Besides overt performance, the cerebellum also seems to organize the syllabic structure of "auditory verbal imagery" or "internal speech"—that is, a prearticulatory but otherwise fully elaborated and temporally organized representation of verbal utterances. As a consequence, cerebellar disorders may compromise cognitive operations that involve a speech code, such as verbal working memory, or disrupt cognitive processes that encompass linguistic mediation. Besides the temporal organization of syllable strings at a prearticulatory level, cerebellar patients are impaired in speech perception tasks requiring the encoding of durational parameters of the acoustic signal. The hemodynamic responses associated with these two aspects of verbal-acoustic communication— internal speech and speech perception—were found to be organized along the rostro-caudal direction within paravermal aspects of the superior right cerebellar hemisphere. Those areas of the right cerebellar hemisphere thus might provide a common platform for the computation of temporal aspects of verbal utterances in the domains of both speech production and perception.
Key Words: cerebellum • cognition • speech motor control • speech perception
Behavioral and Cognitive Neuroscience Reviews, Vol. 3, No. 1,
14-22 (2004) This article has been cited by other articles:
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