Neuroscience 2001 Abstract
| Presentation Number: | 119.8 |
|---|---|
| Abstract Title: | Cerebellar and cortical neuronal networks in speech perception: a functional magnetic resonance imaging study. |
| Authors: |
Mathiak, K.*1,2
; Hertrich, I.1
; Grodd, W.2
; Ackermann, H.1
1Dept Neurology, University of Tuebingen, Tuebingen, Germany 2Dept Neuroradiology, University of Tuebingen, Tuebingen, Germany |
| Primary Theme and Topics |
Cognition and Behavior - Human Cognition and Behavior -- Language |
| Secondary Theme and Topics | Sensory Systems<br />- Auditory<br />-- Localization |
| Session: |
119. Human cognition and behavior: language II Slide |
| Presentation Time: | Sunday, November 11, 2001 2:45 PM-3:00 PM |
| Location: | Room 1B |
| Keywords: | timing, phonemes, verbal memory, categorical perception |
In 1990, Keele and Ivry considered the cerebellum as to be an 'internal clock' supporting temporal computations, both, in the motor and in the perceptual domain. Durational parameters contribute to speech perception. A previous study (Ackermann et al., 1997) found bilateral cerebellar disorders to compromise the identification of lexical items exclusively differing in a durational measure, i.e., intersyllabic silent period (occlusion time). The same subjects, however, showed intact categorical distinctions for the voice onset time (VOT). To further delineate contribution of the cerebellum to speech perception, activation in response to two series of items were studied by means of functional magnetic resonance imaging (fMRI): Boten / Boden (engl.: messenger / floor) utterances exclusively differing in (a) the intersyllabic occlusion time (27-167ms) or (b) in the intrasyllabic VOT (9-69ms), respectively. Randomized blocks requiring identification of the intersyllabic time measure yielded significantly higher activation of the right lateral neocerebellum and left prefrontal inferior gyrus. Whereas, the intrasyllabic contrast, i.e., VOT detection, yielded activation at the level of the dominant hemispheric supratemporal plane. Contrasts to mono-syllables revealed distributed networks engaged in the categorization task which might be further delineated by other phonetic contrasts such as place of articulation (Boten / Goten). Contributions of a distributed network of cortical and subcortical structures might subserve dedicated functions during speech perception.
Supported by DFG: SFB 550/B1
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2001 Neuroscience Meeting Planner. San Diego, CA: Society for Neuroscience, 2001. Online.
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