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The relationship between verbal and nonverbal auditory signal processing in conduction aphasia: behavioral and anatomical evidence for common decoding mechanisms

  • The processing of nonverbal auditory stimuli has not yet been sufficiently investigated in patients with aphasia. On the basis of a duration discrimination task, we examined whether patients with left-sided cerebrovascular lesions were able to perceive time differences in the scale of approximately 150ms. Further linguistic and memory-related tasks were used to characterize more exactly the relationships in the performances between auditory nonverbal task and selective linguistic or mnemonic disturbances. All examined conduction aphasics showed increased thresholds in the duration discrimination task. The low thresholds on this task were in a strong correlative relation to the reduced performances in repetition and working memory task. This was interpreted as an indication of a pronounced disturbance in integrating auditory verbal information into a long-term window (sampling disturbance) resulting in an additional load of working memory. In order to determine the lesion topography of patients with sampling disturbances, theThe processing of nonverbal auditory stimuli has not yet been sufficiently investigated in patients with aphasia. On the basis of a duration discrimination task, we examined whether patients with left-sided cerebrovascular lesions were able to perceive time differences in the scale of approximately 150ms. Further linguistic and memory-related tasks were used to characterize more exactly the relationships in the performances between auditory nonverbal task and selective linguistic or mnemonic disturbances. All examined conduction aphasics showed increased thresholds in the duration discrimination task. The low thresholds on this task were in a strong correlative relation to the reduced performances in repetition and working memory task. This was interpreted as an indication of a pronounced disturbance in integrating auditory verbal information into a long-term window (sampling disturbance) resulting in an additional load of working memory. In order to determine the lesion topography of patients with sampling disturbances, the anatomical and psychophysical data were correlated on the basis of a voxelwise statistical approach. It was found that tissue damage extending through the insula, the posterior superior temporal gyrus, and the supramarginal gyrus causes impairments in sequencing of time-sensitive information.show moreshow less

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Metadaten
Author:Kyriakos Sidiropoulos, Ria De BleserGND, Irene Ablinger, Hermann Ackermann
DOI:https://doi.org/10.1080/13554794.2014.902471
ISSN:1355-4794 (print)
ISSN:1465-3656 (online)
Pubmed Id:http://www.ncbi.nlm.nih.gov/pubmed?term=24679121
Parent Title (English):Neurocase : the neural basis of cognition
Publisher:Routledge, Taylor & Francis Group
Place of publication:Abingdon
Document Type:Article
Language:English
Year of first Publication:2015
Year of Completion:2015
Release Date:2017/03/27
Tag:brain lesions; conduction aphasia; lesion studies; processing of auditory nonverbal stimuli; speech pathology; speech perception
Volume:21
Issue:3
Pagenumber:17
First Page:377
Last Page:393
Organizational units:Humanwissenschaftliche Fakultät / Strukturbereich Kognitionswissenschaften
Peer Review:Referiert
Institution name at the time of publication:Humanwissenschaftliche Fakultät / Exzellenzbereich Kognitionswissenschaften