Elektrodermale Aktivität und lexikalische Verarbeitung bei Aphasie

It has been previously shown that patients with cognitive impairment due to circumscribed cerebral lesions can autonomically distinguish information which they cannot when asked to give conscious verbal response. Electrodermal reaction is one of the most reliable parameters to show autonomic nervous system activity. We studied the autonomic reaction to auditory verbal stimuli in a group of 15 aphasic patients and a control group of 16 healthy subjects. Presented stimuli were single words and pseudowords as targets and distractors in a lexical decision task requiring selective attention. We wondered whether access to the phonological input lexicon was still available in all clinical conditions of aphasia. All participants (aphasic patients and normal subjects) discriminated well between targets and distractors autonomically, as revealed by their electrodermal reaction to the stimuli. A subgroup of patients had difficulties to distinguish words and pseudowords overtly. This correlated to their low performance in auditory verbal comprehension as assessed by the Aachen Aphasia Test (AAT). Despite their low overt performance these patients did neither differ from the other aphasic patients nor from normal subjects in amplitude of specific electrodermal reaction. All groups showed significantly higher amplitudes to targets than to distractors. We hypothesize that the phonological input lexicon is still active though conscious access is impaired.

Grantor dc:publisher

Publikationsserver der RWTH Aachen University

Year dc:date

2001

Author dc:creator

• Rösing, Benjamin

Contributors dc:contributor

• Huber, Walter

• info:eu-repo/classification/ddc/610
• Medizin

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

ger

Identifier

https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-119126%22

OAI identifier oai:identifier

oai:publications.rwth-aachen.de:57056