Zur Stabilität der Neurotopographie von Vokalen: eine MEG-Studie
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Zusammenfassung
The extent to which spectral similarities as determined by a F1-F2 vowel space are represented in the neural correlates of vowels has been under examination in animal and human experimental research but not resolved yet. In the present study the N100m component of the auditory evoked field (AEF) was recorded with a 148-channel whole head magnetometer in 14 healthy control subjects in response to the German synthetic vowels [a], [e] and [i]. The study aimed at revealing functional principles of vowel representation in the supratemporal gyrus. The main hypothesis predicted that the mapping of [a], [e] and [i] onto the cortical surface reflects spectral dissimilarities according to the F1-F2 vowel space. Of additional interest was the reliability of the patterns found determined by repeatedly measuring all subjects. The N100m in response to [i] peaked latest while responses to [a] showed the weakest amplitude. Equivalent current dipole sources of [a] also showed the weakest dipole moment und were located more superior than the [e]-sources. This evidence supports the notion of distinguishable cortical responses to different vowel stimuli. Yet no stable pattern of dipole locations mainly in posterior-anterior direction could be obtained. Nevertheless euclidean distance ratio between dipole sources reflecting [a], [e] and [i] across both hemispheres and both sessions resembled physical F1-F2 -distances: [a]-[i] was larger compared to [e]-[i], p
Zusammenfassung in einer weiteren Sprache
Organisationsprinzipien der cortikalen Vokal-Repräsentation sind vielfach untersucht worden. Dabei konnten tier- und humanexperimentelle Studien Hinweise finden, dass sich in der cortikalen Antwort auf akustisch dargebotene Vokale spektrale Ähnlichkeitsbeziehungen der Formantenstruktur widerspiegeln.
In der vorliegenden Arbeit wurden für die synthetisierten Vokale [a], [e] und [i] mit einem 148-Kanal-Ganzkopfmagnetometer für N = 14 Versuchspersonen die Quellen der N100m-Komponente des Auditorisch Evozierten Feldes (AEF) lokalisiert. Es wurde versucht, eine phonemotope Repräsentation der Vokale aufzufinden und zu zeigen, inwiefern hierin die Ähnlichkeitsbeziehungen eines F1-F2-Vokalraums abgebildet werden. Zusätzlich sollte die gefundene Quellenkonfiguration in einer Wiederholungsmessung repliziert werden. Die [i]-N100m zeigte den signifikant spätesten, die [a]-N100m den signifikant schwächsten Gipfel. Die [a]-Quelle wies die schwächste Aktivierung auf und lag superior der [e]-Quelle. Insofern fand sich eine differentielle Hirnantwort auf die drei Vokale hin. Eine Stabilität ihrer cortikalen Repräsentationsorte konnte aber nicht nachgewiesen werden.
Jedoch bildeten die intraindividuellen euklidischen Distanzen der Vokal-Quellen in beiden Hemisphären die Distanzverhältnisse des F1-F2-Vokalraums ab ([a]-[i]> [e]-[i], p
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OBLESER, Jonas, 2001. Zur Stabilität der Neurotopographie von Vokalen: eine MEG-Studie [Master thesis]BibTex
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