dc.contributor.advisor | Antal, Andrea Prof. Dr. | de |
dc.contributor.author | Ambrus, Géza Gergely | de |
dc.date.accessioned | 2013-01-14T15:07:03Z | de |
dc.date.available | 2013-01-30T23:50:52Z | de |
dc.date.issued | 2012-08-02 | de |
dc.identifier.uri | http://hdl.handle.net/11858/00-1735-0000-000D-EF6F-7 | de |
dc.description.abstract | Transkranielle Stromstimulation mit
geringen Intensitäten (tES) bietet nicht nur die Möglichkeit der
klinischen Intervention bei neurologischen Erkrankungen, sondern
ist auch ein leistungsfähiges Forschungswerkzeug, um die
Funktionsweise des gesunden menschlichen Gehirns besser verstehen
zu können. Die erste Studie, die in der Arbeit dargestellt ist,
zeigt, dass eine tES des dorsolateralen prefrontalen Kortex die
Kategorisierungsleistung in der „A, not A“ Version des
Prototypendistorsionstest beeinflussen kann. Diese Ergebnisse
zeigen ein Verschwinden des Prototypeneffekts, wenn dieses
Hirnareal mit anodaler transkranieller Gleichstromstimulation
(tDCS) und transkranieller Zufallsrauschstimulation (tRNS)
stimuliert wird. Die | de |
dc.format.mimetype | application/pdf | de |
dc.language.iso | eng | de |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/ | de |
dc.title | Low Intensity Transcranial Electrical Stimulation: Effects on Categorization and Methodological Aspects | de |
dc.type | doctoralThesis | de |
dc.title.translated | Transkranielle Stromstimulation mit geringen Intensitäten: Die Effekte auf Kategorisierungsleistung und methodische Aspekte | de |
dc.contributor.referee | Antal, Andrea Prof. Dr. | de |
dc.date.examination | 2012-05-21 | de |
dc.subject.dnb | 610 Medizin, Gesundheit | de |
dc.subject.gok | MED 275 | de |
dc.subject.gok | FAB 440 | de |
dc.subject.gok | FA 080 | de |
dc.description.abstracteng | Low intensity transcranial electrical
stimulation (tES) not only offers the possibility of clinical
intervention in neurological disorders and conditions, but also
provides us with a powerful research tool for understanding the
workings of the intact human brain. The first study presented in
the thesis offers evidence that applying tES stimulation to the
dorsolateral prefrontal cortex can influence categorization
performance in the “A, not A“ version of the prototype distortion
test; the results show a disappearance of the prototype effect when
this area is stimulated using anodal transcranial direct current
stimulation (tDCS) and transcranial random noise stimulation
(tRNS). The similarity between the effects of tRNS and anodal tDCS
further supports tRNS as a promising method in research and
clinical applications. To assess the procedural sensations and
discomfort associated with tES we have quantified the cutaneous
perception characteristics of both tDCS and tRNS for short duration
stimulations at different intensities, and have found that the
application of tRNS involves substantially less procedural
discomfort. This finding suggests that when cutaneous perception is
an issue (e.g. blinding) tRNS may be better suited for certain
purposes. We have also tested the cutaneous perception
characteristics of tDCS and tRNS using round and rectangular
electrodes to test whether the application of round electrodes
reduces the procedural sensations associated with the stimulation.
We have found that the round electrode configuration did not have
an advantage in that regard. The time-course of the procedural
discomfort associated with tDCS and the Fade in – Short stimulation
– Fade out (FiSsFo) sham stimulation method has been investigated
in a third methodological study. We have found that investigators
(participants of the study who were conducting experiments using
tES methods themselves) could more easily distinguish between verum
and sham stimulation than naïve and experienced subjects.
Furthermore, we have found that the cutaneous perception does not
disappear in the first phase of the stimulation as previously
reported, but never quantitatively assessed. Nevertheless, when
taking only naïve and experienced participants into account, no
differences in the levels of perceived stimulation strength could
be observed, thus the FiSsFo method may be considered a reliable
approach to blinding in tDCS research. | de |
dc.contributor.coReferee | Mattler, Uwe Prof. Dr. | de |
dc.contributor.thirdReferee | Waldmann, Michael Prof. Dr. | de |
dc.subject.topic | Biology (incl. Psychology) | de |
dc.subject.ger | dorsolateralen prefrontalen Kortex | de |
dc.subject.ger | Prototypendistorsionstest | de |
dc.subject.ger | transkranieller Gleichstromstimulation (tDCS) | de |
dc.subject.ger | transkranieller Zufallsrauschstimulation (tRNS) | de |
dc.subject.ger | Placebo | de |
dc.subject.eng | dorsolateral prefrontal cortex | de |
dc.subject.eng | prototype distortion task | de |
dc.subject.eng | transcranial direct current stimulation | de |
dc.subject.eng | transcranial random noise stimulation | de |
dc.subject.eng | placebo | de |
dc.subject.bk | 44.03 Methoden und Techniken der Medizin | de |
dc.subject.bk | 77.03 Methoden und Techniken der Psychologie | de |
dc.subject.bk | 77.05 Experimentelle Psychologie | de |
dc.identifier.urn | urn:nbn:de:gbv:7-webdoc-3647-3 | de |
dc.identifier.purl | webdoc-3647 | de |
dc.affiliation.institute | Biologische Fakultät | de |
dc.identifier.ppn | 730348199 | de |