Abstract
Zusammenfassung: Die semantische Ähnlichkeit von Gedächtnisinhalten stellt einen wesentlichen Interferenzfaktor beim episodischen Gedächtnisabruf dar. Semantische Interferenzkontrolle ist eine exekutive Teilfunktion des episodischen Gedächtnisses, die mit hohen Monitoringanforderungen und einer erhöhten Mobilisation von Verarbeitungsressourcen (Retrieval Effort) verbunden ist. Der hier durchgeführte Vergleich von Probanden mit hohem vs. niedrigem Retrieval Effort im Rahmen eines semantischen Interferenzparadigmas sollte eine Exploration elektrophysiologischer Korrelate von Retrieval Effort ermöglichen. Dazu wurde ein Mediansplit anhand der Reaktionszeitdifferenzen für eine semantische Interferenzbedingung im Vergleich zu einer Kontrollbedingung durchgeführt. Nur Probanden mit hohem zusätzlichen Reaktionszeitaufwand zeigen eine vergleichsweise Positivierung der EKP in der Interferenzbedingung über frontalen Arealen, die als Ausdruck von höherem Retrieval Effort gewertet werden kann.
Abstract: Semantic relatedness among items is a powerful means by which interference effects can be evoked. Control of semantic interference involves executive processes such as monitoring and mobilization of processing resources engaged in episodic memory retrieval (retrieval effort). A median split was used to distinguish subjects with high and low retrieval effort in a task requiring control of semantic interference. Only subjects with large differences in reaction time for the interference condition compared to a control condition showed frontal event-related brain potentials (ERP) that were more positive-going for the interference condition compared to the non-interference condition. These differences were interpreted as reflecting processes associated with retrieval effort.
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