ERP evidence for hemispheric asymmetries in exemplar-specific explicit memory access

Abstract The right cerebral hemisphere (RH) appears to be more effective in representing visual objects as distinct exemplars than the left hemisphere (LH) which is presumably biased towards coding objects at the level of abstract prototypes. As of yet, relatively little is known about the role that...

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Bibliographic Details
Published in:Brain research 2015-11, Vol.1625, p.73-83
Main Authors: Küper, Kristina, Zimmer, Hubert D
Format: Article
Language:English
Subjects:
Adolescent
Adult
Electroencephalography
Evoked Potentials - physiology
Exemplar-specificity
Female
FN400
Functional Laterality - physiology
Hemispheric asymmetry
Humans
Laterality effects
LPC
Male
Memory - physiology
Neurology
Photic Stimulation
Reaction Time - physiology
Recognition memory
Visual Fields - physiology
Visual Perception - physiology
Young Adult
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Summary:Abstract The right cerebral hemisphere (RH) appears to be more effective in representing visual objects as distinct exemplars than the left hemisphere (LH) which is presumably biased towards coding objects at the level of abstract prototypes. As of yet, relatively little is known about the role that asymmetries in exemplar-specificity play at the level of explicit memory retrieval. In the present study, we addressed this issue by examining hemispheric asymmetries in the putative event-related potential (ERP) correlates of familiarity (FN400) and recollection (LPC). In an incidental study phase, pictures of familiar objects were presented centrally. At test, participants performed a memory inclusion task on identical repetitions and different exemplars of study items as well as new items which were presented in only one visual hemifield using the divided visual field technique. With respect to familiarity, we observed exemplar-specific FN400 old/new effects that were more pronounced for identical repetitions than different exemplars, irrespective of the hemisphere governing initial stimulus processing. In contrast, LPC old/new effects were subject to some hemispheric asymmetries indicating that exemplar-specific recollection was more extensive in the RH than in the LH. This further corroborates the idea that hemispheric asymmetries should not be generalized but need to be distinguished not only in different domains but also at different levels of processing.
ISSN:0006-8993
1872-6240
DOI:10.1016/j.brainres.2015.08.004