Modulation of alpha oscillations is required for the suppression of semantic interference

Date

2017-10-01

Author

Melnik, Natalia
Mapelli, Igor
Özkurt, Tolga Esat

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Recent findings on alpha band oscillations suggest their important role in memory consolidation and suppression of external distractors such as environmental noise. However, less attention was given to the phenomenon of internal distracting information being solely inherent to the stimuli content. Human memory may be prone to internal distractions caused by semantic relatedness between the meaning of words (e.g., atom, neutron, nucleus, etc.) to be encoded, i.e., semantic interference. Our study investigates the brain oscillatory dynamics behind the semantic interference phenomenon, whose possible outcome is known as false memories. In this direction, Deese-Roediger-McDermott word lists were appropriated for a modified Sternberg paradigm in auditory modality. Participants received semantically related and unrelated word lists via headphones while EEG data were acquired. Semantic interference triggered the false memory rates to be higher than those of other types of memory errors. Analysis demonstrated that the upper part of alpha band (-10-12 Hz) power decreases on parieto-occipital channels in the retention interval, prior to the probe item for semantically related condition. Our study elucidates the oscillatory mechanisms behind semantic interference by relying on alpha functional inhibition theory.

Subject Keywords

Alpha activity, Attention, EEG, False memory, Neural oscillations, Semantic interference

URI

https://hdl.handle.net/11511/30139

Journal

NEUROBIOLOGY OF LEARNING AND MEMORY

DOI

https://doi.org/10.1016/j.nlm.2017.05.007

Collections

Graduate School of Informatics, Article

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Citation Formats

N. Melnik, I. Mapelli, and T. E. Özkurt, “Modulation of alpha oscillations is required for the suppression of semantic interference,” NEUROBIOLOGY OF LEARNING AND MEMORY, pp. 11–18, 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30139.