Neural plasticity associated with recently versus often heard objects

NeuroImage
Nathalie M-P BourquinStephanie Clarke

Abstract

In natural settings the same sound source is often heard repeatedly, with variations in spectro-temporal and spatial characteristics. We investigated how such repetitions influence sound representations and in particular how auditory cortices keep track of recently vs. often heard objects. A set of 40 environmental sounds was presented twice, i.e. as prime and as repeat, while subjects categorized the corresponding sound sources as living vs. non-living. Electrical neuroimaging analyses were applied to auditory evoked potentials (AEPs) comparing primes vs. repeats (effect of presentation) and the four experimental sections. Dynamic analysis of distributed source estimations revealed i) a significant main effect of presentation within the left temporal convexity at 164-215 ms post-stimulus onset; and ii) a significant main effect of section in the right temporo-parietal junction at 166-213 ms. A 3-way repeated measures ANOVA (hemisphere×presentation×section) applied to neural activity of the above clusters during the common time window confirmed the specificity of the left hemisphere for the effect of presentation, but not that of the right hemisphere for the effect of section. In conclusion, spatio-temporal dynamics of neural a...Continue Reading

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Citations

Oct 16, 2012·Brain Topography·Nathalie M-P BourquinStephanie Clarke
Jan 30, 2013·NeuroImage·Nathalie M-P BourquinStephanie Clarke
Mar 26, 2015·Stroke; a Journal of Cerebral Circulation·Stephanie ClarkeSonia Crottaz-Herbette

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