Distinct neural sources underlying visual word form processing as revealed by steady state visual evoked potentials (SSVEP)
Autor: | Anthony M. Norcia, C. Benjamin Strauber, Quynh Nguyen, Vladimir Y. Vildavski, Blair Kaneshiro, Alexandra Yakovleva, Bruce D. McCandliss, Lindsey Hasak, Fang Wang |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Adult
Male Steady state (electronics) Adolescent Computer science Speech recognition Science Visual evoked potentials Electroencephalography Article medicine Humans Psychology Visual Word Evoked potential Latency (engineering) Form processing Multidisciplinary medicine.diagnostic_test Middle Aged Temporal Lobe Reading Word recognition Visual Perception Evoked Potentials Visual Medicine Female Neuroscience |
Zdroj: | Scientific Reports, Vol 11, Iss 1, Pp 1-15 (2021) Scientific Reports |
ISSN: | 2045-2322 |
Popis: | EEG has been central to investigations of the time course of various neural functions underpinning visual word recognition. Recently the steady-state visual evoked potential (SSVEP) paradigm has been increasingly adopted for word recognition studies due to its high signal-to-noise ratio. Such studies, however, have been typically framed around a single source in the left ventral occipitotemporal cortex (vOT). Here, we combine SSVEP recorded from 16 adult native English speakers with a data-driven spatial filtering approach—Reliable Components Analysis (RCA)—to elucidate distinct functional sources with overlapping yet separable time courses and topographies that emerge when contrasting words with pseudofont visual controls. The first component topography was maximal over left vOT regions with a shorter latency (approximately 180 ms). A second component was maximal over more dorsal parietal regions with a longer latency (approximately 260 ms). Both components consistently emerged across a range of parameter manipulations including changes in the spatial overlap between successive stimuli, and changes in both base and deviation frequency. We then contrasted word-in-nonword and word-in-pseudoword to test the hierarchical processing mechanisms underlying visual word recognition. Results suggest that these hierarchical contrasts fail to evoke a unitary component that might be reasonably associated with lexical access. |
Databáze: | OpenAIRE |
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