Alpha-band oscillations reflect external spatial coding for tactile stimuli in sighted, but not in congenitally blind humans

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Details zur Publikation

Autorinnen und Autoren: Schubert JT, Buchholz VN, Föcker J, Engel AK, Röder B, Heed T
Zeitschrift: Scientific Reports
Jahr der Veröffentlichung: 2019
Band: 9
Heftnummer: 1
ISSN: 2045-2322


Abstract

We investigated the function of oscillatory alpha-band activity in the neural coding of spatial information during tactile processing. Sighted humans concurrently encode tactile location in skin-based and, after integration with posture, external spatial reference frames, whereas congenitally blind humans preferably use skin-based coding. Accordingly, lateralization of alpha-band activity in parietal regions during attentional orienting in expectance of tactile stimulation reflected external spatial coding in sighted, but skin-based coding in blind humans. Here, we asked whether alpha-band activity plays a similar role in spatial coding for tactile processing, that is, after the stimulus has been received. Sighted and congenitally blind participants were cued to attend to one hand in order to detect rare tactile deviant stimuli at this hand while ignoring tactile deviants at the other hand and tactile standard stimuli at both hands. The reference frames encoded by oscillatory activity during tactile processing were probed by adopting either an uncrossed or crossed hand posture. In sighted participants, attended relative to unattended standard stimuli suppressed the power in the alpha-band over ipsilateral centro-parietal and occipital cortex. Hand crossing attenuated this attentional modulation predominantly over ipsilateral posterior-parietal cortex. In contrast, although contralateral alpha-activity was enhanced for attended versus unattended stimuli in blind participants, no crossing effects were evident in the oscillatory activity of this group. These findings suggest that oscillatory alpha-band activity plays a pivotal role in the neural coding of external spatial information for touch.


Einrichtungen weiterer Autorinnen und Autoren

Universität Bielefeld
Universität Hamburg
Universitätsklinikum Hamburg-Eppendorf
University of Lincoln


Zitierweisen

APA:
Schubert, J.T., Buchholz, V.N., Föcker, J., Engel, A.K., Röder, B., & Heed, T. (2019). Alpha-band oscillations reflect external spatial coding for tactile stimuli in sighted, but not in congenitally blind humans. Scientific Reports, 9(1). https://dx.doi.org/10.1038/s41598-019-45634-w

MLA:
Schubert, Jonathan T.W., et al. "Alpha-band oscillations reflect external spatial coding for tactile stimuli in sighted, but not in congenitally blind humans." Scientific Reports 9.1 (2019).

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Zuletzt aktualisiert 2019-11-07 um 17:08