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  Inhibitory impact of subliminal electrical finger stimulation on SI representation and perceptual sensitivity of an adjacent finger

Taskin, B., Holtze, S., Krause, T., & Villringer, A. (2008). Inhibitory impact of subliminal electrical finger stimulation on SI representation and perceptual sensitivity of an adjacent finger. NeuroImage, 39(3), 1307-1313. doi:10.1016/j.neuroimage.2007.09.039.

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Taskin, B.1, Autor           
Holtze, Susanne1, Autor           
Krause, Tina, Autor
Villringer, Arno1, Autor           
Affiliations:
1External Organizations, ou_persistent22              

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Schlagwörter: fMRI; Human; Inhibition; Lateral interaction; Psychophysics; Somatosensory cortex
 Zusammenfassung: Simultaneous stimulation of two adjacent fingers above sensory perception threshold (supraliminal stimulation) leads to an inhibitory interaction effect on responses in primary somatosensory cortex (SI). Moreover, during electrical finger stimulation closely below threshold for conscious perception (subliminal stimulation) inhibitory interneurons in cortical layer 4 are assumed to be activated preferentially as compared to excitatory interneurons. Using fMRI in humans, here we show that interspersed subliminal electrical stimulation of an adjacent finger reduces the response to target finger stimulation in contralateral SI. This effect was shown in a complementary study to be associated behaviorally with a diminished detectability of test pulses on the target finger. We propose the mechanism underlying this lateral inhibitory effect to be related to a representational overlap of inhibitory interneurons in SI based on the divergence of thalamocortical feedforward projections, or to intracortical lateral inhibitory projections targeting juxtaposed receptive fields, or both.

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 Datum: 2008
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: eDoc: 511895
Anderer: P8990
DOI: 10.1016/j.neuroimage.2007.09.039
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Titel: NeuroImage
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Orlando, FL : Academic Press
Seiten: - Band / Heft: 39 (3) Artikelnummer: - Start- / Endseite: 1307 - 1313 Identifikator: ISSN: 1053-8119
CoNE: https://pure.mpg.de/cone/journals/resource/954922650166