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Main Title: Distributed functions of detection and discrimination of vibrotactile stimuli in the hierarchical human somatosensory system
Author(s): Kim, Junsuk
Müller, Klaus-Robert
Chung, Yoon Gi
Chung, Soon-Cheol
Park, Jang-Yeon
Bülthoff, Heinrich H.
Kim, Sung-Phil
Type: Article
Language Code: en
Abstract: According to the hierarchical view of human somatosensory network, somatic sensory information is relayed from the thalamus to primary somatosensory cortex (S1), and then distributed to adjacent cortical regions to perform further perceptual and cognitive functions. Although a number of neuroimaging studies have examined neuronal activity correlated with tactile stimuli, comparatively less attention has been devoted toward understanding how vibrotactile stimulus information is processed in the hierarchical somatosensory cortical network. To explore the hierarchical perspective of tactile information processing, we studied two cases: (a) discrimination between the locations of finger stimulation; and (b) detection of stimulation against no stimulation on individual fingers, using both standard general linear model (GLM) and searchlight multi-voxel pattern analysis (MVPA) techniques. These two cases were studied on the same data set resulting from a passive vibrotactile stimulation experiment. Our results showed that vibrotactile stimulus locations on fingers could be discriminated from measurements of human functional magnetic resonance imaging (fMRI). In particular, it was in case (a) we observed activity in contralateral posterior parietal cortex (PPC) and supramarginal gyrus (SMG) but not in S1, while in case; (b) we found significant cortical activations in S1 but not in PPC and SMG. These discrepant observations suggest the functional specialization with regard to vibrotactile stimulus locations, especially, the hierarchical information processing in the human somatosensory cortical areas. Our findings moreover support the general understanding that S1 is the main sensory receptive area for the sense of touch, and adjacent cortical regions (i.e., PPC and SMG) are in charge of a higher level of processing and may thus contribute most for the successful classification between stimulated finger locations.
Issue Date: 21-Jan-2015
Date Available: 23-Oct-2019
DDC Class: 610 Medizin und Gesundheit
Subject(s): fMRI
vibrotactile stimulation
somatosensory cortex
functional specialization
hierarchical tactile processing
Journal Title: Frontiers in Human Neuroscience
Publisher: Frontiers Media S.A.
Publisher Place: Lausanne
Volume: 8
Article Number: 1070
Publisher DOI: 10.3389/fnhum.2014.01070
EISSN: 1662-5161
Appears in Collections:FG Maschinelles Lernen » Publications

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