Bilateral cortical representation of the trunk midline in human first somatic sensory area

Fabri, Mara; Polonara, Gabriele; Salvolini, U.; Manzoni, T

doi:10.1002/hbm.20099

Cited by 39 publications

(32 citation statements)

References 31 publications

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“…Eickhoff et al (2008) reported a bilateral hemispheric activation after stimulation of the human face and the trunk in BAs 3b, 1, and 2 of humans. Similar findings have been published about the face (Blatow et al, 2007;Ferretti et al, 2004;Iannilli et al, 2008;Naito et al, 2005;Young et al, 2004) and the trunk (Fabri et al, 2005(Fabri et al, , 2006Itomi et al, 2000). Similar findings have been published about the face (Blatow et al, 2007;Ferretti et al, 2004;Iannilli et al, 2008;Naito et al, 2005;Young et al, 2004) and the trunk (Fabri et al, 2005(Fabri et al, , 2006Itomi et al, 2000).…”

Section: Bilateral Activation In Sisupporting

confidence: 87%

Depicting the inner and outer nose: The representation of the nose and the nasal mucosa on the human primary somatosensory cortex (SI)

Gastl

Brünner

Wiesmann

et al. 2014

Human Brain Mapping

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The nose is important not only for breathing, filtering air, and perceiving olfactory stimuli. Although the face and hands have been mapped, the representation of the internal and external surface of the nose on the primary somatosensory cortex (SI) is still poorly understood. To fill this gap functional magnetic resonance imaging (fMRI) was used to localize the nose and the nasal mucosa in the Brodman areas (BAs) 3b, 1, and 2 of the human postcentral gyrus (PG). Tactile stimulation during fMRI was applied via a customized pneumatically driven device to six stimulation sites: the alar wing of the nose, the lateral nasal mucosa, and the hand (serving as a reference area) on the left and right side of the body. Individual representations could be discriminated for the left and right hand, for the left nasal mucosa and left alar wing of the nose in BA 3b and BA 1 by comparing mean activation maxima and Euclidean distances. Right-sided nasal conditions and conditions in BA 2 could further be separated by different Euclidean distances. Regarding the alar wing of the nose, the results concurred with the classic sensory homunculus proposed by Penfield and colleagues. The nasal mucosa was not only determined an individual and bilateral representation, its position on the somatosensory cortex is also situated closer to the caudal end of the PG compared to that of the alar wing of the nose and the hand. As SI is commonly activated during the perception of odors, these findings underscore the importance of the knowledge of the representation of the nasal mucosa on the primary somatosensory cortex, especially for interpretation of results of functional imaging studies about the sense of smell.

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Section: Bilateral Activation In Sisupporting

confidence: 87%

Depicting the inner and outer nose: The representation of the nose and the nasal mucosa on the human primary somatosensory cortex (SI)

Gastl

Brünner

Wiesmann

et al. 2014

Human Brain Mapping

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“…Unilateral tactile stimuli applied to left or right body regions (Table 1) activated the primary (SI; [35, 36]) and secondary (SII; [37]) somatosensory areas in the parietal cortex in all 22 subjects. They also evoked callosal foci, more frequently in the middle CC and in the posterior callosal body (Figure 4).…”

Section: Resultsmentioning

confidence: 99%

Functional Topography of Human Corpus Callosum: An fMRI Mapping Study

2013

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The concept of a topographical map of the corpus callosum (CC) has emerged from human lesion studies and from electrophysiological and anatomical tracing investigations in other mammals. Over the last few years a rising number of researchers have been reporting functional magnetic resonance imaging (fMRI) activation in white matter, particularly the CC. In this study the scope for describing CC topography with fMRI was explored by evoking activation through simple sensory stimulation and motor tasks. We reviewed our published and unpublished fMRI and diffusion tensor imaging data on the cortical representation of tactile, gustatory, auditory, and visual sensitivity and of motor activation, obtained in 36 normal volunteers and in 6 patients with partial callosotomy. Activation foci were consistently detected in discrete CC regions: anterior (taste stimuli), central (motor tasks), central and posterior (tactile stimuli), and splenium (auditory and visual stimuli). Reconstruction of callosal fibers connecting activated primary gustatory, motor, somatosensory, auditory, and visual cortices by diffusion tensor tracking showed bundles crossing, respectively, through the genu, anterior and posterior body, and splenium, at sites harboring fMRI foci. These data confirm that the CC commissure has a topographical organization and demonstrate that its functional topography can be explored with fMRI.

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“…Postcentral gyrus is the location of primary somatosensory cortices. Both postcentral and supramarginal gyri have been shown to be involved in haptic perception (Fabri et al, 2005; Golaszewski et al, 2002; Jones et al, 2007). It has been further argued that anterior insula, frontal operculum and orbitofrontal cortex are involved in integrating olfactory and gustatory perception (de Araujo et al, 2003; Small et al, 2007; Small and Prescott, 2005).…”

Section: Discussionmentioning

confidence: 99%

Category-specific activations during word generation reflect experiential sensorimotor modalities

et al. 2009

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According to the sensorimotor theory of lexicosemantic organization, semantic representations are neurally distributed and anatomically linked to category-specific sensory areas. Previous functional neuroimaging studies have demonstrated category specificity in lexicosemantic representations. However, little evidence is available from word generation paradigms, which provide access to semantic representations while minimizing confounds resulting from low-level perceptual features of stimulus presentation. In this study, 13 healthy young adults underwent fMRI scanning while performing a word generation task, generating exemplars to nine different semantic categories. Each semantic category was assigned to one of three superordinate category types, based upon sensorimotor modalities (visual, motor, somatosensory) presumed to predominate in lexical acquisition. For word generation overall, robust activation was seen in left inferior frontal cortex. Analyses by sensorimotor modality categories yielded activations in brain regions related to perceptual and motor processing: Visual categories activated extrastriate cortex, motor categories activated the intraparietal sulcus and posterior middle temporal cortex, and somatosensory categories activated postcentral and inferior parietal regions. Our results are consistent with the sensorimotor theory, according to which lexicosemantic representations are distributed across brain regions participating in sensorimotor processing associated with the experiential components of lexicosemantic acquisition.

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Bilateral cortical representation of the trunk midline in human first somatic sensory area

Cited by 39 publications

References 31 publications

Depicting the inner and outer nose: The representation of the nose and the nasal mucosa on the human primary somatosensory cortex (SI)

Depicting the inner and outer nose: The representation of the nose and the nasal mucosa on the human primary somatosensory cortex (SI)

Functional Topography of Human Corpus Callosum: An fMRI Mapping Study

Category-specific activations during word generation reflect experiential sensorimotor modalities

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