Second Somatosensory Cortex and Related Areas

Burton, Harold

doi:10.1007/978-1-4613-2149-1_2

Cited by 131 publications

(94 citation statements)

References 197 publications

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“…PPC as a part of the association cortex probably integrates information from different body parts, and accordingly had signs of intermingled finger representation. Convergence of afferent impulses from different fingers and even from larger body parts to single neurons in SII and PPC has been observed previously in monkeys [8,23]. The present results support these findings and suggest similar convergence of tactile information in humans.…”

Section: Discussionsupporting

confidence: 92%

Interaction between afferent input from fingers in human somatosensory cortex

Forss¹,

Jousmäki²,

Hari³

1995

Brain Research

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We recorded somatosensory evoked magnetic fields from eight healthy subjects with a 122-channel whole-scalp SQUID magnetometer. The stimulus sequence consisted of 'standard' stimuli (85%) delivered to palmar side of the left thumb with an interstimulus interval of 0.6 s and of 'deviants' (15%), randomly interspersed among the standards, to little finger, and vice versa. Both stimuli activated four source areas: the contralateral primary somatosensory cortex (SI), the contra-and ipsilateral secondary somatosensory cortices (SII), and the contralateral posterior parietal cortex (PPC). The short-latency (20-40 ms) responses originated in the SI cortex, whereas long-latency responses arose from all 4 areas. At SII and PPC, the deviant stimuli elicited larger responses when presented alone, without intervening standards, than among standards. This implies interaction between afferent impulses from the two fingers and/or partly intermingled cortical representations. Our findings show, in agreement with animal data, different excitatory/inhibitory balance in the various somatosensory areas.

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Section: Discussionsupporting

confidence: 92%

Interaction between afferent input from fingers in human somatosensory cortex

Forss¹,

Jousmäki²,

Hari³

1995

Brain Research

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“…It is composed of three different cytoarchitectural areas based on the degree of granulation of cortical layers II and IV [3,15]. The agranular region is located more anterior and inferior in the insular cortex, followed posteriorly by the dysgranular cortex.…”

Section: Introductionmentioning

confidence: 99%

Into the Island: A new technique of non-invasive cortical stimulation of the insula

Andrade

Galhardoni

Pinto

et al. 2012

Neurophysiologie Clinique/Clinical Neurophysiology

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“…3. [Reproduced with permission from Lenz et al (1998a).] (Burton 1986;Robinson and Burton 1980). Different weighting of these inputs may explain some features of somatotopic reorganization, as discussed below.…”

Section: Injury Dependent Plasticity: Summarymentioning

confidence: 99%

Neuronal responses to tactile stimuli and tactile sensations evoked by microstimulation in the human thalamic principal somatic sensory nucleus (ventral caudal)

Schmid

Chien

Greenspan

et al. 2016

Journal of Neurophysiology

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. Neuronal responses to tactile stimuli and tactile sensations evoked by microstimulation in the human thalamic principal somatic sensory nucleus (ventral caudal). J Neurophysiol 115: 2421-2433, 2016. First published February 10, 2016 doi:10.1152/jn.00611.2015.-The normal organization and plasticity of the cutaneous core of the thalamic principal somatosensory nucleus (ventral caudal, Vc) have been studied by single-neuron recordings and microstimulation in patients undergoing awake stereotactic operations for essential tremor (ET) without apparent somatic sensory abnormality and in patients with dystonia or chronic pain secondary to major nervous system injury. In patients with ET, most Vc neurons responded to one of the four stimuli, each of which optimally activates one mechanoreceptor type. Sensations evoked by microstimulation were similar to those evoked by the optimal stimulus only among rapidly adapting neurons. In patients with ET, Vc was highly segmented somatotopically, and vibration, movement, pressure, and sharp sensations were usually evoked by microstimulation at separate sites in Vc. In patients with conditions including spinal cord transection, amputation, or dystonia, RFs were mismatched with projected fields more commonly than in patients with ET. The representation of the border of the anesthetic area (e.g., stump) or of the dystonic limb was much larger than that of the same part of the body in patients with ET. This review describes the organization and reorganization of human Vc neuronal activity in nervous system injury and dystonia and then proposes basic mechanisms. amputation; dystonia; neurophysiology; spinal transection; single neuron recordings; ventral posterior thalamus

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Second Somatosensory Cortex and Related Areas

Cited by 131 publications

References 197 publications

Interaction between afferent input from fingers in human somatosensory cortex

Interaction between afferent input from fingers in human somatosensory cortex

Into the Island: A new technique of non-invasive cortical stimulation of the insula

Neuronal responses to tactile stimuli and tactile sensations evoked by microstimulation in the human thalamic principal somatic sensory nucleus (ventral caudal)

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