scholarly journals Erratum. Functional magnetic resonance imaging of the primary somatosensory cortex in piglets

2020 ◽  
Vol 26 (2) ◽  
pp. 217
Author(s):  
Ann-Christine Duhaime
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Functional Magnetic Resonance Imaging ◽  
Somatosensory Cortex ◽  
Primary Somatosensory Cortex ◽  
Functional Magnetic Resonance ◽  
Resonance Imaging

scholarly journals Somatotopic Arrangement of the Human Primary Somatosensory Cortex Derived From Functional Magnetic Resonance Imaging

2021 ◽  
Vol 14 ◽  
Author(s):  
W. R. Willoughby ◽  
Kristina Thoenes ◽  
Mark Bolding
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Functional Magnetic Resonance Imaging ◽  
Somatosensory Cortex ◽  
Blood Oxygen Level Dependent ◽  
The Body ◽  
Primary Somatosensory Cortex ◽  
Entire Body ◽  
Functional Magnetic Resonance ◽  
Resonance Imaging

Functional magnetic resonance imaging (fMRI) was used to estimate neuronal activity in the primary somatosensory cortex of six participants undergoing cutaneous tactile stimulation on skin areas spread across the entire body. Differences between the accepted somatotopic maps derived from Penfield's work and those generated by this fMRI study were sought, including representational transpositions or replications across the cortex. MR-safe pneumatic devices mimicking the action of a Wartenberg wheel supplied touch stimuli in eight areas. Seven were on the left side of the body: foot, lower, and upper leg, trunk beneath ribcage, anterior forearm, middle fingertip, and neck above the collarbone. The eighth area was the glabella. Activation magnitude was estimated as the maximum cross-correlation coefficient at a certain phase shift between ideal time series and measured blood oxygen level dependent (BOLD) time courses on the cortical surface. Maximally correlated clusters associated with each cutaneous area were calculated, and cortical magnification factors were estimated. Activity correlated to lower limb stimulation was observed in the paracentral lobule and superomedial postcentral region. Correlations to upper extremity stimulation were observed in the postcentral area adjacent to the motor hand knob. Activity correlated to trunk, face and neck stimulation was localized in the superomedial one-third of the postcentral region, which differed from Penfield's cortical homunculus.

Functional magnetic resonance imaging of the primary somatosensory cortex in piglets

2006 ◽  
Vol 104 (4) ◽  
pp. 259-264 ◽  
Author(s):  
Ann-Christine Duhaime ◽  
Andrew J. Saykin ◽  
Brenna C. McDonald ◽  
Carter P. Dodge ◽  
Clifford J. Eskey ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Functional Magnetic Resonance Imaging ◽  
Somatosensory Cortex ◽  
Primary Somatosensory Cortex ◽  
Functional Magnetic Resonance ◽  
Resonance Imaging

scholarly journals Functional Magnetic Resonance Imaging and Somatosensory Evoked Potentials in Rats with a Neonatally Induced Freeze Lesion of the Somatosensory Cortex

2004 ◽  
Vol 24 (12) ◽  
pp. 1409-1418 ◽  
Author(s):  
Wolfram Schwindt ◽  
Michael Burke ◽  
Frank Pillekamp ◽  
Heiko J. Luhmann ◽  
Mathias Hoehn
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Functional Magnetic Resonance Imaging ◽  
Evoked Potentials ◽  
Somatosensory Cortex ◽  
Somatosensory Evoked Potentials ◽  
Magnetic Resonance Images ◽  
Projection Area ◽  
Functional Magnetic Resonance ◽  
Resonance Imaging

Brain plasticity is an important mechanism for functional recovery from a cerebral lesion. The authors aimed to visualize plasticity in adult rats with a neonatal freeze lesion in the somatosensory cortex using functional magnetic resonance imaging (fMRI), and hypothesized activation outside the primary projection area. A freeze lesion was induced in the right somatosensory cortex of newborn Wistar rats (n = 12). Sham-operated animals (n = 7) served as controls. After 6 or 7 months, a neurologic examination was followed by recording of somatosensory evoked potentials (SSEPs) and magnetic resonance experiments (anatomical images, fMRI with blood oxygen level–dependent contrast and perfusion-weighted imaging) with electrical forepaw stimulation under α-chloralose anesthesia. Lesioned animals had no obvious neurologic deficits. Anatomical magnetic resonance images showed a malformed cortex or hyperintense areas (cysts) in the lesioned hemisphere. SSEPs were distorted and smaller in amplitude, and fMRI activation was significantly weaker in the lesioned hemisphere. Only in a few animals were cortical areas outside the primary sensory cortex activated. The results are discussed in respect to an apparent absence of plasticity, loss of excitable tissue, the excitability of the lesioned hemisphere, altered connectivity, and a disturbed coupling of increased neuronal activity to the hemodynamic response.

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