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  • 1
    Electronic Resource
    Electronic Resource
    Layer V pyramidal cells in the adult human cingulate cortex (1993)
    Springer
    Anatomy and embryology 187 (1993), S. 515-522 
    Details
    ISSN: 1432-0568
    Keywords: Cingulate cortex ; Morphometry ; Image analysis ; Dendritic arborization ; Architecture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The anterior and posterior parts of the human cingulate cortex differ in their absolute number of neurons per unit volume, with fewer neurons in the anterior part. To test the hypothesis that lower absolute number and packing density of neurons in the anterior cingulate cortex are associated with an increased complexity in the neuropil compartment, dendritic arborizations of layer V neurons in both cingulate parts were analyzed in a Golgi study. Results show that these neurons in the anterior cingulate cortex have more primary and secondary basal dendrites than those in the posterior cingulate cortex. This establishes an association of a higher complexity of the dendritic arborization in the anterior cingulate cortex with a lower cell number per unit volume and larger neuropil compartment. The significant lower degree of dendritic arborization in the posterior cingulate cortex is accompanied by a higher cell packing density. These structural differences are associated with functional differences between the two parts of the human cingulate cortex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00214429
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Inter-subject variability of cerebral activations in acquiring a motor skill: a study with positron emission tomography (1994)
    Springer
    Experimental brain research 98 (1994), S. 523-534 
    Details
    ISSN: 1432-1106
    Keywords: positron emission tomography ; Regional cerebral blood flow ; Motor learning ; Brain mapping ; Human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Cerebral structures activated during sequential right-hand finger movements were mapped with regional cerebral blood flow (rCBF) measurements by positron emission tomography (PET) in individual subjects. Nine healthy volunteers were examined twice; after initial learning and after practicing the finger movement sequence for more than 1 h. Task-specific activation sites were identified by statistical distributions of maximal activity and region size in rCBF subtraction images. A consistent task specific activation in all nine subjects was detected in the contralateral sensorimotor cortex at an average movement rate of 3.2 Hz reached after practice. This corresponded to a significant increase of the mean rCBF in the left primary sensorimotor cortex in spatially standardised and averaged PET images. Additional task specific activation sites detected by individual analysis were found in the lateral and medial premotor, parietal, and cingulate areas, and in subcortical structures including the basal ganglia of both cerebral hemispheres. These activations showed no or little spatial overlap from subject to subject, thus being obscured in the analysis of pooled data. The observed activity patterns were related to movement rate and accuracy in individual subjects. It is suggested that the rCBF changes associated with acquisition of a motor skill in individual humans may correspond to plasticity of sensorimotor representations reported in monkeys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233989
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Individual somatotopy of primary sensorimotor cortex revealed by intermodal matching of MEG, PET, and MRI (1992)
    Springer
    Brain topography 5 (1992), S. 183-187 
    Details
    ISSN: 1573-6792
    Keywords: Movement-related neuromagnetic fields ; Movement evoked field I ; Regional cerebral blood flow ; Brain mapping ; Motor activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A method for comparing estimated magnetoencephalographic (MEG) dipole localizations with regional cerebral blood flow (rCBF) activation areas is presented. This approach utilizes individual intermodal matching of MEG data, of rCBF measurements with [15O]-butanol and positron emission tomography (PET), and of anatomical information obtained from magnetic resonance (MR) images. The MEG data and the rCBF measurements were recorded in a healthy subject during right-sided simple voluntary movements of the foot, thumb, index finger, and mouth. High resolution 3D-FLASH MR images of the brain consisting of 128 contiguous sagittal slices of 1.17-mm thickness were used. MEG/MR integration was performed by superimposing the 3D head coordinate system constructed during the MEG measurement onto the MR image data using identical anatomical landmarks as references. PET/MR integration was achieved by a phantom-validated iterative front-to-back-projection algorithm resulting in one integrated MEG/PET/MR image. The estimated dipole locations followed the somatotopic organisation of the task-specific rCBF increases as evident from PET, although they did not match point-to-point. Our results demonstrate that intermodal matching of MEG, PET and MR data provides a tool for relating estimated neuromagnetic field locations to task-specific rCBF changes in individual subjects. Our method offers the perspective of refined dipole modelling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01129048
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    Paper (German National Licenses)
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