These findings and additional GM abnormalities in parietal areas are consistent with the longitudinal findings performed by Verstraete et al, suggesting that neurodegeneration begins with primary motor cortex and extends to secondary motor cortex in the frontal and parietal lobes [ 63].
Mutism has been frequently observed in cases of insular pathology: Transient mutism is found in cases of left inferior motor cortex damage extending to the insula [ 57, 58], whereas lasting mutism appears to be associated with bilateral lesions of the frontal operculum and anterior insula [ 59- 61].
This analysis revealed high decoding throughout visual cortex, extending again into posterior parietal (SPOC, IPS, SPL) cortex, all areas important in visuo-motor control (e.g., Gallivan et al. 2011a, 2011b; Rossit et al. 2013).
We found that this new distal hypoxic (DH) model of stroke generates a lesion with a volume of 25% of the ipsilateral hemisphere, extends to the motor cortex and causes a behavioral deficit.
They showed abnormalities in the primary motor cortex [ 125– 128], which can also extend in an anterior fashion into the frontal lobes, particularly in patients with associated cognitive problems [ 129].
The motor cortex contains upper motoneurons (UMNs), which extend axons traversing the corticospinal tract to signal to the spinal cord, where lower motoneurons (LMNs) relay their signal.
The expression was most evident in the secondary motor cortex, which lies rostrally to the barrel cortex and extends over the most medial part of the cerebral cortex [31].
A subsequent study extended these data by showing increases in motor cortex excitability during observation of self-faces in the absence of conscious awareness [16].
We suggested that atrophy in premotor and supplementary motor areas in each group extended the feature of focal onset in primary motor cortex to other motor related areas in the frontal areas [ 7, 8].
This damage typically included parts of the motor cortex, lateral dysgranular retrosplenial cortex, and parietal cortex (above dorsal CA1), often extending caudally to reach visual areas.
