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Agraphesthesia, or the lack of graphesthesia ability, results from brain damage, particularly to the parietal lobe, thalamus, and secondary somatosensory cortex. [1]A significant relationship has been found between agraphesthesia and people living with Alzheimer's disease.
Brain areas in the parietal and frontal lobes are associated with the deployment of attention (internally, or through eye movements, head turns or limb reaches) into contralateral space. Neglect is most closely related to damage to the temporo-parietal junction and posterior parietal cortex. [7]
Visual extinction is a neurological disorder which occurs following damage to the parietal lobe of the brain. It is similar to, but distinct from, hemispatial neglect . Visual extinction has the characteristic symptom of difficulty to perceive contralesional stimuli when presented simultaneously with an ipsilesional stimulus, but the ability to ...
Animation. Parietal lobe (red) of left cerebral hemisphere. The parietal lobe is defined by three anatomical boundaries: The central sulcus separates the parietal lobe from the frontal lobe; the parieto-occipital sulcus separates the parietal and occipital lobes; the lateral sulcus (sylvian fissure) is the most lateral boundary, separating it from the temporal lobe; and the longitudinal ...
The dorsal stream ("where pathway") ends in the parietal lobe while the ventral stream ("what pathway") terminates in the temporal lobe. [7] [11] Damage to the parietal lobe is highly correlated with constructional apraxia since it is involved in drawing and copying. The parietal lobe is also critical for remapping spatial position across ...
Studies suggest that brain damage to the parietal lobe causes sensory neglect and that in turn causes extinction. Spatial neglect specifically leads to visual extinction. Neglect often follows right inferior parietal damage, and is characterized by impaired attention and lack of awareness for stimuli on the contralesional (left) side of space. [17]
The superior parietal lobule contains Brodmann's areas 5 and 7. Behind it is the lateral part of the parieto-occipital sulcus, around the end of which it is joined to the occipital lobe by a curved gyrus, the arcus parietooccipitalis. Below, it is separated from the inferior parietal lobule by the horizontal portion of the intraparietal sulcus.
Heterotopagnosia is a neuro-psychological syndrome caused by brain damage in the left parietal lobe and corresponding to an acquired inability in pointing at and locating another person's body parts. [ 1 ] [ 2 ] Its name comes from the Greek: "hetero" which means the other from a pair, "a" combined with "gnosis" which means without knowledge ...