unilateral neglect is most often associated with damage to the right parietal lobe area of the brain.
unilateral neglect is most often associated with damage to the right parietal lobe area of the brain.
unilateral neglect is most often associated with damage to which area of the brain?
the right parietal lobe
allochiria is a neurological disorder in which the patient responds to stimuli presented to one side of their body as if the stimuli had been presented at the opposite side. it is associated with spatial transpositions, usually symmetrical, of stimuli from one side of the body (or of the space) to the opposite one. thus a touch to the left side of the body will be reported as a touch to the right side, which is also known as somatosensory allochiria. if the auditory or visual senses are affected, sounds (a person's voice for instance) will be reported as being heard on the opposite side to that on which they occur and objects presented visually will be reported as having been presented on the opposite side. often patients may express allochiria in their drawing while copying an image. allochiria often co-occurs with unilateral neglect and, like hemispatial neglect, the disorder arises commonly from damage to the right parietal lobe.
allochiria
the olfactory sense also provides a unique mechanism to test the sensory and representational theories of unilateral neglect. olfactory information projects predominantly to the ipsilateral hemisphere. patients with a right hemisphere lesion show left sided neglect in other modalities and fail to respond to the left contralateral nostril, thus the representational theory is supported. it was suggested that since the olfactory sensory pathways to the cerebral hemispheres were not crossed, a neglect should have occurred on the right side if a sensory loss were the cause of neglect. neglect in olfactory sense is compared with its occurrence in the trigeminal sense, a sense stimulated in the same manner as olfaction (chemically through the nasal passages) but contralaterally innervated. studies supporting the representational theory of unilateral neglect show that right hemisphere lesion patients with left unilateral neglect failed to respond to their left contralateral nostril on olfactory double simultaneous stimulation in spite of adequate olfactory sensitivity. this demonstrated that the occurrence of unilateral neglect is not a function of sensory attenuation, in fact, olfactory sensitivity did not correlate with number of extinctions.
extinction (neurology)