Parietal lobes

Mind Map by , created almost 6 years ago

PSYB65 Mind Map on Parietal lobes, created by andreaarose on 12/11/2013.

Created by andreaarose almost 6 years ago
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Parietal lobes
1 Subdivisions
1.1 Post central gyrus
1.1.1 Brodmann's area 1, 2, 3
1.2 Superior parietal lobule
1.2.1 Brodmann's area 5, 7
1.3 Parietal operculum
1.3.1 Brodmann's area 43
1.4 Inferior parietal lobule
1.4.1 Supramarginal gyrus Brodmann's area 40
1.4.2 Angular gyrus Brodmann's area 39
1.5 Functional zones
1.5.1 Anterior zone Somatosensory cortex 1, 2, 3, 43 Process somatic sensations and perceptions
1.5.2 Posterior zone Posterior parietal cortex Remaining areas Integrate information from vision with somatosensory information for movement
2 A theory of parietal lobe function
2.1 Use of spatial information
2.1.1 Object recognition Viewer centered object identification Posterior parietal cortex
2.1.2 Guidance of movement Sensitive to eye movements Posterior parietal cortex
2.1.3 Cognitive spatial map Route knowledge, unconscious knowledge of how to reach a destination
2.2 Three symptoms do not fit with the visuomotor view of the parietal lobe
2.2.1 Difficulties with arithmetic Acalculia Might result from the spatial properties of addition and subtraction Two digit number occupy different spaces "Borrowing" during subtraction
2.2.2 Difficulties with certain aspects of language Words have spatial organization Tap vs. pat
2.2.3 Difficulties with movement sequences Individual elements of the movement have a spatial organization
3 Somatosensory symptoms of parietal lobe lesions
3.1 Lesions to the post central gyrus
3.1.1 Abnormally high sensory thresholds
3.1.2 Impaired position sense
3.1.3 Deficits in stereogenesis, also tactile perception
3.2 Somatoperceptual disorders
3.2.1 Astereognosis Inability to recognize an object by touch
3.2.2 Simultaneous extinction Two stimuli are applied simultaneously to opposite sides of the body A failure to report a stimulus on one side is referred to as extinction
4 Symptoms of posterior parietal lobe damage
4.1 Contralateral neglect
4.1.1 Neglect for visual, auditory and somethetic stimulation on one side of the body or space
4.1.2 During recovery, patients go through allesthesia and then simultaneous extinction Allesthesia - begins to respond to the neglected stimuli as if they were on the other side of the body
4.1.3 Lesion most often in the right inferior parietal lobe Right intraparietal sulcus and the right angular gyrus
4.2 Object recognition
4.2.1 After right parietal lobe lesions, patients are poor at recognizing objects in unfamiliar views
4.3 Apraxia
4.3.1 Movement disorder in which the loss of movement is not caused by weakness, inability to move, abnormal muscle tone, intellectual deterioration, or other disorders of movement
4.3.2 Ideomotor apraxia Cannot copy serial movements More likely to be associated with left parietal lesions
4.3.3 Constructional apraxia Cannot copy pictures, build puzzles, or copy a series of facial movements Associated with right and left parietal lesions
4.4 Deficits in drawing appear after damage to the right parietal lobe
4.5 Spatial attention
4.5.1 Function of the parietal lobe to selectively attend to different stimuli
4.5.2 Disengagement Shifting attention from one stimulus to the next
4.5.3 Disorders of spatial cognition Mental rotation requires: Mental imaging of the stimulus Manipulation of the image LH deficit may result from the inability to generate the image RH deficit may result from the inability to manipulate the image

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