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Psychology (9,565)
PSYC31H3 (100)
Chapter 8

Chapter 8 notes

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University of Toronto Scarborough
Konstantine Zakzanis

PSYC31 Chapter 8 Diffuse brain diseases do not affect all brain structures equally usually results from a widespread condition such as infections, anoxia, hypertension, intoxication, and occurs in most closed head injuries Behavioural expression: memory, attention, concentration disabilities, impaired higher level and complex reasoning, and general response slowing Symptoms tend to be most severe immediately after an injury or they start off subtle and transient then increase as the progressive condition worsens Focal lesions trauma, space-displacing lesions, localized infections, cerebrovascular accidents symptoms of diffuse damage almost always accompany focal lesions of sudden onset Clear cut evidence of focal lesions may not appear until later Focal lesions involve only or mostly one hemisphere Brain regions are not isolated they work together as interconnected, distributed neural networks Lesions of prefrontal cortex have been associated with face recognition memory impairment Lesion site is more likely to predict the nature of the accompanying neuropsychological deficits than its size stroke For TBIs, the size of the lesion may be an important determinant of residual functional capacity The depth and extent to which a cortical lesion involves subcortical tissue will alter the behavioural correlates of similar cortical lesions depth of lesion has been clearly related to the severity of impairment of verbal skills Anosognosia Anosognosia with neglect of the paralyzed side lesions of the right optic region of the thalamus Anosognosia with amnesia for or lack of recognition of the affected limbs occurs with lesions penetrating only to the transmission fibres from the thalamus to the parietal cortex Anosognosia with positive symptoms such as confabulations or delusions lesions limited to the parietal cortex Diachisis Diaschisis depression of activity that takes place in areas of the brain outside the immediate site of damage; usually associated with frontal lesions Applies more appropriately to the depression of relatively discrete or circumscribed clusters of related functions than to global dampening Typically viewed as transient Similar to disconnection syndromes as they both involve disrupted neural transmission through subcortical white matter www.notesolution.com
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