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01:830:310 (162)
Lecture 18

01:830:310 Lecture 18: Lecture 18 - Parietal lobe disorders 2 Frontal lobes.doc

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Professor Mayhew

Symptoms Posterior Parietal Damage - Contralateral neglect/ hemispatial neglect or unilateral neglect - right inferior parietal lesions - Ignore the left side of the body o They can see things on their left side (evoked response potential) but they are not giving it attention o Anosognosia – they don’t believe that they are ignoring half of the world o Can only read stuff on the right, when writing, they will only write on the right side, copying pictures, they will only draw the right side o Doesn’t completely go away Gertsmann Syndrome - Left parietal damage - Is it really a problem? very rare - Requires all 4 symptoms – finger agnosia (no knowledge of what finger), right- left confusion, agraphia, and acalculia Apraxia - disorder of movement, exclusionary diagnosis - It isn’t due to weakness, inability to move, abnormal muscle tone/posture, Alzheimer’s (intellectual deterioration) and etc, tremor - Due to lesions in places in the brain having to do with motor skills - Loss of knowing the sequence of movements need to be done (cannot order movements in the correct way) - Speech, instructional, oral, etc. types of apraxia - Not direct lesion in parietal lobe, it just has to do with the ordering Spatial cognition - right side: ability to use topographic info (map to a place) is tampered with - left side: cannot make mental images Frontal Lobe - fifth-third of neocortex (a lot of brain) - Last part of brain to develop, synaptic pruning and synaptogenesis and myelination take longer in this lobe - total efficient transfer here doesn’t occur till we are in our 20s - Emotion/impulse control moderated here - first thing to deteriorate when aging (control of attention, planning, organize and sequence things Function - output generator; all the other lobes take input from senses; they take all the info from the other lobes and decide what to do about it - Usually for actions Anatomy - primary motor cortex - Anterior to the PMC are the premotor cortex and the supplementary cortex which make up secondary motor cortex o Involved in motion and movement - Anterior to the secondary cortex is the prefrontal cortex(frontmost part) o 4 divisions o 8, 6 and 44 are secondary areas
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