The Parietal Lobes Flashcards Preview

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Flashcards in The Parietal Lobes Deck (19):

What area of the parietal lobes controls saccadic eye movements?

-Intraparietal sulcus (cIPS)


What is the function of the somatosensory strip?

-To area PE - tactile recognition
-To motor regions - sensory information about limb movement and position


What is the function of area PE?

-Input from somatosensory strip
-Outputs to primary motor cortex, supplementary motor cortex, premotor regions, and area PF


What is the function of area PF?

-Input from somatosensory, primary motor cortex, premotor cortex, and small visual input through area PE


What is the function of area PG?

-Receives complex connections including visual, somesthetic, proprioceptive, auditory, vestibular, oculomotor, and cingulate connections


What is the function of the connections between posterior parietal (PF and PF) and the prefrontal cortex?

-Controlling spatially guided behaviour


What is the general theory of parietal lobe function? (What do the anterior and posterior zones do?)

-Anterior - process somatic sensations and perceptions
-Posterior - integrate information from vision with somatosensory information for movement
-Spatial map in the brain?


What can spatial information be used for?

-Object recognition (details of object are important; posterior parietal cortex)
-Guidance of movement (sensitive to eye movements; posterior parietal cortex)
-Sensorimotor information (relative position of body with respect to sensory feedback from movements being planned and made; posterior parietal cortex)
-Movement planning (desired goal of movement)
-Spatial navigation (cognitive spatial map - unconscious knowledge of how to reach a destination; medial parietal region)


What do lesions to the post-central gyrus produce?

-Abnormally high sensory thresholds
-Impaired position sense
-Deficits in stereogenesis, or tactile perception
-Afferent paresis (clumsy finger movements due to lack of feedback about finger position)


What is astereognosis?

-Inability to recognize an object by touch


What is simultaneous extinction?

-Failure to report stimuli on one side of the body


What is blind touch?

-Cannot feel stimuli, but can report location


What are the agnosias?

-Asomatognosia (loss of knowledge or sense of one's own body)
-Anosognosia (unaware/denial of illness)
-Anosodiaphoria (indifference for illness)
-Asymbolia for pain (absence of normal reactions to pain)
-Finger agnosia (unable to point to fingers or show them to examiner)


What are some symptoms of posterior parietal lobe damage?

-Balint's syndrome (can't fixate on visual stimulus; neglect of objects; optic ataxia)
-Contralateral neglect (right parietal lesions; neglect for visual, auditory, and somesthetic stimulation on one side of the body or space; caused by defective sensation or perception or defective attention or orientation)
-Poor object recognition
-Perceptual classification deficit
-Gerstmann syndrome (finger agnosia, right-left confusion, agraphia, acalculia; results from left parietal lobe lesion)


What is apraxia?

-Movement disorder in which loss of movement is not caused by any other disorder of movement
-Left parietal lobe damage


What is ideomotor apraxia?

-Cannot copy serial movements
-More likely to be associated with left parietal lesions


What is constructional apraxia?

-Cannot copy pictures, build puzzles, or copy a series of facial movements
-Associated with left and right parietal lesions


What are the symptoms of posterior parietal damage?

-Deficits in drawing (right parietal lobe damage)
-Spatial attention deficits (cannot shift attention between stimuli)


What are the characteristics of disorders of spatial cognition?

-Left hemisphere deficit may result from inability to generate image
-Right hemisphere deficit may result from inability to manipulate image
-Mental rotation requires mental imaging of the stimulus and manipulation of the image