chapter 14: the parietal lobe and networks Flashcards
What is the general main function of the parietal lobe?
Processing, integrating, communicating sensory information.
What is the anatomical name of the primary sensory cortex (S1)?
The postcentral gyrus.
What three major areas do S1 project to?
Secondary somatosensory areas, motor planning areas and motor control areas in frontal lobe.
What functions do Areas PE and PF serve?
Receiving somatosensory input and projecting to motor areas.
PE, aka BA 5, (S2) receives sensory input, projects to motor areas (BA 4, 6, 8) providing info on limb position.
PF, aka BA 7, receives sensory input, projects to motor areas
What does area PG do?
Integrates sensory information with cognitive input from cingulate to control spatially guided behaviour.
What three pathways make up the dorsal stream?
Parieto-premotor pathway, parieto-prefrontal pathway, parieto-medial-temporal pathway.
Which pathway in the dorsal stream is the primary ‘how’ pathway of motor control?
The parieto-premotor pathway.
Which dorsal stream pathway in involved in working memory for visuospatial objects?
The parieto-prefrontal pathway.
Which dorsal stream pathway projects to the hippocampus, is important for spatial recognition and navigation?
The parieto-medial-temporal pathway.
The posterior parietal cortex is imoprtant for __________ behaviours, more ventral regions involved in __________ function.
visuospatial, perceptual.
The anterior parietal regions process __________ information, the posterior regions integrate __________ and __________ information.
sensory, somatosensory and visual.
Parietal lobe is involved in creating __________ __________ of world to enable subconscious interaction with surroundings.
multisensory map.
__________ lobe seems to encode information about how objects relate to each other.
Temporal.
For movement guidance, representation must be __________-oriented, for object recognition, must be __________-oriented.
viewer, object.
Which area is responsible for integration of movement intention with sensory feedback about intended movement?
Area PRR.
What brain area is responsible for internal map and route knowledge?
Medial parietal region (precuneus area).
Describe the two different spatial frames of reference.
Egocentric frame: organized in relation to the viewer
Allocentric frame: organized in relation to viewed object
Damage to which brain area can lead to high sensory thresholds, impaired proprioception, impaired stereognosis?
Postcentral gyrus (primary somatosensory cortex).
What is astereognosis?
Loss of ability to identify objects by touch.
What is simultaneous extinction?
Inability to recognize more than one object at once when presented with both; can result from S2 damage.
What is numb touch?
Loss of sensation from region but retention of ability to accurately report where they were touched in that region.
Somatosensory equivalent of blindsight.
What is asomatognosia?
Asomatognosia: Loss of knowledge/awareness about own body or condition.
tight parietal strokes often result in __________ __________ neglect.
left hemispatial.
Contralateral neglect is often comorbid with what agnosia?
Simultagnosia.
Describe ideomotor and construction apraxia.
Idomotor apraxia: Inability to copy movements made by others
Construction apraxia: Issues with spatial organization, inability to assemble puzzles, draw pictures, copy facial movements
The visuomotor guidance system belongs to which stream passing through parietal lobe?
Dorsal.
Left-parietal damage may impair __________ of mental images, right-parietal damage may impair __________.
formation, manipulation.
Describe the somatosensory threshold test.
Blindfolded subject reports feeling one or two touches and points are progressively brought together.
Which areas are involved in which functions in the tactile form recognition test?
Areas PE and PF involved in shape manipulation, PG in drawing.
Describe the common contralateral neglect test covered in class.
Subject draws vertical line to bisect. Contralateral neglect results in line shifted to the right.
Which brain area affects ability to perform visual perception test (completing drawings)?
Right temporoparietal junction.
Which brain areas affect ability to perform spatial relation test (knowing right/left body part relations)?
Left parietal, left frontal.
