lecture 16 Flashcards
parietal lobes
parietal lobe function
process and integrate sensory information
why is the parietal lobe good at integrating sensory info
because all of the sensory areas are nearby
5 functional regions of the parietal lobe
postcentral gyrus
posterior parietal cortex (PF and PG)
angular gyrus
precuneus
supramarginal gyrus
4 parietal reach regions of the dorsal stream
medial posterior region
- reach
anterior intraparietal area
- grasp
lateral intraparietal area
saccadic eye movement
- visual tracking
somatosensory areas of the postcentral gyrus project to where?
secondary somatosensory areas in the parietal lobe
motor planning and control areas in the frontal lobe
Area PE (Brodmanns 5) projects to where, to do what
motor areas 4,6, and 8 to guide movement based on limb position
Area PF (Brodmann 7) receives input from where and projects to where
input from PE and project to motor areas
what does area PG do?
integrate info from a bunch of systems, with cognitive input from the cingulate,
to control spatially guided behaviour
3 pathways of the dorsal stream
parieto-premotor - “how” for motor control
parieto-prefrontal - working memory for visuospatial objects
parieto-medial-temporal - project to hippocampus for spatial recognition, navigation and space maps
anterior parietal region function
somatosensory processing
posterior parietal region function
integrate somatosensory info with visual info to guide movement
parietal lobe creates a ____ map why?
multisensory, to enable effortles sinteraction with the world
movement guidance stream and requirement
dorsal stream, representation needs to be on the viewer as we all have diff bodies and proportions and need to know this in relation to the space around us
requires spatial awareness specific to us
object recognition
focus must be object centred, just need to know what it is and where we are in regard to it
this happens in the temporal lobe
activity of neurons in ____ ____ cortex depends on visual stimulation and ____ behaviour of the individual
posterior parietal, ongoing
T/F
some neurons are only active when doing work, and some inactive until you touch the object
true
reaching vs grasping and neuronal activity
spatial neglect is caused by?
parietal lesions
like an attentional blindness
sensorimotor transformation
integration of movement intention with sensory feedback
intention vs actual movement to perform smoothly towards a target
Area PRR
parietal reach region
encodes desired outcome of movement
what do we use to control prosthetic devices
recordings of biofeedback from the PRR area
T/F
spatial info is likely to be localized
false
its likely to be point to point, a list of what to do at each decision point in the route
medial parietal region activity
cells active when specific movement made at specific location, and control body movements to specific locations
egocentric vs allocentric
you are point of reference, eveything else is point of reference
your right vs cardinal directions
an impaired ability to tell L from R and defect in mental manipulation of an object could mean damage to what area
posterior parietal lobe
other parietal lobe functions
arithmetic, language, movement sequences
acalculia
unable to perform calculations, spatial component when doing things like carrying numbers, moving decimals
damage to postcentral gyrus
high sensory thresholds, impaired ability to sense position, impaired steregnosis (identify by touch)
afferent paresis
inability to feel with sensory neurons, means loss of feedback about positions of the limbs causing clumsiness
astereognosis
loss of ability to identify an object by touch
simultaneous extinction
simultagnosia, presented with two objects, can only identify the one on opposite side of lesioned hemisphere
numb touch
like blind sight, can’t tell where they are being touched but they can guess
asomatognosia
condition where patient loses knowledge about their body or condition
anosognosia
unawareness of illness
anosodiaphoria
indifference to illness
autopagnosia
inability to locate or name body parts
asymbolia for pain
lack of typical avoidance reactions to pain, inability to feel pain
aphantasia
inability to imagine
