name: main functions of parietal lobes
- process + integrate somatosensory info
- process + integrate visual info
- spatial awareness + orientation
⤷ proprioception (body position) - math + numerical control
⤷ bc manipulating spatial aspects of numbers
name: borders along parietal lob
- anterior border = central fissure
- ventral border = sylvian/lateral fissure
- posterior border = parietooccipital sulcus
- dorsal to cingulate gyrus
question: what is post central gyrus?
- gyri after central fissure
- in parietal lobe
- main sensory receptive area for touch
question: what is inferior parietal lobe?
- connects to supramarginal gyrus + angular gyrus
- multimodal area that gets aud., vis., and somatosensory inputs
- is one of the last struc. to mature
⤷ explains why kids don’t read + write until 5 - 6 yrs
question: what is superior temporal gyrus?
- connects to inferior parietal lobe
- above superior temporal sulcus
- has wernicke’s area
- superior part of temporal lobe
⤷ most upper part
question: what is angular gyrus
- connects to inferior parietal lobe
- involved in comprehension of written lang.
- plays a role in converting words into meaningful info
⤷ integrates vis. info w/ language processing areas
**giving words meaning = temporal, spatial aspects of letter = parietal
⤷ therefore connected to both lobs
question: what did cecile and oskar vogt do?
- electrophysiological mapping in patients + monkey
- compared results to understand functional role of architectonically defined areas
question: what did brodmann do?
- subdivided cortex into areas based on regional differences
⤷ diff. in distribution, density, size of cells, shape
name: subdivisions of parietal lobe (brodmann’s cycoarchitectonic regions)
- anterior zone = 1, 2, 3, 43
⤷ somatosensory cortex - posterior zone = everything else (closest to occipital)
⤷ where/how path (integrating vision w/ multimodal info)
question: areas of posterior zone of parietal lobe?
PE, PF, PG
name + explain: connections and function of areas of posterior zone of parietal lobe
PE
- connects to:
⤷ somatosensory cortex
⤷ motor cortex
⤷ PF
- does somatosensory func.
- guiding mvt. bc info about limb position
PF
- connects to:
⤷ somatosensoty cortex
⤷ motor + premotor cortex
⤷ PG
- mirror neuron system
⤷ involves attention
⤷ mirrors activity of others
PG
- connects to :
⤷ vis, proprioceptive, aud, vestibular, oculomotor info
⤷ cingulate connections
⤷ prefrontal cortex
⤷ limbic sys.
- multimodal
- involved in dorsal stream
- memory
- spatial navigation + spatially guided behaviour
name + explain: paths from posterior parietal regions
- parieto-premotor
⤷ where/how path - parieto-prefrontal
⤷ working memory - parieto-medial temporal
⤷ spatial navigation
define: afferent paresis
- clumsy finger mvt.
- from lack of feedback about finger position
- from parietal lobe lesion
⤷ somatosensory effect
define: astereognosis
- ## inability to recog. an object by touch
question: how to test for the occurrence of simultaneous extinction?
**simultaneous extinction = inability to perceive multiple stim. of the same type at the same time
⤷ issue w/ attention effect on vision
- when shown 2 identical objects:
⤷ patient only sees object in 1 field - when shown 2 diff. objects:
⤷ patient sees both in both fields - when shown 2 of the same kind of object:
⤷ patient still only sees 1 field
name: somatosensory disorders (types of asomatognosia) (4)
**asomatognosia = loss of knowledge of body
1. anosognosia
⤷ unawareness/denial of illness
- anosodiaphoria
⤷ indifference to illness
⤷ recog. but don’t care - asymbolia for pain
⤷ absence of normal reactions to pain - finger agnosia
⤷ unable to point to the fingers/unable to show to examiner
define: allesthesia
- responding to previously neglected stim. as if they were on the other side of the body
- often a result of recovery from contralateral neglect
define: contralateral neglect
- neglect for vis., aud., and somesthetic (skin) stim. on one side of the body
- often from right parietal lesion
⤷ right intraparietal sulcus + right angular gyrus
question: how does a lesion in the right parietal lobe affect object recognition?
- poor at recog. objects in unfamiliar view
- R side mediates orientation
explain: line-bisection test
- indicator for contralateral neglect
- asked to cut line in half
- if neglecting one side: bisection won’t be in the middle
explain: mooney closure faces test
- present various panels + ask which show a face
- many panels -> recruiting temporal and parietal
⤷ temporal = recognition (face)
⤷ parietal = panels spread over space (where path)
explain: kimura box test
- test for apraxia
⤷ loss of skilled movement - can’t copy body movements + organize spatial movements
⤷ ex. doing mvts. in sequence
