Parietal Lobe Flashcards
what are the sensory information processing areas in the cortex
Primary somatosensory area (BA 1,3,2)
- Secondary somatosensory area (BA 5,7)
- Parietotemporal association area (BA 39,40)
What does the primary somatosensory area do
-Discriminates shape, texture or size of objects
What does the secondary somatosensory area do
-stereognosis (ability to know with eyes shut what is in hand–> stores memory about tactile sensation) and memory of the tactile and spatial environment
What does the parietotemporal association area do
-sensory integration and spatial relations, understanding language
What are some types of perceptual dysfunction
- Agnosias
- Spatial disorders
- unilatereal neglect
- apraxias
- aphasias
What lesion causes agnosis
Lesions of secondary cortical areas
What is agnosis
inability to recognise or make sense of incoming sensory information
What are different types of agnosia
- Tactile agnosia (stereognosis)
- Visual Object agnosia (inability to differentiate b/w visual objects)
- Auditory agnosia (can’t differentiate sound)
- Alexia/dyslexia (trouble understanding written language)
- Colour agnosia (can’t tell b/w colour
What is a consequence of lesions of tertiary cortical areas
Agnosias
What are different types of agnosia
Anosognosia
Asomatognosia
Autotopagnosia
Prosopagnosia
What is anosognosia
failure to perceive illness, a defect or that denial of a defect
What is anosodiaphoria
indifference to or lack of concern about illness (mild form of anosognosia)
What is asomatognosia
lack of recognition of body
What is somatoparaphrenia
Elaborate delusions of who the body part might belong to
-form of asomatognosia
What is prosopagnosia
inability to recognise familiar faces including ones own face
What are visuospatial abilities
abilities related to understanding and conceptualizing visual representation and spatial relationships in learning and performing a task
What is the dominant parietal lobe for spatial analysis
right parietal lobe
What does spatial perception include
depth perception
direction perception
distance perception
motion perception
What does visual perception include
size
shape
form discrimination
What is topographical disprientation
inability to orientate in the environment
What is unilateral neglect
usually occurs following a lesion to right parietal cortex=left neglect
- an attention disorder
- pts fail to report, respond or orient to meaningful stimuli presented on affected side
what is motor apraxia
Motor apraxia is an impairment of the capacity to perform purposeful movement not due to any primary motor or sensory deficit or because of a lack of comprehension, attention or willingness to perform the movement
what is ideomotor apraxia
impaired ability to
perform a skilled gesture with a limb upon verbal
command and/or by imitation
What is ideational apraxia
disturbance of voluntary
movement in which pt misuses objects
because they have difficulty identifying the
concept or purpose behind objects
What is constructional apraxia
when there is evidence of poor drawing and
constructional capabilities
What is dressing apraxia
Dressing apraxia is an inability to orientate
clothing to the body in terms of order and
laterality
What is receptive aphasia
inability to
understand spoken or
written language
What is expressive aphasia
inability to express
oneself using spoken
or written language
What is global aphasia
is an inability to use language in any form (producing, comprehending and writing/reading language)
