Sensation and perception - integrates sensory
information to form a single perception ([cognition]
Integrating sensory input - primarily with
the visual system. It constructs a spatial coordinate system to
represent the world around us, including our body image and spatial
In this way, our bodies possess an inner sensory map, with a spatial
connection to each finger, arm, toe, foot etc. This is why amputees
often still feel as though the missing limb is still attached -
as the mind map still associates its presence in relation to the
rest of the body.
Video - Brain Mind Lecture 4: The Parietal Lobes
An Introductory Overview: Body Image, Phantom Limbs, Phantom Limb
Pain, Apraxia, Agnosia, Language, by Rhawn Joseph, Ph.D.
NOTE: To reduce confusion, all CT images have been reversed so
damage on the left appears on the left, and right sided damage appear
on the right.
Damage to Left Parietal Lobe
Damage to the left parietal lobe can result in "Gerstmann's
Syndrome." This results in right-left confusion and is associated
Difficulty with Writing - agraphia
Difficulty with Mathematics - acalculia
Disorders of language - aphasia
Inability to perceive objects normally - agnosia
Left parietal-temporal lesions can effect verbal memory and the
ability to recall strings of digits.
Damage to Right Parietal Lobe
Damage to the right parietal lobe can result in neglecting part
of the body or space affecting grooming and dressing. It can also
Difficulty in making things - constructional apraxia
Denial of deficits - anosagnosia
The right parietal-temporal lobe is concerned with non-verbal memory.
Right parietal-temporal lesions can produce significant changes
Damage to Both Parietal Lobes
Bi-lateral damage, for example due to large lesions, can cause
a visual attention and motor syndrome called 'Balint's Syndrome'.
This is characterized by:
Inability to voluntarily control the gaze - ocular apraxia
Inability to integrate components of a visual scene - simultanagnosia
Inability to accurately reach for an object with visual guidance
- optic ataxia
Memory and personality deficits can also occur if there is damage
to the area between the parietal and temporal lobes.