Term
RIGHT OCCIPITAL LOBE LESION
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Definition
-2 Zone Lesions
-VISUAL AGNOSIA
Inability to visually recognize familiar objects
Occipital Cortex
(Areas 18,19)
NON-DOMINANT Hemisphere
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Term
RIGHT OCCIPITAL- PARIETAL-TEMPORAL LOBE BORDER LESION
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Definition
2 - 3 Zone Lesions
PROSOPAGNOSIA
(Agnosia for Faces)
Inabilty to visually recognize familiar faces
Occipital,Posterior Temporal,
Posterior Parietal Cortex
NON-DOMINANT Hemisphere
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Term
RIGHT PARIETAL LOBE LESION
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Definition
2 - 3 Zone Lesions
TIME-SPACE AGNOSIA
* TIME-SPACE AGNOSIA = loss of spatial & temporal orientation
-Spatial Apraxia e.g., dressing apraxia
-Constructional Apraxia –inability to copy a drawing
-Dyscalculia – inability to perform arithmetic calculations
Parietal
Association
Cortex
NON-DOMINANT
Hemisphere
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Term
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Definition
Also a Right Parietal Lobe Lesion
ASOMATOGNOSIA (Body Agnosia) = loss of body image recognition (usually LEFT side of body)
-Sensory Extinction – loss of perception of LEFT side when both right and left sides are stimulated
-Neglect of Left side including left visual field often with Denial of left side of body as part of self and anosognosia (does not recognize one’s own
deficits).
Parietal
Association
Cortex
NON-DOMINANT
Hemisphere
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Term
Temporal
Association
Cortex
NON-DOMINANT
Hemisphere Lesion
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Definition
- Uncoupling of visual and auditory association
- *Memory deficits in visual-spatial data (retrograde amnesia)
- Impaired visual learning
*Lateral temporal lobe has numerous “trigger” cells for memory retrieval
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Term
DOMINANT HEMISPHERE
(Usually Left Hemisphere)
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Definition
The Dominant Hemisphere is defined
as the hemisphere which mediates
communication or language functions.
The Dominant hemisphere also plays
a major role in motor functions and
Performance and contains more
dopamine than the non-dominant
hemisphere.
The LEFT hemisphere is the Dominant
Hemisphere in 95% of the population
including most left handed individuals.
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Term
LEFT PARIETAL LOBE LESION
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Definition
Parietal Association Cortex
DOMINANT
Hemisphere
IDEATIONAL APRAXIA = impaired ability to organize ideas in proper sequence
IDEOMOTOR APRAXIA = impaired ability to transfer a plan of action into a motor
response
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Term
Parieto-Temporal Area
DOMINANT
Hemisphere Lesion
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Definition
VISUAL APHASIA = Inability to read (alexia). Some comprehension loss.
DYSLEXIA - in children is a deficit (often inherited) in the left parieto-temporal cortex which exhibits hypoactivity in PET scans when attempting to read.
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Term
Arcuate Fasciculus Lesion |
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Definition
-Arcuate Fasciculus connects Wernicke’s Receptive (sensory) speech area with Broca’s Expressive (motor) speech area.
CONDUCTION APHASIA – Broca’s and Wernicke’s Areas are Uncoupled. Speech: Cannot repeat or read aloud.
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Term
Watershed Areas
Between
Cerebral Arteries
DOMINANT
Hemisphere Lesion
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Definition
TRANSCORTICAL MOTOR APHASIA = Similar to Broca’s aphasia but less
severe. Repetition is normal.
TRANSCORTICAL SENSORY APHASIA = Similar to Wernicke’s aphasia but less
severe. Repetition is normal.
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Term
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Definition
GLOBAL APHASIA = Widespread language and communication function loss as seen in occlusion of left middle cerebral artery and/or dementia.
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Term
Motor And Sensory Aprosody |
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Definition
MOTOR APROSODY – monotone speech without inflection
SENSORY APROSODY – inability to comprehend emotional import of speech
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