Acquired Language Disorders Flashcards
Describe a lesion to the frontal lobe.
- Lack of inhibition to behaviours
- May have normal intelligence + memory
- Personality change (impulse control, quick
temper, irritability) - Difficulty carrying out consciously
organized activities
Describe a right sided lesion to the temporal lobe.
Non-verbal memory –> visual memory deficits
Describe a right sided lesion to the parietal lobe.
- Complex perceptual disorders of
spatial orientation, body schema
(where your body is in space),
memory - Hemispatial neglect = neglect
opposite side of body
Describe the function of the primary motor cortex.
What lobe?
Damage = ?
- Located anterior to central sulcus –> precentral gyrus
- Each hemisphere controls motor function on opposite side of body
- Controls voluntary movements of skeletal muscle by generating motor
commands directly to cranial + spinal nerves - Speech, hand, finger movements + hand-eye coordination
- Damage to this area brain damage or spinal cord injury = hemiplegia
Describe the function of the premotor cortex.
What lobe?
Damage = ?
- Located anterior to primary motor cortex - frontal lobe
- Guide voluntary body movements + integrates sensory input
Describe the function of the supplementary motor cortex.
What lobe?
Damage = ?
- Located behind premotor cortex (frontal lobe)
- Involved in planning complex motor movements
- Regulates movements under internal control (sequence of movements from memory that are learned/repetitive)
Describe the function of the supplementary motor cortex.
What lobe?
Damage = ?
- Located in anterior frontal lobe
- Higher aspects of motor control + planning/execution of behavior
- Cognitive functions à control of behavior, abstract thinking, reasoning
Describe Broca’s area
What lobe?
Damage = ?
- Important in speech production –> control motor movement for speech production
- Well-articulated fluent speech
- Damaged –> motor speech problems (lost ability to speak despite comprehension)
- Located in inferior frontal gyrus in left hemisphere of frontal lobe
Describe what the left and right side of the temporal lobes are responsible for.
RIGHT side = auditory association analyzes nonverbal stimuli (music, prosody)
LEFT side = auditory association analyzes speech sound (person recognize words/sentences)
What to expect with a right sided temporal lobe lesion?
Non-verbal memory –> Visual memory deficits
Describe the difference between the primary, secondary, and association areas of the cerebral cortex.
PRIMARY:
- Most sensory information first arrives
- Primary motor area sends commands to muscles
SECONDARY:
- Higher order visual, somatosensory + auditory
areas
- Located near primary area
- Information further processed
ASSOCIATION AREAS:
- Prefrontal, limbic, parietal-temporal-
occipital areas
- Not exclusively to sensory or motor info
o Higher mental processing
o Composed of regions that receive inputs from 1 or more modalities
o Reasoning
o Memory
Describe Herschel’s Gyrus.
Location
Damage =
Dorsal surface of superior temporal gyrus + buried within Sylvian fissure
- Primary auditory cortex + auditory association cortex
- Damage = pure word deafness (inability to understand words but preserved recognition of nonverbal sounds)
Describe the primary auditory cortex.
Location
Damage =?
Located on superior temporal gyrus
o Receives sound from acoustic nerve
o Damage = hearing loss (cortical deafness)
Describe Wernicke’s area.
Location?
Damage = ?
Located in posterior part of superior temporal gyrus in left hemisphere
o Critical to understanding written + oral language
o Encircles auditory cortex on Sylvian fissure = auditory language association
o Damage = impaired language comprehension, speech can be meaningless, but maintain natural rhythm + syntax
Describe the Primary somatosensory cortex.
Location?
Located in postcentral gyrus
o All modalities of somatic sensation are received here
o Primary sensory area that integrates + controls somatic sensory impulses