cognition part 2 Flashcards
Stroke in Hippocampus and/or Amygdala
• Decreased emotional responses
Decreased responsiveness, aggression, fear, dominance and social interest
All neural roads lead to the
frontal lobes”
Frontal Lobe; All cortical tissue anterior to
central sulcus

motor • premotor • prefrontal
functional distinct regions of frontal lobe
Motor Movements Speech Production
Frontlal Lobe
Planning Organizing Problem solving
Frontal Lobe
Personality Behavior Emotions
Frontal Lobe
Selective attention
Frontal Lobe
• Primary motor cortex
Controls contralateral side of body • ‘motor homunculus’ •
Primary motor cortex
voluntary, skilled movements
• Premotor cortex
• sequencing, timing, and initiation of voluntary movements
Brocha’s area of Frontal Lobe
speech production
Motor and pre-motor cortices of frontal lobe
direct control of movements through projections to spinal motor neurons and cranial nerve motor neurons
Motor and pre-motor cortices of frontal lobe
also projects to basal ganglia
lesion to Broca’s Aphasia
Inability to speak fluently
Non-fluent speech
Few words, short sentences, many pauses
lesion to
Broca’s Aphasia
Words produced with effort and sound distorted • Repetition is impaired
lesion to Broca’s Aphasia
Repetition is impaired •
Comprehension is relatively intact • Awareness of mistakes
Prefrontal Cortex: Executive Functions of Frontal Lobe
effective and efficient goal-directed behavior; organization of behavior & cognition
Prefrontal Cortex of Frontal Lobe
Initiating - Inhibiting and Judgment
- Planning and organizing
and problem solving
Prefrontal Cortex
Selective attention
- Self-monitoring
Prefrontal Cortex
Abstract thinking and mental flexibility
Prefrontal Cortex:
frontal lobe lesion
Short-term memory impairment
• Loss of flexible thinking
Poor response inhibition
Damage to the Frontal Lobe
Inappropriate social & sexual behavior
Damage to the Frontal Lobe
Impaired judgment, abstract thinking, hypothesis testing and planning
Damage to the Frontal Lobe
• Difficulties using cues and information from the environment to direct, control, or change behavior
Damage to the Frontal Lobe
Occiptal lobe Separated from parietal and temporal lobes
by parieto-occiptal sulcus
Primary visual cortex is Brodmann area 17,
Occipital lobe
Posterior pole of cerebral hemispheres
Occipital Lobe
Dorsal stream of occipital lobe
visual information to posterior parietal cortex
Dorsal stream of occipital lobe
“where”
Ventral stream of occipital lobe
visual information to inferotemporal cortex
Ventral stream of occipital lobe
what
Can only perceive movement through a compilation of still images as if watching the world through a strobe light
Akinetopsia
Akinetopsia
inability to perceive motion
brain damage disrupting input to the dorsal pathway (V5/MT).
Akinetopsia
Occipital Lobe Dysfunction
Visual agnosia, Prosopagnosia,Akinetopsia
inability recognize an object
Visual agnosia
Prosopagnosia
inability to recognize faces including their own
Agnosia?
• Inability of the brain to process or make use of sensory stimuli
Sensory perception of the stimulus is disconnected from memories associated with the stimulus
Agnosia
strokes, dementia, carbon monoxide poisoning cause
Agnosia
agnosia not same as
blind or deaf
Auditory Agnosia
Inability to recognize sounds
Inability to perceive objects through tactile stimulation
Somatosensory Agnosia
Difficultly recognizing objects, faces and words
Visual agnosia
occipital disfunction
Cannot sort pictures or objects into categories and – Cannot name objects
Visual agnosia
Visual agnosia
Prosopagnosia
Akinetopsia
Occipital Lobe Dysfunction
Prosopagnosia
Severe disturbance in the ability to recognize faces
Lesions of inferior and medial occipital lobe
Prosopagnosia
Recognition of facial parts is intact
Prosopagnosia
Prosopagnosia
• Accurate judgments about gender, age and emotion are still intact and can recall detailed information about a specific individual
Language is
any system for representing and communicating ideas
speech
particular audible manner of communicating language
Broca’s area –
production of area
Wernicke’s area –
Comprehension of language
Wernicke-Geschwind Model
Neural Basis of Language
Wernicke-Geschwind Model
Comprehension – Production – Reading
When we listen to speech, words are send via pathways to primary auditory cortex (Heschl’s gyrus);
relayed to Wernicke’s area(Comprehension)
Broca’s area
holds representations for articulating words –
broca’s area(language production)
Instructions are sent to facial area of motor cortex -> facial motor neurons in brain stem
Reading;Information is sent to visual areas 17, 18 and 19
– Goes to angular gyrus -> Wernicke’s area
Wada Test
Sodium amytal, an anesthetic, is injected into the right or left carotid artery
Wada test
If the left hemisphere is put to sleep in people who have language ability in the left hemisphere
person cannot speak
if right hemisphere is put to sleep, then will be able to speak
with anestiic in left hemisphere
person can still talk
Identifying Language Areas;
Electrical stimulation of the cerebral cortex on left side
left side dominance language will be disrupted with electrode stimulation