Language and the brain

Question 1

Wernicke-Geschwind Model

Answer 1

Assumes that language is almost exclusively left-hemisphere dominant
Frontal lobe and temporal lobe are more crucial for language
Frontal lobe areas
Temporal lobe areas
Arcuate Fasciculus

Question 2

Frontal Lobe areas

Answer 2

Broca’s Area - plans and organizes speech movements
Primary motor cortex - controls speech muscles
Broca’s Aphasia - motor movement/retrieval issue, slowed, halting speech, good comprehension, difficulty accessing words

Question 3

Temporal lobe areas

Answer 3

Wernicke’s area - storage and retrieval of words and meanings; grammatical rules
Primary auditory cortex - perception of auditory stimuli
Wernicke’s aphasia - large left hemisphere lesions, poor comprehension, grammatical correct, fluent but nonsensical

Question 4

Arcuate Fasciculus

Answer 4

connects Broca’s area and Wernicke’s area

Question 5

Duel stream model of language processing

Answer 5

Dorsal stream - map speech to articulatory representation; involved in verbal repetition; left hemisphere dominant
Ventral stream - map speech to meaning; involved in understanding speech, bilateral - left and right hemisphere

Question 6

How do the Wernicke-Geschwind and Dual stream model differ?

Answer 6

Wernicke-Geschwind Model - Left hemisphere only!

Duel stream model - bilateral!