PSYCH 454 Lecture Notes - Lecture 25: Premotor Cortex, Angular Gyrus, Paraphasia
24 May 2018
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Lecture 25: Beyond Understanding Part 2 - Neural Basis of Language
Important Brain Areas for the Language Network in Left Hemisphere
●Wernicke’s area
●Broca Areas
●Motor control of mouth and lips/Motor cortex
●Angular gyrus
●Auditory cortex
Anatomical Connections between Cortical Language Areas
●In dual stream models:
○Dorsal pathways: support auditory-motor integration (ex: mapping sound to
articulation/vocalization
); connects with premotor cortex and Broca’s area
■Dorsal pathway 1: pSTG → premotor cortex via AF/SLF
■Dorsal pathway 2: pSTG → BA 44 (brocas) via AF/SLF
○Ventral pathways: support sound to meaning mapping
(speech to meaning of it)
■Ventral path 1:STG → Brocas, BA 45 via EFCS
■Ventral path 2: Ant STG → FOP via UF
●AF = arcuate fasciculus, SLF = superior longitudinal fasciculus, EFCS = extreme fiber capsule, UF = uncinate fasciculus, Stg- superior
temporal gyrus
Brain Lesions leading to language and speech Deficits
●Focused on broca’s and wernicke's
○Broca's: lesion of motor association cortex of frontal lobe→ can still
understand/comprehend what someone is saying, but unable to vocalize →
speech won't be fluent
■Difficulty with repetition, show paraphasic error
○Wernicke’s: lesions to posterior temporal lobe → issue comprehending what
someone else is saying
Document Summary
Lecture 25: beyond understanding part 2 - neural basis of language. Important brain areas for the language network in left hemisphere. Motor control of mouth and lips/motor cortex. Dorsal pathways: support auditory-motor integration (ex: mapping sound to articulation/vocalization ); connects with premotor cortex and broca"s area. Dorsal pathway 1: pstg premotor cortex via af/slf. Dorsal pathway 2: pstg ba 44 (brocas) via af/slf. Ventral pathways : support sound to meaning mapping (speech to meaning of it) Ventral path 1:stg brocas, ba 45 via efcs. Ventral path 2: ant stg fop via uf. Af = arcuate fasciculus, slf = superior longitudinal fasciculus, efcs = extreme fiber capsule, uf = uncinate fasciculus, stg- superior temporal gyrus. Brain lesions leading to language and speech deficits. Broca"s: lesion of motor association cortex of frontal lobe can still understand/comprehend what someone is saying, but unable to vocalize speech won"t be fluent. Wernicke"s : lesions to posterior temporal lobe issue comprehending what someone else is saying.
