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Ch13. Biological Foundations of Language

Ch13. Biological Foundations of Language. David W. Carroll Psychology of Language, 5 th edition. Index. Introduction Brain Mechanisms and Language Lateralization of Language Processes Evolution of Language. Introduction. Language processes from a biological viewpoint

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Ch13. Biological Foundations of Language

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  1. Ch13. Biological Foundationsof Language David W. Carroll Psychology of Language, 5th edition

  2. Index • Introduction • Brain Mechanisms and Language • Lateralization of Language Processes • Evolution of Language

  3. Introduction • Language processes from a biological viewpoint • Two reasons to know about biology of language • Previous discussion • comprehension & production • Further discussion • Acquisition • Three sections • Brain Damage related to language • Nature of hemisphere difference • Evolutionary human language

  4. What is Language? • Language is thought to be a mechanism for transmitting the information within thoughts. • One experiment used to demonstrate this idea requires subjects to listen to a short passage of several sentences. The subjects are then asked to repeat the passage. Most subjects accurately convey the gist of the passage in the sentences they produce, but they do not come close to repeating the sentences verbatim. It appears as if two transformations have occurred. Upon hearing the passage, the subjects convert the language of the passage into a more abstract representation of its meaning, which is more easily stored within memory. In order to recreate the passage, the subject recalls this representation and converts its meaning back into language. http://www.brainconnection.com/topics/?main=fa/evolution-language6

  5. Brain Mechanisms and Language

  6. Wernicke’s Area Broca’s Area

  7. Superolateral Surface of brain

  8. Insula

  9. Medial surface of Brain

  10. Bottom surface of Brain

  11. Geschwind’s Model (1/2)

  12. Geschwind’s Model (2/2)

  13. Major Aphasic Syndromes

  14. Some example • syntactic deficit • It was the girl who chased the boy. (o) • It was the boy whom the girl chased. (x) • Ambiguous sentence • The experienced soldiers warned about the dangers before the midnight raid. (easy) • The experienced soldiers warned about the dangers conducted the midnight raid. (hard)

  15. Dapretto & Bookheimer (1999).

  16. IFG activation • Syntactic • Semantic • Phonologic tasks • coordination

  17. IFG activation plot

  18. Lateralization of Language Process

  19. Optic pathway

  20. Auditory pathway • Ipsalateral pathway • Contralateral pathway • Corpus callosum • Ipsalateral < Contralateral

  21. Lateralization of brain ? Bever (1980) left hemi – relational processing right hemi – holistic processing

  22. Picture – sentences matching test in split-brain condition • Subject-Object • The boy kisses the girl. • The girl kisses the girl. • Tense • The girl is drinking. • The girl will drink. • Plural noun • The dog jumps over the fence. • The dogs jump over the fence.

  23. Experienced Musician • Bever and Chiarello (1974) • On musical task (non-speech task) • Right-ear advantages for the experienced • No left-ear advantages

  24. Right-hemisphere damage • Kaplan and colleagues • Difficulty integrating information about performance with information about character’s relationship.

  25. Lexical task • Word in left visual field • Dominant meaning is immediately facilitated, but not for subordinated meaning. • Particular meaning • Word in left visual field • Dominant meaning is facilitated immediately, but inappropriate meaning is not suppressed. • Alternative meaning Burgess and Simpson (1988) Chiarello (1991)

  26. Cortical Activation during Semantic processing

  27. Evolution of Language

  28. Language evolution and the arcuate fasciculus • Figure from the News and Views summary by Ghazanfar - Chimpanzees are phylogenetically between macaques and humans in the primate lineage, and the similarly 'in between' pattern of their arcuate pathway terminations strongly suggest a gradual evolution of this pathway.(a) Changing patterns of connections between frontal cortical areas and the temporal lobe in humans, chimpanzees and macaque monkeys. AS, arcuate sulcus; CS, central sulcus; IFS, inferior frontal sulcus; IPS, intraparietal sulcus; PS, principal sulcus; PrCS, precentral sulcus; STS, superior temporal sulcus. (b) The voice area in the rhesus macaque relative to other auditory cortical areas and where the voice area would be if it were in a similar location as the human voice area. LS, lateral sulcus; IOS, inferior occipital sulcus; STS, superior temporal sulcus; other labels refer to cytoarchitectonic areal designations. The lateral sulcus is cut open to reveal the superior temporal plane. In this plane, the core region is thought to contain 'primary-like' areas, responding best to pure tones, whereas the surrounding belt areas are more responsive to complex sounds. The voice area in macaques is anterior to the core and belt regions. INS, insula; IT, inferotemporal cortex; Tpt, temporoparietal area. http://mindblog.dericbownds.net/2008/04/language-evolution-and-arcuate.html

  29. Comparison of the supralaryngeal vocal tracts in a new born infant, Neanderthal, and an adult human

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