Neurofunctional theory
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Transcript of Neurofunctional theory
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Neurofunctional Theory
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Language:A Left Hemisphere Function
(Hoff, 1997)
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Broca’s Area vs. Wernicke’s Area
Broca’s Area–Responsible for
the precise control of the mouth and larynx muscles–Seat of grammar,
comprehension, and production
Wernicke’s Area–Home of meaning
(Hoff, 1997 & Bardies, 1999)
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• Condition in which language functions are severely impaired
(Hoff, 1997)
Aphasia
Carl Wernicke Paul Broca
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Broca’s Aphasiaor
Wernicke’s Aphasia
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Broca’s or Agrammatic Aphasia
• Difficulty speaking–Lacks grammatical structure–Has no understanding of expression–Has short strings of content words
• Difficulty comprehending(Hoff, 1997)
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http://itre.cis.upenn.edu/~myl/languagelog/archives/005401.html
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Wernicke’s or Paragrammatic Aphasia
• No difficulty speaking–Speech has no sense–Use meaningless words–Speech is syntactically full but
semantically empty• Great difficulty comprehending
(Bardies, 1999; Ekiert 2003; Hoff, 1997)
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tumblr_lyu7xjnO5d1qcz3vdo1_500.jpg&w=417&h=750&ei=KTUgUc_mK8SOrgeLo4DIBQ&zoom=1&ved=1t:3588,r:34,s:100,i:106&iact=rc&dur=511&sig=103095329080267584863&page=9&tbnh=196&tbnw=109&ndsp=17&tx=56&ty=54
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Brain Lateralization
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Brain Lateralization
Experiment:Experienced Musicians – Right Ear (LH) Naive Listeners – Left Ear (RH)
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Brain LateralizationLeft Hemisphere (LH) • Detailed Processing
of Structured Sequence
• Syntax and Phonology
Right Hemisphere (RH)• Holistic processing• Semantics and
pragmatic aspects• Visual-spatial tasks
(Hoff, 1997)
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Which matures first? RH or LH• Babies– are attentive to
intonation– vocalize prosodic
contours before they articulate
– produce isolated syllables before sequence of syllables
– phonology and syntax come later
(Bardies, 1999 & Hoff, 1997)
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ResultsofExperiments
(Hoff, 1997)
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The Signers
• LH damage resulted in aphasia for signers just as it does for users of a spoken language
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Split-Brain Patients• Corpus Callosum• No communication between 2 hemispheres
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http://www-rohan.sdsu.edu/~gawron/intro/course_core/lectures/aphasia_cases_slides.html
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Undamaged Adult
• Use dichotic listening experimentResult: 1. It shows a right ear advantage– Due to the position of LH• LH is the locus of language ability
2. Speech sound travels to LH (RE)3. Musical sound travels to RH (LE)
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Equipotentiality Hypothesisvs. Invariance Hypothesis
(Hoff, 1997)
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Equipotentiality Hypothesis• Proponents: Bishop and Lenneberg• LH is not specialized for language at
birth• LH and RH have equal potential for
acquiring language• Language shifts to the left only with
maturity(Kennedy, 1997)
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Equipotentiality Hypothesis
Evidences1. Infants’ Brains and Language
Magnets2. Dichotic Listening Results3. Recovery from Aphasia4. Brain Plasticity
(Kennedy, 1997)
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Invariance Hypothesis
• Proponents: Kinsbourne, Satz & Lewis, Satz, and Witelson
• LH has the adult specialization for language at birth
• Nothing about lateralization changes in development
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What happens when the LH/RH is damaged prior to
language acquisition?
(Hoff, 1997)
1. Delay2. Catch up3. Subtle impairments
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The Bilingual Brainby Monika Ekiert
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Results and Implications• Different cerebral networks support L1
and L2 acquisition• Patient’s performance varies among
languages• Presence of Differential Aphasia• Anatomical separation of grammar and
phonology vary to the age and manner of language acquisition
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Early vs. Late Bilinguals
• Early–No distinct regions for different languages
• Late–Grammar and phonology are in close
proximity– L2 develop separately as if L1 is already
fully connected
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Dual-language Environment
• Early and late SLA resulted in a LH localization of the L2. • Children = Recruitment of new
connection• Adult = Creation of Connection
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Limitations of the Study
• Brain imaging studies show lack of differences between cerebral activation and behavioral data
• No study for novel sentence production• No method of control to measure
proficiency of participants
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Implications of Neuroscience for Educational Reform
(Kennedy, 1997)
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1. TRUE OR FALSE
• Brain of a 2-year old has twice as many synapses or connections as an adult’s brain.
TRUE• Learning experiences determine which
brain connections become developed and which will no longer function.
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2. TRUE OR FALSE• There is a neurological time frame for learning
features of L2.TRUE
• Accents are established by 6 months.• Window for acquiring syntax closes at 5-6.• Window for allowing new words may never
close. • Learning an L2 become steady then decline
after 6.
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• Beginning language learners should be taught a new language in a different way than they acquired their first.
(Kennedy, 1997)
3. TRUE OR FALSE
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FALSE
1. Ingredients of L2 learning:–Encouragement and Natural
Environment–Observing, Listening,
Understanding, Speaking, Reading, and Writing
2. Use ultradian rhythms in the class.(Kennedy, 1997)
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4. TRUE OR FALSE
• The required time in L2 learning depends on the language being learned.
TRUE• Thousands of hours – Spanish and
French• 4-5 times longer – Arabic, Japanese,
Korean, Mandarin, and Russian
(Kennedy, 1997)
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5. TRUE OR FALSE• Words should be heard 20-30 times before
it stays in the long term memory. FALSE
• 40-80 times• Vocabulary: “Hear and Say” before “Write”• Avoid lengthy word list. • Visual imagery elicits memory retrieval.
END.(Kennedy, 1997)
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References
Bardies, B. d. (1999). The Infant Does Not Talk, But.... How language comes to children: from birth to two years (pp. 29-35). Cambridge, Mass.: MIT Press.
Ekiert, M. (2003). The Bilingual Brain. WP TESOL/AL, 3, 1-8. Retrieved February 17, 2013, from http://journals.tc-library.org/index.php/tesol/article/view/31/
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References
Hoff, E. (1997). Biological Bases of Language Development Language development (pp. 388-405). Brooks Cole Pub.: Pacific Grove CA.
http://itre.cis.upenn.edu/~myl/languagelog/archives/005401.html
https://www.google.com.ph/imghp?hl=fil&tab=wi
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References
http://www.google.com.ph/imgres?start=122&um=1&hl=fil&tbo=d&biw=1241&bih=567&tbm=isch&tbnid=1HN9r4LLOG8SeM:&imgrefurl=http://www.tumblr.com/tagged/broca%27s%2520aphasia&docid=e-LicVRyNZr5eM&imgurl=http://25.media.tumblr.com/tumblr_lyu7xjnO5d1qcz3vdo1_500.jpg&w=417&h=750&ei=KTUgUc_mK8SOrgeLo4DIBQ&zoom=1&ved=1t:3588,r:34,s:100,i:106&iact=rc&dur=511&sig=103095329080267584863&page=9&tbnh=196&tbnw=109&ndsp=17&tx=56&ty=54
http://www-rohan.sdsu.edu/~gawron/intro/course_core/lectures/aphasia_cases_slides.html
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References
Kennedy, T. J. (2006). Language Learning and Its Impact on the Brain: Connecting Language Learning with the Mind Through Content-Based Instruction. Foreign Language Annals, 39(3), 471-486.
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