Neurobiology Flashcards
(10 cards)
What is the methodology of MEG?
- Records magnetic fields generated by brain activity
- Good spatial resolution and excellent
- temporal resolution (can capture rapidly changing brain activity)
What is FMRI
- measures the small changes in blood flow that occur with brain activity
- Non invasive
- Low temporal resolution
What is speech?
- Actual sound of spoken language
- Oral form of communicating
- Includes Articulation , voice and fluency
What are the main mechanisms of language
Grammar, morphology, syntax, phonology, phonetics, semantics etc
How is speech rhythmic
Speech has a hierarchically organised rhythmic structure which matches the hierarchy in brain
How is speech rhythmic in reference to syllables?
Syllable = a unit of pronunciation having one vowel sound
Speech intelligibility critically depends on syllable rate
How do you track speech
Using MEG or EEG we can study the synchronisation between speakers speech rhythms and listener brain oscillations
Auditory speech rhythms modulated by intelligibility (the quality of being able to be understood)
Describe frequency in reference to speech tracking
- Low frequency brain oscillations (delta & theta) in auditory context track on intelligible speech (story condition) but not unintelligible speech (back condition)
- Low frequency speech tracking is more right lateralized
- High frequency (gamma) speech tracking is more left lateralized
How is communication a joint action?
Requires mutual understanding: when different minds mutually infer they agree on an understanding
- Production and comprehension of communicative behaviours supported by right laterised frontal temporal network (necessary for conversational context)
Whats Broca’s aphasia and Wernicke’s aphasia?
Broca’s aphasia (production):
Wernicke’s aphasia (comprehension):
located in the left hemisphere of the brain
