HLTA03H3 Lecture Notes - Lecture 2: Phineas Gage, Psycholinguistics, Millisecond
Document Summary
Plic55: psycholinguistics lec 02: language and the brain. Phineas gage: rare case of living person with reasonably localized brain damage. No longer able to plan, show self restraint (e. g. , use of profanity) --- described by f(cid:396)ie(cid:374)ds as (cid:862)no lo(cid:374)ge(cid:396) gage(cid:863) Measuring proxies of neural activity the case of fmri. Note that fmri in its simplest form tells you where the differentially greatest activity for a stimulus (relative to a baseline) occurs--- many other brain regions may be coactivated. Advantages - full brain coverage (cid:894)good at a(cid:374)s(cid:449)e(cid:396)i(cid:374)g (cid:862)(cid:449)he(cid:396)e(cid:863) questions) Weaknesses -blood flow changes are delayed and not very temporally precise (think of suddenly sprinting; takes a minute for respiratory system to catch up) Diffusion fmri neurons are like pipes, water flows within the pipe, but does not leak out much. We can track the big pipes in the brain by monitoring how water flows (diffuses).
