PSYC 251 Lecture Notes - Lecture 20: Thalamus, Peripheral Nervous System, Striatum
22 Jun 2018
School
Department
Course
Professor
fMRI
"functional Magnetic Resonance Imaging"
Measures changes in magnetization, using electromagnetic radiation and nuclear
magnetic resonance
neural activity -> increased blood flow -> change in magnetic field -> fMRI BOLD signal
(Blood Oxygenation Level Dependent)
Very good spatial resoultion (milimeters)
Ok temporal resolution (seconds)
Non-invasive
Low risk
o Very high (1-5 Tesla)
o Risks influence flying unsecured metalic objects, shifting internal metallic objects
Neural Basis of Meaning
Study: (Mitchell et al. 2008)
o Are relationships between concepts basic neural building blocks of meaning?
find verdbs that co-occur with nouns based on text analysis
determine brain activation for each verb
predict ativation for nouns as summation activation for related verbs
test predicitons
o Conclusion
concepts ar erepresented by highly distributed patterns of activation across
the brain
Perceptual and motor brain areas involved in representing meaning
The association between concepts (as measured by co-ocurrence of words) can
be used to predict brain activation of those concepts
Ch.8 Emotion
Descartess Error (Demasio 1994)
A patient with intact cognition but impaired ability to use emotions to guide decision
making, due to ventromedial prefrontal cortex damage
P was able to think through rationally and logically, but laking sense of value (caring) in
order to pick one possibility
Emotion
Problem
o how do we know what matters?
Importance
o It is one thing to experience perceptions, recall memories, and perform actions, its
uite another to know how we feel about ttheos perceptions, memories, and actions
Challenge
Document Summary
Measures changes in magnetization, using electromagnetic radiation and nuclear magnetic resonance. Neural activity -> increased blood flow -> change in magnetic field -> fmri bold signal (blood oxygenation level dependent) Low risk: very high (1-5 tesla, risks influence flying unsecured metalic objects, shifting internal metallic objects. 2008: are relationships between concepts basic neural building blocks of meaning? find verdbs that co-occur with nouns based on text analysis. Predict ativation for nouns as summation activation for related verbs test predicitons: conclusion concepts ar erepresented by highly distributed patterns of activation across the brain. Perceptual and motor brain areas involved in representing meaning. The association between concepts (as measured by co-ocurrence of words) can be used to predict brain activation of those concepts. A patient with intact cognition but impaired ability to use emotions to guide decision making, due to ventromedial prefrontal cortex damage.
