Series of observations/responses, categories into clustered relating to latent variable or component, examine joint variation across items and establish relationship
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What is PCA useful for?
Data reduction
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What does it determine?
Which variables or observations fit most with the components
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What should the number of components be?
Should be less than the original number of observations and account for high proportions of ariance
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What is the structural evidence for extraversion?
Cortical thickness in lateral pre frontal cortex, even after controlling for age and sex --> Same in fushiform cortex
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What is extraversion linked to?
Reward processing centres
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Increased volume in what?
Medial OFC, which has been linked to approach behaviours
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What has neurotocism been linked to?
Cortical thickness in orbito-frontal cortex, even after controlling for age and sex
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What else has neuroticism been linked to?
Threat processing, decreased volume in right dorsal-medial PFC and prosterior hippocampus, potions of basal ganglia and midbrain, increased volume of mid cingulate cortex extending into white matter of singular gyrus
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