Exam - Ch.8 notes - Anatomy and physiology of personality Ppl always suspect-> brain = sig for mind and behaviour Hippocrates(greek physician-> emotions

Exam - Ch.8 notes - Anatomy and physiology of personality...

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Anatomy and physiology of personality: Ppl always suspect -> brain = sig for mind and behaviour Hippocrates (greek physician) -> emotions, wt we think, see, hear and standards r from the brain, Colin Deyoung -> all personality differences are biological o Proximally generated by brain regardless originated in genes or environment BUT HOW to understand brain's functions knowing it is important? At first, no useful tool; only look at ppl w/ damages, lesion/ died More recently-> EEG, PET scan, fMRI maget o Tell us abt the activity of living, intact brain o Can look at anatomy and biochemistry of the brain at the same time Anatomy: function of parts of brain, timing, physical location of brain processes Biochemistry: NT, hormones ->effect on brain, where and when secrete/respond What can the structure of the brain tell us abt personality? To what degree is personality a matter of chemistry? Implication: to cure mental illness, improve quality of life w/ drugs Brain and personality: Physical basis of personality -> brain and nerves Afferent neuron -> extremely long dendrites -> receive potential from part of body to brain Efferent neuron -> extremely long axon -> send signal from brain Biggest interneuron bundle -> brain Thalamus: regulate arousal Hypothalamus -> hormones Amygdala->emotion Hippocampus -> memory ^inner organ in brain Wrapped around o Outer layer -> cortex o 6 layers Outermost - neocortex Frontal cortex -> 2 lobes Human cognition, plan, emotional experience -> empathy, moral reasoning Uniquely human functions Research methods for studying the brain: 1 Brain damage: Look at the specific problems created by a certain damage Sometimes-> brain r damaged deliberately -> lesion o On animals -> rats, dogs, o Ok bc mammal brains look and function alike o Also can look at animal personality -> chimpz, dogs, tortoises, even squid
1 Brain stimulation: Difficult and rare o Stimulate brain part directly w/ electrodes and see response Done on animals Penfield: brain surgery on conscious patients o Electrically stimulate parts in the brain o Ask for patients' experience Different kinds of flashbacks Recent-> o Stimulate the left substantia nigra of a paktinson patient Symptoms of depression Lasting? No after stimulation was off -> 90 sec Depression symptom disappear Cheerful, laughing, joking Substantia nigra: Dopamine, serotonin, norepineephrine Nt involved in depression TMS: o Use rapidly changing magnetic field -> turn off areas of brain activity Create a virtual lesion See wts the role of tht part in psychological task Speech area -> turned off -> cant talk temporary tDCS related technique: o Right frontal lobe Important -> deciding whether to punish a unfair game player/ to play fairly 1 Brain activity and imaging: Observe brains function directly EEG: o Put electrodes on scalp to look at electrical signals in the brain MEG: o Magnetoencephalography o

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