The Brain. The Big Questions What do different parts of the brain do, and how do they work together?  Information flows through neighborhoods..  Different.

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Presentation transcript:

The Brain

The Big Questions What do different parts of the brain do, and how do they work together?  Information flows through neighborhoods..  Different kinds of learning

Gross Anatomy 3

We are Corticocentric.. Cerebral Cortex (Neocortex) is where most of the good stuff happens: cognition, intelligence, knowledge, memory, consciousness, … Hippocampus (archicortex), Amygdala, Basal Ganglia, Thalamus all interact extensively with neocortex, form tightly integrated subsystems (Limbic system is not super useful construct). Lots of more specialized brain areas in subcortex, but seriously, who cares..

Lobular Functions: Follow the trail.. 5

Visual Hierarchy: What vs Where 7

“Van Essen” Hierarchy TE.. = Temporal LIP, DP.. = Parietal 8L = Frontal Eye Field To hippocampus: TH/F = Parahippo peri = Perirhinal 8 Markov et al., 2014

Hierarchy of Detectors (CCCC = Compression: abstract, simplify) 9 Inferior Temporal (IT) cortex has high-level abstractions that are relevant to your life! It takes a village of neurons to build up these abstractions.

Cortical Organization Summary Occipital Lobe: vision Temporal Lobe: object & face recognition, audition, speech, language, semantics Parietal Lobe: space, number, action, somatosensory Frontal Lobe: (motor) Control (executive), emotion, motivation Left / right: not too popular in science now..

Rest of Brain Hippocampus (archicortex – old cortex): episodic memories (events, facts, this lecture..) Amygdala: emotions (reward, fear, etc): major controller of dopamine Basal Ganglia: motor / cognitive initiation based on what has worked in the past (dopamine) Thalamus: mini-me to cortex, interacts with BG Cerebellum: tunes up fine motor control

Brain Damage Anyone? I know someone who has had a stroke or other damage to neocortex: A. Nope B. Occipital – visual impairments C. Temporal – visual, language, semantic knowledge impairments D. Parietal – spatial neglect, motor control E. Frontal – behavioral, motor, speech output..

Subcortical Damage I know someone who has some form of disorder or damage to subcortical brain areas: A. Basal Ganglia – Parkinson’s, Huntington’s B. Hippocampus – Alzheimers, epillepsy C. Cerebellum – motor control (ataxic cerebral palsy) D. Thalamus – Korsakoff’s syndrome (alcohol) E. Other (amygdala, pituitary, thyroid..)

Learning Rules Across the Brain 14 + = has to some extent … +++ = defining characteristic – definitely has - = not likely to have … = definitely does not have Learning Signal

Memory and the Hippocampus 15 Memory is based on highly Compressed (CCCC) summary of cortex – we don’t remember actual details very well!

Basal Ganglia: Motor Initiation 16 Dopamine shapes selection of most rewarding (least punishing) action plan

Cerebellar Error-driven Learning Cerebellum = Support Vector Machine Granule cells = high-dimensional encoding (separation) Purkinje/Olive = delta-rule error-driven learning Classic ideas from Marr (1969) & Albus (1971) 17

Language = Whole Brain! Language and higher-level cognition builds on already-learned sensory / motor pathways 18

Frontal Executive: Top-Down Biasing CCCC = Control! PFC active maintenance provides top-down biasing of posterior-cortical processing

Medial Frontal Map of Values This is your emotional life 20