Geography of the Forehead
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- Evelyn Gilbert
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1 5. Brain Areas
2 Geography of the Forehead Everyone thinks the brain is so complicated, but let s look at the facts. The frontal lobe, for example, is located in the front! And the temporal lobe is where the clock is. What could be simpler? The hippocampal fissure is where big, dumb thoughts camp, while at the Fissure of Rolando dark-skinned men with one gold earring lie around the fire and play guitars. The superior frontal convolution is where a lot of really nice houses are set back off a twisty road, while the inferior frontal convolution is a kind of trailer park, regularly leveled by brainstorms. The area of Broca is pretty much off limits. And if you know Broca, you know why. Geography of the Forehead by Ron Koertge from Geography of the Forehead. The University of Arkansas Press, /8/18 COSC 494/594 CCN 2
3 Outline A. Functional Anatomy of the Brain B. Perception and Attention C. Motor Control D. Learning and Memory E. Language F. Executive Function 2/8/18 COSC 494/594 CCN 3
4 A. Functional Anatomy of the Brain Comparing and Contrasting Major Brain Areas 2/8/18 COSC 494/594 CCN 4
5 2/8/18 COSC 494/594 CCN 5 (fig. from internet)
6 Other (Subcortical) Areas l l l l l l Hippocampus: Thalamus: Amygdala: Basal Ganglia: Cerebellum: Reward prediction system: rapid learning sensory input, attention emotion, fear/desire motor control, gating of PFC coordinating movements dopamine release 2/8/18 COSC 494/594 CCN 6 (slide < O Reilly)
7 anterior inferior 2/8/18 Subcortical Areas COSC 494/594 CCN 7
8 Interactive Images Atlas of Brain Injury and Anatomy Brain Anatomy (Koshland Science Museum) 2/8/18 COSC 494/594 CCN 8
9 Left Hemisphere 2/8/18 COSC 494/594 CCN 9
10 Intercortical Connections (1) Short arcuate bundles, (2) Superior longitudinal fasciculus, (3) External capsule, (4) Inferior occipitofrontal fasciculus, (5) Uncinate fasciculus, (6) Sagittal stratum, (7) Inferior longitudinal fasciculus 2/8/18 COSC 494/594 CCN 10
11 Intercortical Connections (diffusion spectrum imaging) 2/8/18 COSC 494/594 CCN 11 Published by AAAS G. Miller Science 330, 164 (2010) (2010)
12 Brodmann s Areas 2/8/18 COSC 494/594 CCN 12
13 General Functions of Cortical Lobes (how is this determined?) 2/8/18 COSC 494/594 CCN 13 (slide < O Reilly)
14 Motor Movements Motor Plan Plan Object Meaning Objects Shapes lines+colors Visual input Hierarchical Sequences of Transformations Motor 1 Frontal Supp. Motor Frontal PFC Frontal Ant. Pole Temporal Inferior Temporal V4 Occipital V1/V2 Occipital 2/8/18 COSC 494/594 CCN 14 (slide < O Reilly) Retina
15 Tripartite Cognitive Architecture 2/8/18 COSC 494/594 CCN 15 (slide < O Reilly)
16 Large Scale Distributed Organizations Knowledge is distributed across multiple brain areas Multiple areas participate in representing a given thing (e.g., apple) Each area represents multiple things Same idea as distributed representation among units for individual items, but in this case across multiple areas/modalities, etc. 2/8/18 COSC 494/594 CCN 16 (slide based on Frank)
17 Learning Across the Brain Learning Signal Dynamics Area Reward Error Self Org Separator Integrator Attractor Basal Ganglia Cerebellum Hippocampus Neocortex /8/18 COSC 494/594 CCN 17
18 B. Perception and Attention What versus Where 2/8/18 COSC 494/594 CCN 18
19 Hierarchy of Visual Detectors 2/8/18 COSC 494/594 CCN 19
20 Macaque Visual System 2/8/18 COSC 494/594 CCN 20 (fig. from Clark, Being There, 1997)
21 Hierarchy of Macaque Visual Areas 2/8/18 COSC 494/594 CCN 21 (fig. from Van Essen & al. 1992)
22 What vs. Where Pathways What ignores differences in location, illumination, size, rotation Where emphasizes location, size, and ignores object identity 2/8/18 COSC 494/594 CCN 22
23 Multiple Interacting Pathways Maintaining Abstract Information (plans, sensory info, etc) Movement Spatial Processing Touch Visual Object Recognition Audition Abstract Semantics 2/8/18 COSC 494/594 CCN 23 (slide < O Reilly) Early Vision
24 Principal Regions in What Pathway Occipital Lobe V1: Primary visual cortex encodes image in terms of oriented edges V2: Secondary visual cortex encodes in terms of intersections & junctions V4: Third cortical area in ventral stream Temporal Lobe PIT: Posterior inferotemporal (IT) cortex location & size invariant object recognition includes FFA (fusiform face area) AIT: Anterior IT cortex abstract/semantic visual information more complex features over wider range of locations modulation by attention 2/8/18 COSC 494/594 CCN 24
25 C. Motor Control Parietal and Motor Cortex Interacting with Basal Ganglia and Cerebellum 2/8/18 COSC 494/594 CCN 25
26 Motor Control Motor cortex (frontal to parietal) high-level metrical processing of sensory information, integrating multiple modalities and translating between different reference frames arrives at a range of possible responses to the current sensory environment Basal ganglia action selection: receives sensory inputs and potential responses being considered in frontal cortex; triggers disinhibitory signal enabling best action action selection is shaped by reinforcement learning driven by dopamine signal amygdala plays key role in driving these dopamine signals in response to sensory cues associated with reward and punishment Cerebellum uses error-driven learning to acquire high-resolution metrical maps between sensory inputs and motor outputs 2/8/18 COSC 494/594 CCN 26
27 Somatosensory & Motor Homunculi 2/8/18 COSC 494/594 CCN 27
28 Reorganization of Cortex Median nerve sectioned to show fluidity of cortical organization (C) before (D) immediately after (E) several months later 2/8/18 COSC 494/594 CCN 28 (fig. < McClelland & al, Par. Distr. Proc. II)
29 D. Learning and Memory Temporal Cortex and the Hippocampus 2/8/18 COSC 494/594 CCN 29
30 Computational Trade-offs in Learning & Memory Computational objectives that are mutually incompatible and thus cannot be achieved by a single brain system Learning must be slow to capture statistical structure (averaging) But you have to be able to learn rapidly too Tradeoff solved by two systems: cortex learns slowly hippocampus learns rapidly Third system: active memory (prefrontal cortex) fastest (immediately accessible) 2/8/18 COSC 494/594 CCN 30 (slide < Frank)
31 Tripartite Functional Organization HC PC FC PC = posterior perceptual cortex: slow integrative learning HC = hippocampus and related structures: rapid memorization FC = prefrontal cortex: active maintenance ( working memory ) Defined by set of functional trade-offs. 2/8/18 COSC 494/594 CCN 31 (slide < Frank)
32 Hippocampal Memory Formation extremely sparse representations pattern separation 2/8/18 COSC 494/594 CCN 32
33 E. Language 2/8/18 COSC 494/594 CCN 33
34 Language Involves many of the foregoing functions perception, memory, executive function, motor control Models (ch. 9) will address: small scale model of reading, incorporating orthographic, phonological, and semantic aspects regular behavior without rules self-organization of semantic representations interaction of syntax and semantics 2/8/18 COSC 494/594 CCN 34
35 Distributed Representation of Words 2/8/18 COSC 494/594 CCN 35
36 F. Executive Function Prefrontal Cortex and Basal Ganglia 2/8/18 COSC 494/594 CCN 36
37 Executive Function Builds on motor control functions of frontal cortex (FC) and basal ganglia (BG) Areas of FC oriented to what vs. how processing hot emotional vs. cold cognitive processing Prefrontal cortex (PFC) control over posterior cortex PFC and BG interact to implement dynamically gated working memory system 2/8/18 COSC 494/594 CCN 37
38 Ventral vs. Dorsal Organization of PFC 2/8/18 COSC 494/594 CCN 38
2 Summary of Part I: Basic Mechanisms. 4 Dedicated & Content-Specific
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