Hindbrain, Midbrain, Forebrain. Lecture 3
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1 Hindbrain, Midbrain, Forebrain Lecture 3 1
2 Phrenology An Early View of Functional Specialization In Vienna F.J. Gall ( ) J.K. Spurzheim ( ) In Scotland G. Combe ( ) In the United States O.S. Fowler ( ) L.N. Fowler ( ) N. Sizer ( ) 2
3 Traditional Phrenological Head New York Times 3
4 Brain Lesions Brain Insult, Injury, or Disease Broca s Area Patient H.M. Nonhuman Animals Surgery Electrical Current Temporary Lesions Cooling Spreading Depression 4
5 Electrical and Magnetic Stimulation Electrical Stimulation Reticular Formation Lesions (Nauta) Stimulation (Moruzzi & Magoun) Transcranial Magnetic Stimulation Striate Cortex of Occipital Lobe 5
6 Psychophysiology Autonomic Nervous System Electrocardiogram (EKG) Plethysmograph Electrodermal Response (EDR) Skin Conductance/Resistance Electromyogram (EMG) Central Nervous system Electroencephalogram (EEG) Event-Related Potentials (ERP) 6
7 Brain Imaging X-Ray Computed Tomography (CT, CAT) Magnetic Resonance Imaging (MRI) Radio Waves Positron Emission Tomography (PET) Glucose Functional MRI (fmri) Henry Wheeler Brain Imaging Center, UC Berkeley 7
8 PET Images by Prof. Hannah Damasio New York Times Magazine, 05/07/2000 Pleasant Thoughts Depressing Thoughts Anxious Thoughts Irritating Thoughts 8
9 Identifying Natural Objects From Patterns of fmri Activity Kay, Naselaris, Prenger, & Gallant (2008) Topographical Organization of Visual System 9
10 Accuracy of Identification Kay et al. (2008) Chance = 1/120 = 0.8% 13 Repeated Trials Subject 1: 92% 1000 Images: 82% Chance = 0.1% Subject 2: 72% Single-Trial Performance Subject 1: 51% Subject 2: 32% 10
11 Reconstructing Natural Images Naselaris, Prenger, Kay, Oliver, & Gallant (2009) 11
12 The Doctrine of Modularity Fodor (1983) Transducers Modules Central System(s) (Outputs) Domain-Specific Informational Encapsulation Hardwiring Innate Specification Automaticity Characteristic Development Characteristic Breakdown Fixed Neural Architecture 12
13 Functional Specialization Outside the Brain Afferent and Efferent Neurons, Nerves Interneurons, Ganglia, Nuclei Autonomic Nervous System Sympathetic and Parasympathetic Branches Somatic Nervous System Afferent and Efferent Cranial Nerves Afferent and Efferent Tracts in Spinal Nerves Afferent and Efferent Tracts in Spinal Cord 13
14 Excitatory and Inhibitory Neurotransmitters Amines Acetylcholine (Ach) Monoamines Catecholamines Epinephrine (Adrenaline) Norepinephrine (NA) Dopamine (DA) Serotonin (5-HT) Amino Acids Glutamate GABA Peptides Substance P Beta-Endorphin Corticotropin (ACTH) Oxytocin 14
15 Neurotransmitters and Brain Disease Myasthenia Gravis (Ach) Parkinson s disease (Dopamine, l-dopa) Chorea (Dopamine; Haloperidol) Huntington s Disease Gilles de la Tourette s Syndrome Schizophrenia Dopamine Hypothesis, Chlorpromazine Affective Disorder Serotonin Hypothesis, SSRIs 15
16 Functional Specialization in the Brainstem Hindbrain Medulla Oblongata (Myelencephalon) Pons Midbrain (Metencephalon) (Mesencephalon) Reticular Formation Cerebellum 16
17 Loss of Consciousness Coma Eyes Closed Unresponsive to Stimulation No Sleep-Wake Cycle Spared Vegetative Function Posterior Brain Stem Reticular Formation Periaqueductal Gray Parabrachial Nucleus Diencephalon (Bilateral) Thalamus, Hypothalamus 17
18 Persistent Vegetative State Jennett & Plum (1972) Follows Coma Within 1 month Wakefulness Without Consciousness Eyes Open Apparently Vigilant Some reflex functions Normal Sleep Cycle Unresponsive to Stimulation Spared Vegetative Function Minimally Conscious State 18
19 Locked-In Syndrome Follows Coma Largely Immobile Limited Responsiveness Vertical Eye Movements Blinking Anterior Brain Stem Pons Excludes Reticular Formation Above Trigeminal Nerve (V) Oculomotor Nerve (III) Trochlear Nerve (IV) 19
20 Subcortical Structures of the Forebrain Limbic System (Lobe) Cingulate Gyrus Parahippocampal Gyrus Hippocampal Formation Amygdala Hippocampus Fornix Mammillary Bodies Basal Ganglia Globus Pallidus Caudate Nucleus Putamen Diencephalon Thalamus Hypothalamus 20
21 Hypothalamus and Eating Behavior Teitelbaum & Epstein (1962); Teitelbaum (1976) Ventromedial Lesions Hyperphagia Lateral Lesions Aphagia Dual-Center Theory VMH Inhibits Eating LH Disinhibits Eating 21
22 Patient H.M. Bilateral Resection of Hippocampus Scoville & Milner (1957); Milner, Corkin, & Teuber (1968) Anterograde Amnesia 22
23 The Medial Temporal Lobe Memory System Squire & Zola-Morgan (1991) Association Areas Frontal, Temporal and Parietal Cortex 23
24 Patient S. Bilateral Calcification of Amygdala Adolphs, Tranel, Damasio, & Damasio (1994) 24
25 The Triune Brain MacLean (1970, 1990) Neocortex New Brain Limbic System Old Mammalian Brain Amygdala Hypothalamus Hippocampus R-Complex Reptilian Brain Brain Stem Cerebellum 25
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Chapter 8 outline CNS: Consists of???? Structural organization of the brain Cerebrum Diencephalon Midbrain and hindbrain Spinal cord tracts Cranial and spinal nerves Receives input from???? neurons Directs