Notes Midsemester Evals Exam Human Neuropsychology 486 686
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Notes: Mid-semester Evals Exam
Human Neuropsychology (486 / 686) Lecture Chapter 18 “Learning and Memory”. 2
Learning and Memory l Multiple Memory Systems Different kinds of learning and memory use independent neural processes
Varieties of Amnesia Retrograde Amnesia - Infantile - Fugue - Time – dependent - Transient global Anterograde Amnesia - Transient global ECT ; Restricted damage, alcohol and drugs
Theories of Retrograde Amnesia l Consolidation Theory l Multiple-trace Theory l Reconsolidation Theory
Multiple Long-Term Memory Systems l Three types of long-term memories Explicit Memories “Top-down” processing Implicit Memories “Bottom-up” processing Emotional Memory “Bottom-up” and “Top-down” processing
Implicit vs Explicit vs Emotional Memory l H. M. - Able to learn to l complete a task, yet has no memory of ever having performed the test J. K. - Implicit memory deficits: Forgot how to turn on lights Preserved memory for events and new experiences l Dememtia patients: explicit and Implicit memory deficits - “prefer” photos of relatives
Neural Substrates of Explicit Memory Temporal-frontal-lobe neural basis for explicit memory
Anatomy of the Hippocampus l Perforant pathway l Fimbria-Fornix pathway
Hippocampal Function: l Case Histories of Hippocampal Function Progressively greater damage leads to progressively more significant retrograde amnesia l Neural Connections to the Hippocampus l Conclusions: 1. Anterograde deficits are more severe 2. Episodic memories are more affected than semantic memories 3. Patients cannot time travel to the past or future
The Rhinal Cortex
Hemispheric Specialization Temporal cortex: Right Temporal - face recognition, spatial position, and maze learning Left Temporal - word lists, consonant trigrams, nonspatial associations, and on the Hebb Recurring. Digits test Frontal Cortex: Left Prefrontal - Encodes semantic and episodic information Right Prefrontal - Retrieves episodic information
Diffuse Damage and Explicit Memory l Herpes Simplex Encephalitis l Alzheimer’s Disease l Korsakoff’s Syndrome
Neural Substrates of Implicit Memory l Circuit for implicit memory Neocortex and basal ganglia
Neural Substrates of Implicit Memory l Basal Ganglia Huntington’s chorea l Motor Cortex Pursuit-Rotor Task l Cerebellum
Neural Substrates of Emotional Memory Damage to the amygdala disrupts emotional memory, but not implicit or explicit
Neural Substrates of Short-Term Memory l Short-term memory and the Frontal Lobes Separate systems for short-term spatial memory and short-term object memory
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