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Amnesia

Amnesia. Loss of memory ability - usually due to lesion or surgical removal of various parts of the brain. Causes of Amnesia. Concussion Migraines Hypoglycemia Epilepsy Electroconvulsive shock therapy Specific brain lesions (i.e. surgical removal) Ischemic events

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Amnesia

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  1. Amnesia • Loss of memory ability - usually due to lesion or surgical removal of various parts of the brain

  2. Causes of Amnesia • Concussion • Migraines • Hypoglycemia • Epilepsy • Electroconvulsive shock therapy • Specific brain lesions (i.e. surgical removal) • Ischemic events • Drugs (esp. anesthetics) • Infection • Psychological • Nutritional deficiency • Lack of Sleep!

  3. Amnesia • Loss of memory ability - usually due to lesion or surgical removal of various parts of the brain • Two broad categories: • Retrograde: loss of memories for events prior to damage

  4. Amnesia • Loss of memory ability - usually due to lesion or surgical removal of various parts of the brain • Two broad categories: • Retrograde: loss of memories for events prior to damage • Anterograde: loss of ability to store new memories of events after damage

  5. Amnesia Retrograde Amnesia Anterograde Amnesia

  6. Amnesia • Short-term and sensory memory are typically functional

  7. Korsakoff’s Syndrome The Lost Mariner - What happened to Jimmie? What was his life like?

  8. Korsakoff’s Syndrome (The Lost Mariner) • Lesions to Medial Thalamus • Results from chronic alcoholism and consequent thiamine deficiency

  9. Korsakoff’s Syndrome (The Lost Mariner) • Lesions to Medial Thalamus • Results from chronic alcoholism and consequent thiamine deficiency • Severe anterograde amnesia

  10. Korsakoff’s Syndrome (The Lost Mariner) • Lesions to Medial Thalamus • Results from chronic alcoholism and consequent thiamine deficiency • Severe anterograde amnesia • Severe retrograde amnesia extending years before damage

  11. Korsakoff’s Syndrome (The Lost Mariner) • Lesions to Medial Thalamus • Results from chronic alcoholism and consequent thiamine deficiency • Severe anterograde amnesia • Severe retrograde amnesia extending years before damage • Confabulation - make up stories to explain absence of memory

  12. Korsakoff’s Syndrome (The Lost Mariner) • Lesions to Medial Thalamus • Results from chronic alcoholism and consequent thiamine deficiency • Severe anterograde amnesia • Severe retrograde amnesia extending years before damage • Confabulation - make up stories to explain absence of memory • Often unaware of their deficit

  13. H. M. • Patient H. M. - suffered from extreme epilepsy

  14. H. M. • Patient H. M. - bilateral resection of medial temporal lobes (containing hippocampus) • William Beecher Scoville and Brenda Milner - late 1950’s

  15. H. M. • Patient H. M. - bilateral resection of medial temporal lobes (containing hippocampus) • William Beecher Scoville and Brenda Milner - late 1950’s • Severe anterograde amnesia

  16. H. M. • Patient H. M. - bilateral resection of medial temporal lobes (containing hippocampus) • William Beecher Scoville and Brenda Milner - late 1950’s • Severe anterograde amnesia • Retrograde amnesia for 1 - 3 years before surgery

  17. H. M.

  18. H. M. • Some aspects of memory were spared (at least to some extent)

  19. H. M. • Some aspects of memory were spared (at least to some extent) • Procedural memory was largely unaffected - amnesia was largely restricted to episodic memory

  20. H. M. • Some aspects of memory were spared (at least to some extent) • Procedural memory was largely unaffected - amnesia was largely restricted to episodic memory • Some implicit awareness of recent events

  21. H. M. • Some aspects of memory were spared (at least to some extent) • Procedural memory was largely unaffected - amnesia was largely restricted to episodic memory • Some implicit awareness of recent events • Normal digit span (short-term memory) !

  22. Hypermnesia - S. • “Photographic” extreme memory ability (a mnemonist)

  23. Hypermnesia - S. • “Photographic” extreme memory ability (a mnemonist) • Able to recall complex test stimuli

  24. Hypermnesia - S. • S. used two “strategies” or abilities typical of mnemonists: • Rich synesthesia-like quality to his perception of stimuli - leads to stronger associative links

  25. Hypermnesia - S. • S. used two “strategies” or abilities typical of mnemonists: • Rich synesthesia-like quality to his perception of stimuli - leads to stronger associative links • Vivid and elaborate mental imagery of things he should remember

  26. Hypermnesia - S. • “ Even numbers remind me of images. Take the number 1. This is a proud, well-built man; 2 is a high-spirited woman; 3 a gloomy person (shy, I don’t Know); 6 a man with a swollen foot...” Luria, A.R. The mind of a mnemonist. 1968 Luria, A.R. The man with a shattered world. 1972

  27. Next Time Awareness and Your Brain

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