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LA GRAMMATICA DI ENGLISH GRATIS IN VERSIONE MOBILE   INFORMATIVA PRIVACY

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WIKIBOOKS
DISPONIBILI
?????????

ART
- Great Painters
BUSINESS&LAW
- Accounting
- Fundamentals of Law
- Marketing
- Shorthand
CARS
- Concept Cars
GAMES&SPORT
- Videogames
- The World of Sports

COMPUTER TECHNOLOGY
- Blogs
- Free Software
- Google
- My Computer

- PHP Language and Applications
- Wikipedia
- Windows Vista

EDUCATION
- Education
LITERATURE
- Masterpieces of English Literature
LINGUISTICS
- American English

- English Dictionaries
- The English Language

MEDICINE
- Medical Emergencies
- The Theory of Memory
MUSIC&DANCE
- The Beatles
- Dances
- Microphones
- Musical Notation
- Music Instruments
SCIENCE
- Batteries
- Nanotechnology
LIFESTYLE
- Cosmetics
- Diets
- Vegetarianism and Veganism
TRADITIONS
- Christmas Traditions
NATURE
- Animals

- Fruits And Vegetables



ARTICLES IN THE BOOK

  1. Active recall
  2. Alzheimer's disease
  3. Amnesia
  4. Anamonic
  5. Anterograde amnesia
  6. Atkinson-Shiffrin memory model
  7. Attention versus memory in prefrontal cortex
  8. Baddeley's Model of Working Memory
  9. Barnes maze
  10. Binding problem
  11. Body memory
  12. Cellular memory
  13. Choice-supportive bias
  14. Chunking
  15. Clive Wearing
  16. Commentarii
  17. Confabulation
  18. Cue-dependent forgetting
  19. Decay theory
  20. Declarative memory
  21. Eidetic memory
  22. Electracy
  23. Emotion and memory
  24. Encoding
  25. Engram
  26. Episodic memory
  27. Executive system
  28. Exosomatic memory
  29. Explicit memory
  30. Exposure effect
  31. Eyewitness memory reconstruction
  32. False memory
  33. False Memory Syndrome Foundation
  34. Flashbulb memory
  35. Forgetting
  36. Forgetting curve
  37. Functional fixedness
  38. Hindsight bias
  39. HM
  40. Human memory process
  41. Hyperthymesia
  42. Iconic memory
  43. Interference theory
  44. Involuntary memory
  45. Korsakoff's syndrome
  46. Lacunar amnesia
  47. Limbic system
  48. Linkword
  49. List of memory biases
  50. Long-term memory
  51. Long-term potentiation
  52. Lost in the mall technique
  53. Memory
  54. Memory and aging
  55. MemoryArchive
  56. Memory consolidation
  57. Memory distrust syndrome
  58. Memory inhibition
  59. Memory span
  60. Method of loci
  61. Mind map
  62. Mnemonic
  63. Mnemonic acronym system
  64. Mnemonic dominic system
  65. Mnemonic link system
  66. Mnemonic major system
  67. Mnemonic peg system
  68. Mnemonic room system
  69. Mnemonic verses
  70. Mnemonist
  71. Philip Staufen
  72. Phonological loop
  73. Picture superiority effect
  74. Piphilology
  75. Positivity effect
  76. Procedural memory
  77. Prospective memory
  78. Recollection
  79. Repressed memory
  80. Retrograde amnesia
  81. Retrospective memory
  82. Rosy retrospection
  83. Self-referential encoding
  84. Sensory memory
  85. Seven Meta Patterns
  86. Shass pollak
  87. Short-term memory
  88. Source amnesia
  89. Spaced repetition
  90. SuperMemo
  91. Synthetic memory
  92. Tally sticks
  93. Testing effect
  94. Tetris effect
  95. The Courage to Heal
  96. The Magical Number Seven, Plus or Minus Two
  97. Tip of the tongue
  98. Visual memory
  99. Visual short term memory
  100. Visuospatial sketchpad
  101. VTrain
  102. Working memory


 

 
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    ENGLISHGRATIS.COM è un sito personale di
    Roberto Casiraghi e Crystal Jones
    email: robertocasiraghi at iol punto it

    Roberto Casiraghi           
    INFORMATIVA SULLA PRIVACY              Crystal Jones


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THE THEORY OF MEMORY
This article is from:
http://en.wikipedia.org/wiki/Engram_%28neuropsychology%29

All text is available under the terms of the GNU Free Documentation License: http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License 

Engram (neuropsychology)

From Wikipedia, the free encyclopedia

 

Engrams are a hypothetical means by which memory traces are stored as physical or biochemical change in the brain (and other neural tissue) in response to external stimuli.

They are also sometimes thought of as a neuronal network or fragment of memory, sometimes using a hologram analogy to describe its action in light of results showing that memory appears to be non-localized in the brain. The existence of engrams is posited by some scientific theories to explain the persistence of memory and how memories are stored in the brain. The existence of neurologically defined engrams is not significantly disputed, though its exact mechanism and location has been a persistent focus of research for many decades.

Overview

The term engram was coined by Richard Semon and explored by Anton Pavlov. Karl S. Lashley an American behaviorist well-remembered for his influential contributions to the study of learning and memory tried to locate the engram. His failure to find a single biological locus of memory (or "engram", as he called it) suggested to him that memories were not localized to one part of the brain, but were widely distributed throughout the cortex.

Lashley argued for distributed representations as a result of his failure to find anything like a localized engram in years of lesion experiments (src: Early work, Connectionism).

Later researcher, Richard F. Thompson, sought the engram of memory in the cerebellum instead of the cerebral cortex.

Thompson and his colleagues used classical conditioning of the eyelid response in rabbits in their search for an engram. They puffed air upon the cornea of the eye and paired it with a tone. This airpuff normally causes an automatic blinking response. After a number of trials they conditioned the rabbits to blink when they heard the tone even though the airpuff was no longer administered. During the experiment, they monitored several brain cells to try to locate the engram.

One brain region that they monitored that they thought was a possible part of the memory engram was the lateral interpositus nucleus (LIP), when chemically deactivated, it resulted in the rabbits, who were previously conditioned to blink when hearing the tone, to act as if the conditioning never took place; however, when they re-activated the LIP, they responded to the tone again with an eyeblink. This gives evidence that the LIP is a key element of the engram for this behavioral response. (James W. Kalat, Biological Psychology p.391-393)

It is important to stress that this approach targeting the cerebellum, though relatively successful, only examines basic, automatic responses. Almost all animals have these (especially as defense mechanisms) and it is fairly difficult to resist them. Imagine trying to avoid blinking when someone shoots something at your eye. Ideally, research by Thompson and others could eventually lead to isolation of more complicated engrams that control more abstract, declarative memories, like how one remembers one's name or the capital of France. Engrams could also explain why users of psychedelic substances experience "flashbacks", which are probably caused by their endogenous dimethyltryptamine, mostly produced in the pineal gland, because resemblances to previous spiritual experiences in their environment seem to trigger these effects.

The problem here is that considerable studies have shown declarative memories tend to move about the brain between the limbic system (deep within the brain) and the outer cortical areas. This contrasts with the more "primitive" set-up of the cerebellum, which controls the blinking response and receives direct input of auditory information. Thus, it does not need to reach out to other brain structures for assistance in forming simpler memories of association.

The engram in other contexts

The term engram has been used in contexts beyond the scope of neuropsychology, including

  • Neuro-linguistic Programming (Derks and Hollander 1998; Derks and Goldblatt 1985; Drenth 2003)
  • Artificial Intelligence
  • EST (Erhard Seminars Training)
  • Dianetics/Scientology
  • Science fiction
  • Rock climbing (motor engram)

Further reading

  • Forgotten Ideas, Neglected Pioneers: Richard Semon and the Story of Memory, Daniel Schacter, 2001
Retrieved from "http://en.wikipedia.org/wiki/Engram_%28neuropsychology%29"