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     Nervous System  

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Memory Page

 Nervous System


Contents

Neurons and Nerves

Neurotransmitter
The Brain
Spinal Cord
Peripheral Nervous System
Autonomic Nervous System
Senses: Sight, Senses, Smell, Taste, Senses, Senses

Memory
Higher Functions
Altered States

   

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    Memory

    Types of Memory As shown in Figure 03a, the ability to modify our behaviour in response to life's experiences is shared by all animals including the bacteria E. coli. Such feat requires the brain's willingness to learn. Learning results in the formation of memories and in humans this process reaches its most sophisticated form, allowing us creatively to associate different reflections on the past, to generate new ideas, and most importantly to acquire language as a medium of expression and communication. Memory requires the brain to be physically altered by experience and it is this remarkable property that makes thought, consciousness, and language possible. The basic mechanism of memory formation is highly conservative over

    Figure 24a Memory Classification
    [view large image]

    billion years of biological evolution. The difference in humans is that we have a lot more of the stuffs. There are about 100 trillion synaptic connections in our brain.

     
    Memory There are many ways to classify the memory. The concept of explicit and implicit memory refers to whether or not the recollection is produced consciously and intentionally. While the scheme of declarative and nondeclarative memory depend on the retrieval that can be declared verbally or not. Associative memory is triggered by clues; nonassociative memory can be habitual or sensitive. There are also short term and long term memory. One of the classification schemes is shown in Figure 24a. Table 06 is an attempt to put them all together. In the table, the declarative, and the procedural memory are explicit with the rest of nondeclarative memories being implicit. Only the working memory belongs to the category of short term memory fading away in hours, while the others are long term, and available for retrieval in years. Figure 24b shows the components,

    Figure 24b Types of Memory
    [view large image]

    locations, and pathways for many types of memory.


     


     
    Type Location(s) Function Example(s)
    Working Memory      
    Phonological Loop Left hemisphere Rehearsing verbal information to keep it in the short-term memory String of numerals and alphabets such as telephone numbers
    Visual-spatial Scratch Pad Visual Cortex Controlling visual imagery Scanning text
    Central Executive Frontal lobe Controlling awareness of the information in working memory Constructing sentence, comprehending speech
    Non-declarative Memory      
    Procedural Memory Cerebellum, temporal lobes Managing "how to" Riding a bicycle, kungfu exercise
    Classical Conditioning Cerebellum Forming habitual behaviour Coffee break, afternoon tea
    Fear Memory Amygdala Emotional conditioning Phobias, flashbacks
    Nonassociative Memory Spinal cord Habituation and Sensitization Decreased or increased responsiveness to stimulus
    Remote Memory (Priming) Scattered around the cortex Foundation for new memories Childhood memory
    Declarative Memory      
    Episodic Memory Cortex Remembering past experience Some enchanted evening
    Semantic Memory Frontal lobe, temporal lobe Registering facts Meanings of words and symbols

    Table 06 Types of Memory

    Go to the nervous system

     

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