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Hebbian theory is a neuropsychological theory claiming that an increase in synaptic efficacy arises from a presynaptic cell's repeated and persistent stimulation of a postsynaptic cell. It is an attempt to explain synaptic plasticity , the adaptation of brain neurons during the learning process.
Two molecular mechanisms for synaptic plasticity involve the NMDA and AMPA glutamate receptors. Opening of NMDA channels (which relates to the level of cellular depolarization) leads to a rise in post-synaptic Ca 2+ concentration and this has been linked to long-term potentiation, LTP (as well as to protein kinase activation); strong depolarization of the post-synaptic cell completely ...
The book is a collection of stories of doctors and patients showing that the human brain is capable of undergoing change, including stories of recovering use of paralyzed body parts, deaf people learning to hear, and others getting relief from pain using exercises to retrain neural pathways.
This second type of learning is a more rapid and insightful learning because the cell assemblies and phase sequences have already been created and now can be rearranged in any number of ways. [25] The Hebbian theory of learning implies that every experience a person encounters becomes set into the network of brain cells. Then, each time a ...
[1] Hence, it is the biological basis for learning and the formation of new memories. [ 1 ] [ 2 ] Activity-dependent plasticity is a form of neuroplasticity that arises from intrinsic or endogenous activity, as opposed to forms of neuroplasticity that arise from extrinsic or exogenous factors, such as electrical brain stimulation - or drug ...
Homeostatic synaptic plasticity is a means of maintaining the synaptic basis for learning, respiration, and locomotion, in contrast to the Hebbian plasticity associated with learning and memory. [3] Although Hebbian forms of plasticity, such as long-term potentiation and long-term depression occur rapidly, homeostatic plasticity (which relies ...
Jeffrey Schwartz and Sharon Begley, The Mind and the Brain: Neuroplasticity and the power of mental force, New York: Regan Books, 2002. ISBN 0-06-039355-6 . Jeffrey Schwartz, You Are Not Your Brain: The 4-Step Solution for Changing Bad Habits, Ending Unhealthy Thinking, and Taking Control of Your Life , New York: Avery, 2011.
Plasticity in the brain affects the strength of neural connections and pathways. Nonsynaptic plasticity is a form of neuroplasticity that involves modification of ion channel function in the axon, dendrites, and cell body that results in specific changes in the integration of excitatory postsynaptic potentials and inhibitory postsynaptic potentials.
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