Metaplasticity (original) (raw)
Unter Metaplastizität versteht man das Phänomen, dass Zellen, abhängig von ihrer „Vergangenheit“, bei Stimulationmit der gleichen Frequenz entweder LTP (Long-Time Potention; Langzeit-Potenzierung) oder LTD (Long-Term Depression; Langzeit-Depression: siehe Synaptische Plastizität) ausbilden können. Das heißt also, der vorherige Aktivitätszustand hat eine Auswirkung auf die Art und Ausbildung von langandauernder Plastizität. Es widerspricht somit der Tatsache, dass gleiche Stimuli immer gleiche Effekte haben. Das trifft allerdings nur auf ganz bestimmte Frequenzen zu. Das Standard-LTP-Induktionsprotokoll (high-frequency-stimulation) führt im wt (wildtype-mouse) also immer zu LTP. Metaplastizität erhöht aber so die Komplexität (und damit die Speicherkapazität) des Gehirns.
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| dbo:abstract | Unter Metaplastizität versteht man das Phänomen, dass Zellen, abhängig von ihrer „Vergangenheit“, bei Stimulationmit der gleichen Frequenz entweder LTP (Long-Time Potention; Langzeit-Potenzierung) oder LTD (Long-Term Depression; Langzeit-Depression: siehe Synaptische Plastizität) ausbilden können. Das heißt also, der vorherige Aktivitätszustand hat eine Auswirkung auf die Art und Ausbildung von langandauernder Plastizität. Es widerspricht somit der Tatsache, dass gleiche Stimuli immer gleiche Effekte haben. Das trifft allerdings nur auf ganz bestimmte Frequenzen zu. Das Standard-LTP-Induktionsprotokoll (high-frequency-stimulation) führt im wt (wildtype-mouse) also immer zu LTP. Metaplastizität erhöht aber so die Komplexität (und damit die Speicherkapazität) des Gehirns. (de) Metaplasticity is a term originally coined by W.C. Abraham and M.F. Bear to refer to the plasticity of synaptic plasticity. Until that time synaptic plasticity had referred to the plastic nature of individual synapses. However this new form referred to the plasticity of the plasticity itself, thus the term meta-plasticity. The idea is that the synapse's previous history of activity determines its current plasticity. This may play a role in some of the underlying mechanisms thought to be important in memory and learning such as long-term potentiation (LTP), long-term depression (LTD) and so forth. These mechanisms depend on current synaptic "state", as set by ongoing extrinsic influences such as the level of synaptic inhibition, the activity of modulatory afferents such as catecholamines, and the pool of hormones affecting the synapses under study. Recently, it has become clear that the prior history of synaptic activity is an additional variable that influences the synaptic state, and thereby the degree, of LTP or LTD produced by a given experimental protocol. In a sense, then, synaptic plasticity is governed by an activity-dependent plasticity of the synaptic state; such plasticity of synaptic plasticity has been termed metaplasticity. There is little known about metaplasticity, and there is much research currently underway on the subject, despite its difficulty of study, because of its theoretical importance in brain and cognitive science. Most research of this type is done via cultured hippocampus cells or hippocampal slices. (en) |
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| rdfs:comment | Unter Metaplastizität versteht man das Phänomen, dass Zellen, abhängig von ihrer „Vergangenheit“, bei Stimulationmit der gleichen Frequenz entweder LTP (Long-Time Potention; Langzeit-Potenzierung) oder LTD (Long-Term Depression; Langzeit-Depression: siehe Synaptische Plastizität) ausbilden können. Das heißt also, der vorherige Aktivitätszustand hat eine Auswirkung auf die Art und Ausbildung von langandauernder Plastizität. Es widerspricht somit der Tatsache, dass gleiche Stimuli immer gleiche Effekte haben. Das trifft allerdings nur auf ganz bestimmte Frequenzen zu. Das Standard-LTP-Induktionsprotokoll (high-frequency-stimulation) führt im wt (wildtype-mouse) also immer zu LTP. Metaplastizität erhöht aber so die Komplexität (und damit die Speicherkapazität) des Gehirns. (de) Metaplasticity is a term originally coined by W.C. Abraham and M.F. Bear to refer to the plasticity of synaptic plasticity. Until that time synaptic plasticity had referred to the plastic nature of individual synapses. However this new form referred to the plasticity of the plasticity itself, thus the term meta-plasticity. The idea is that the synapse's previous history of activity determines its current plasticity. This may play a role in some of the underlying mechanisms thought to be important in memory and learning such as long-term potentiation (LTP), long-term depression (LTD) and so forth. These mechanisms depend on current synaptic "state", as set by ongoing extrinsic influences such as the level of synaptic inhibition, the activity of modulatory afferents such as catecholamines, a (en) |
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