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Reconsolidation: Behavioural and Electrophysiological Sequelae of Context and Stress in Human Episodic Memory

von Dr. Jennifer L. Moore

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[1.] Jm/Fragment 065 09 - Diskussion
Zuletzt bearbeitet: 2014-01-12 21:16:45 Graf Isolan
Fragment, Gesichtet, Jm, KomplettPlagiat, SMWFragment, Scanlon et al 2006, Schutzlevel sysop

Typus
KomplettPlagiat
Bearbeiter
Hindemith
Gesichtet
Yes.png
Untersuchte Arbeit:
Seite: 65, Zeilen: 9-24
Quelle: Scanlon et al 2006
Seite(n): 5, Zeilen: 1st col: last paragraph, 2nd col: 1ff
2.3.3 Physiological basis of ERPs

2.3.3.1 Electrical activity in the brain

Communication in the central nervous system takes place through the transmission of electrochemical signals between nerve cells, or neurons (see Figure 2.2). Messages to either excite or inhibit activity in other neurons are passed via the release of neurotransmitter substances from the axon of the efferent (or pre-synaptic) cell to the dendritic tree or cell body of the afferent (or post-synaptic) neuron. The neurotransmitters influence the activity of the neuron by binding to receptors which alter the electrical potential across the membrane of the cell. Due to the constant influx and outflow of both positively and negatively charged ions across this membrane, the equilibrium state, or resting potential, of a neuron is approximately –70 mV. Any deviation from this state will make the cell either more or less likely to generate an action potential. An excitatory signal from a presynaptic cell will cause certain ion channels to open or close, with the result that the membrane potential rises from – 70 mV to 0 mV and possibly higher. Such excitatory impulses are termed Excitatory Post- Synaptic Potentials (EPSPs). If the membrane potential rises above a particular threshold level, approximately +30 mV, then an action potential is generated in the neuron, and [neurotransmitter is released onto another cell.]

Physiological basis of ERPs

Communication in the central nervous system takes place through the transmission of electrochemical signals between nerve cells, or neurons (see Figure 2). Messages to either excite or inhibit activity in other neurons are passed via the release of neurotransmitter substances from the axon of the efferent (or pre-synaptic) cell to the dendritic tree or cell body of the afferent (or post-synaptic) neuron.

The neurotransmitters influence the activity of the neuron by binding to receptors which alter the electrical potential across the membrane of the cell. Due to the constant influx and outflow of both positively and negatively charged ions across this membrane, the equilibrium state, or resting potential, of a neuron is approximately –70 mV. Any deviation from this state will make the cell either more or less likely to generate an action potential. An excitatory signal from a presynaptic cell will cause certain ion channels to open or close, with the result that the membrane potential rises from –70 mV to 0 mV and possibly higher. Such excitatory impulses are termed Excitatory Post-Synaptic Potentials (EPSPs). If the membrane potential rises above a particular threshold level, approximately +30 mV, then an action potential is generated in the neuron, and neurotransmitter is released onto another cell.

Anmerkungen

No reference to the source.

Sichter
(Hindemith) Agrippina1


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