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synaptic noise
Synaptic noise refers to the constant bombardment of synaptic activity in neurons. This occurs in the background of a cell when potentials are produced without the nerve stimulation of an action potential, and are due to the inherently random nature of synapses. These random potentials have similar time courses as excitatory postsynaptic potentials (EPSPs) and inhibitory postsynaptic potentials (IPSPs), yet they lead to variable neuronal responses. The variability is due to differences in the discharge times of action potentials.〔Francesco, M. Roger, and Dario. "Motor Unit Recruitment Strategies and Muscle Properties Determine the Influence of Synaptic Noise on Force Steadiness." Journal of neurophysiology 107.12 (2012): 3357-69. Biological Sciences. Web. 5 Nov. 2012.〕
==Causes==
Many types of noise exist in cells. First, there is intrinsic noise and extrinsic, or synaptic, noise. Within each category there are two further divisions of noise – voltage noise or temporal noise. Intrinsic voltage noise is due to random changes in the membrane potential of a cell, and intrinsic temporal noise is caused by variations in spike generation timing. The following sections give explanations about the causes of synaptic noise.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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