Unformatted text preview: Space constant (also called length constant or characteristic length) V X = V X=0 (e -x/ Î» ) where X = distance from source (synapse) Î» = (R m /R i ) 1/2 at a distance of one space constant, X = Î» thus, V X = V x = 0 (e-1 ) V x = V x=0 (0.37) So, at a distance of one space constant, the PSP has decayed to 37% of its value at the synapse. Or, to put it another way, one space constant is the distance it takes for the PSP to decay to 37% of its initial value. The larger the space constant, the more slowly the PSP decays with distance from the synapse. Note also that as R m increases , the space constant increases; as R i decreases , the space constant increases....
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- Fall '08
- Radioactive Decay, Length constant, space constant increases