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Fig. 6. Spread of artificial excitatory postsynaptic potentials (EPSPs) from one neurone to the other. (A) Current protocol used to produce artificial EPSPs in the soma of one of the neurones. (B) Artificial EPSP with a similar shape to natural EPSPs in the same neurone. (C) Artificial EPSPs arriving at the contralateral soma were smaller and had a slower rise time. The coupling ratio V2/V1, defined as the follower voltage (V2) divided by the driving voltage (V1), in these neurones was 0.31 (N=10). (D) The coupling ratio of natural EPSPs was 0.42 (N=32), greater than that of artificial EPSPs, as expected because of the different distances that each EPSP had to spread. Values given in the figure are means ± S.E.M.





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