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. 2005 Mar 1;3(3):e68. doi: 10.1371/journal.pbio.0030068

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Copyright: © 2005 Song et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) Synaptic connections in bidirectionally connected pairs are on average stronger than those in unidirectionally connected pairs. The probability density distribution for both the reciprocal (red solid, p(w) = 0.41exp(−(ln w + 0.60)²/(2 × 0.976²)/w) and nonreciprocal (blue dashed, p(w) = 0.47exp(−(ln w + 0.81)²/(2 × 0.834²)/w) connections are shown.

(B) In bidirectionally connected pairs synaptic connection strengths are moderately but significantly correlated (R = 0.36, p < 0.0001).

(C) Scatter plot of the strength of synaptic connections that shared no pre- and postsynaptic neurons in the same quadruple recording. There might be other connections in the quadruplet besides these two connections. No significant correlation is observed (R = 0.068, p = 0.48). All correlations calculated using Pearson's R method in log space.

(D) Average connection strength for bidirectional connections does not vary systemically with interneuron distance (one-way ANOVA, p = 0.068). Numbers on top of data points are the number of connections. Error bars are standard errors of the mean.