IPI-based study of the synchronization between LH series.

<p>The four LH series are retrieved from ewes subject to an experimental protocol inducing a steep decrease in the pulse frequency. Left panels: experimental LH plasma time series; vertical lines correspond to pulse occurrences. Right panels: resulting IPI series indexed by time. The vertical lines, the dashed line and the solid lines represent the same objects as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0039001#pone-0039001-g009" target="_blank">Figure 9</a>. Vertical dashed line: break in the dynamics of the IPI series corresponding to the last IPI preceding the outlier.