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. 2012 Jan 26;8:5. doi: 10.1186/1744-9081-8-5

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Copyright ©2012 Hill et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Semi-log survival plots showing the mean proportion of IRTs greater than t in each schedule (symbols), strain (columns), and epoch (rows). Proportions were calculated for each rat in bins that contain, each, 1% of the IRTs; binned proportions were then averaged over rats. Curves through the data are the mean traces of the bout-and-pause model (Equation 3), drawn using maximally likely individual estimates. SHR survival functions (left panels) were steeper and more linear than those of WKY (center panels), indicating, respectively, shorter IRTs (higher response rate) and responses organized in less distinct bouts.