Correlations between the parameters measured in Experiment 3.

A: Relationships between the pairs of parameters with significant correlations. Blue and red points indicate data from rats in the vehicle and the AM-251 groups, respectively. NI: number of intromission; HD: the duration of head-head contact (sec/min); ST: the frequency of the transition from stop without contact to head-head contact (/min); PL: the path length during the solitary period (cm/min); TH: the averaged trunk height during the solitary period (cm). The inset numbers represents the results of simple regression analysis; Left: r2 value; Middle: F value [F(1,15)]; Right: p-value. B: Summary of the correlation analysis. The curved lines in the graph represent the significant correlations between parameters. The thickness of a curved line is proportional to the r2 value, whereas the colors indicate positive (black) and negative (red) correlations. PEI: post-ejaculatory interval.