Social interactions of the mice.

<p>(<b>A, B</b>) Frequencies of sequences of entries into the corners. The heat maps show the relative frequencies of combinations of visits into the same corner by a pair of mice that occurred within the interval of 1 second to 1 minute. Each mouse was assigned an alphabet letter. On the maps, the first mouse in the sequence is indicated on the x-axis, and the second mouse is indicated on the y-axis; e.g., the bottom leftmost square corresponds to the frequencies of the ‘aa’ pairs. The intensity of the color is proportional to fraction of a specific pair among all pairs with the same first mouse (thus each column has a sum of 1). The intensity scales are indicated to the right of each heat maps. The data shown correspond to the last 4 intervals with alcohol access. Panel A shows data derived from 2972 pairs (filtered from 6548) and panel B represents 4643 pair sequences (filtered from 8573). (<b>C, D</b>) Interactions diverging from a random pattern. The heat maps show the relative statistical significances of pairs of entries (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0096787#s2" target="_blank">Methods</a> for the score calculation method). Only pairs with |scores| >2 are shaded. (<b>E, F</b>) Interactions diverging from a random pattern with repeats removed. The scores were calculated as in C and D, but they exclude all instances of the same mouse performing repeated entries (e.g., ‘bb’). The numbers shown near the axes are the alcohol preferences and animal weights. Only pairs with |scores| >2 are shaded.