Wistar rats maintained at the animal facility of the Ribeirao Preto School of Medicine at the University of Sao Paulo, Brazil, were tested for audiogenic seizures, using as criteria an SI and the L1 (ref. RGD:14695082). The WAR colony foundation stock was produced by mating animals displaying at least procursive behaviors in three consecutive tests, one every 4 days (two males and four females). Each couple produced two or three lit-ters, from which selected individuals displaying the highest SI and shortest L1 were mated, at adult age,with their fathers and mothers. From the second generation on, brother and sister matings were done, in a ratio of one male to two females, selected accordingto the criteria above.