M.R. Lamprea, F.P. Cardenas, J. Setem and S. Morato. Thigmotactic responses in an open-field. Braz J Med Biol Res 2008; 42: 135-140.

Figure 4. Mean frequency of groomings and mean time grooming per square. These values were obtained dividing the totals occurring in squares with a certain number of walls surrounding them and dividing by the number of walls. 2W = open-field in which the maximum amount of walls per square is two or 3W = open-field with the block that allowed a maximum number of three walls in certain squares. d.f. = degrees of freedom; F = statistical F value; *t* = statistical *t* value for the specified number of d.f.; P = probability. *P <0.05 compared to squares with a smaller number of walls; ^{o}P < 0.05 compared to squares with no walls and one wall (ANOVA followed by the Tukey test).