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Figure 3. Mean frequency of rearings and mean time rearing per square. These values were obtained by 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 number of walls per square was 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 (ANOVA followed by the Tukey test).