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Figure 2. Mean frequency of entries and mean time spent 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 larger number of walls; °P < 0.05 compared to squares with a smaller number of walls (ANOVA followed by the Tukey test). ^{+}P < 0.05 compared to different 3W (Student *t*-test).