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. 2012 Mar;2(2):97–108. doi: 10.1002/brb3.36

Figure 7.

Figure 7

Flies display wall-following behavior in an hourglass-shaped arena. (A). The hourglass arena. This arena is 10 cm long × 5 cm wide, and 0.7 cm in height. A fly walking in this arena may make an HT by following the wall from one chamber into the next, or it may make a VT by crossing the 2 cm central chasm. (B). There were no significant differences between Canton-S and the blind norpA7 in either the number of vertical (F1,57 = 0.280, P = 0.599) or horizontal (F1,57 = 0.0003, P = 0.98) transitions at the chasm. n = 32 for each genotype. The VT indexes are negative for both genotypes. (C). Wall-following behavior does not require walking on the walls in the hourglass arena. Canton-S males were examined for vertical and HTs. The position of the fly, either walking on the wall or walking adjacent to the wall, was recorded for each transition. The VT index was separately determined for all transitions or with the wall-walking transitions excluded. n = 64.