Fig. 6. Deprivation experiments. The frontal fields of view of the ants were obscured by screens (for exact positions, see Fig.3). The heavy dotted line (in B and C) indicates the normal homing direction. (A) Homeward paths of ants deprived of the lower parts of their frontal fields of view (screen A positioned 1m behind the nest; see Fig.4B). N=20. (B) Homeward paths of ants deprived of their entire frontal fields of view (screen B, positioned 3.1m from F9.5, as indicated by the heavy black line; height 1.8m). N=13. (C) The same screen as in B, but raised by 10cm, so that the ants were able to pass underneath it. N=13. N, nest.