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Figure 7


Fig. 7. Typical measurement data of the force response of the bees. The red lines represent the raw measurement data of the vertical force (F0), without any compensations. The source of fine oscillations in F0 is certainly the wingbeat of the bee; the oscillation frequency is approximately 150 Hz in common throughout A-D. The broken blue lines represent the filtered data of F0. The bold broken green lines represent the visual stripe position. The upward direction is defined as the positive direction for both F0 and zv. (A) Visual oscillation frequency is 0.9 Hz (5.6 rad s-1). The phase of F0 obviously precedes that of zv. (B) Visual oscillation frequency is 1.8 Hz (11 rad s-1). The phase of F0 still precedes that of zv. (C) Visual oscillation frequency is 3.6 Hz (22 rad s-1). The phase difference between F0 and zv is small. (D) Visual oscillation frequency is 7.4 Hz (46 rad s-1). The phase of F0 obviously lags behind that of zv. Although the variation in the phase through A-D is clear, the amplitude of F0 is relatively constant.





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