Fig. 7. The effect of spatial period on mean waggle duration (black bars) and the mean pure waggle duration (white bars). The walls and floor of the tunnel were lined with sinusoidal gratings of spatial periods 1.8 cm, 3.6 cm and 7.2 cm, as shown. A 92% contrast checkerboard pattern (Control 1) and axial stripes (Control 2) were used as controls. Other details as in Fig. 1.

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