Fig. 2.

Vanishing bearings of anosmic controls (filled circles), anosmic hippocampal-lesioned birds (striped triangles), and control birds able to smell (open circles) recorded during the experimental releases from the familiar training locations. All pigeons were phase-shifted. Each data point on the periphery of acircle represents the vanishing bearing of one bird.Arrows in each circle represent the direction of the mean vector for each group. The length of thearrow approximates the mean vector length for a group, with the radius of the circle equal to 1.0.