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VISUAL CONTROL OF VELOCITY OF APPROACH BY PIGEONS WHEN LANDING

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Figure

Fig. 1. (A) Notation for linear approach. At time ) constant at thedifferent values shown (see Appendix 1 for equations of curves)
Table 1. Means (standard deviations) of coefficients of linear regressions of �(xbreast),�(xfeet,lp) and velocity x˙breast on time-to-contact of feet with perch under the threeexperimental conditions
Fig. 3. Plots of feet,lp) constant, as against keeping .(�x(coefficients given in Table 1)
Fig. 4. Index of dispersion (standard deviation/mean) for xocclusion. Under normal vision, index of dispersion was consistently lowest for or time to contact with perch ((indicating that foot extension is governed by three experimental conditions: A, normal vision; B, control occlusion; C, monocularfeet,lp, �(xfeet,lp) and time to contacttc) with the perch at foot extension (time 0 on abscissa) and at preceding times, under the�(xfeet,lp),�(xfeet,lp) as against distance from perch (xfeet,lp)tc).
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