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Fig. 3. Drosophila optomotor behavior. (A) Average response of eight
(except for 5°, where N=4) individuals to six different spatial
wavelengths. Positive values indicate head deflections with the direction of
the pattern, and negative values indicate deflections in the reverse
direction. (B) For each wavelength the cumulative, normalized, mean of the
last 3 s is indicated by a circle ± s.e.m. bars. The solid line is the
best-fitting EMD model, with mean sampling bases of 4.8° and 4.9° with
s.d. of 0.1° for both, acceptance angle of 7°, and a bias B of 1.02
towards the smaller sampling base. Numbers indicate sample sizes for each
spatial wavelength.