The proportion of the angular interval during the different phases of a movement segment in normal, alcohol- and cocaine treated flies.

<p>Dark blue – φ = 0±22.5; light blue – φ = 45±22.5; green – φ = 90±22.5 deg; orange – φ = 135±22.5 deg; brown – φ = 180±22.5 deg. Each stack bar represents the proportion out of the whole population of the misalignment angles characterizing each of the mode types in the normal and in the treated flies. Proportions were calculated for the data pooled from 8 flies.