Figure 2

<p>Structure function analysis. a) Structure functions characterizing the displacements, Δ<i>X_τ</i>, in a time increment <i>τ</i> of hungry <i>Drosophila</i> in an odorless arena with white walls (symbols). <i>Drosophila</i> flights were projected onto the horizontal (x-y) plane. Power-scaling of the structure functions is indicated (dashed line). This scaling was obtained from least squares fitting of logarithms of the structure functions to logarithms of the time intervals, <i>τ</i>, for<i>τ</i>≤1<i>s</i>. b) Scaling-exponents, <i>ζ</i>, obtained in this manner are typically prescribed with a standard error of about ±0.01<i>q</i> and Pearson's correlation coefficient, <i>R</i>² = 0.99 Scaling exponents (symbols, o) are well represented by <i>ζ</i> = 0.9<i>q</i> (solid line) (<i>R</i>² = 1).