Figure 5.

Visual feedback prevents pairwise interlimb correlations underlying postural adjustments

(A) Left: tracking labels of leg position. Right: time series of head angle, body velocities, and leg positions parallel (Y) or orthogonal (X) to body direction. Red shade: body saccade; cyan shade: forward run. BL, body length.

(B) Forward runs aligned at the starting position, colored by path deviations.

(C) Number of legs in the air during forward runs versus path deviation (average ±SD, N = 52 flies; n = 15,754 forward runs).

(D) Distributions of leg landing and lift-off positions with respect to the body, color coded by path deviation. Arrows: movement from the center of the landing to the center of the lift-off distributions.

(E) Leg X landing position in a single step (grand mean ±SEM, N = 52 flies; n = 42,524 high-quality steps; STAR Methods) versus the body angular deviation in that step (Figure S5). Color code is the same as in (A).

(F) Body angular deviations versus front-leg-correlated lateral movement classified by the direction of the initial leg displacement (left: blue; right: red; grand mean ± SEM, N = 52 flies; n = 42,524 high-quality steps).

(G) Schematic of the relationship between posture stability change (Δs_i and Δs_i+1), front-leg lateral displacement (ΔFLx_i), correlated front-leg lateral movement in consecutive steps (ΔFLx_i+1), and body angular deviations (α).

(H) Posture stability increase (%Δs) following an initial leg displacement versus average path straightness under different visual environments (grand mean±SEM, colored). Chance was calculated by shuffling the step sequence. See also Video S3.