Fig. 2. ANs encode behavioral states.
Proportion of variance in AN activity that is uniquely explained by regressors (cross-validated ΔR2) based on joint movements (a) (abbreviations refer to the left (L), right (R), front (F), middle (M) or hind (H) legs as well as joints at the thorax (Th), coxa (C), trochanter (Tr), femur (F), tibia (Ti) and tarsus (Ta)). Movements of individual legs (b), movements of pairs of legs (c) and behaviors (d). Regression analyses were performed for 157 ANs recorded from 50 driver lines. Lines selected for more in-depth analysis are color-coded by the behavioral class best explaining their neural activity: SS27485 (resting), SS36112 (puff responses), SS29579 (walking), SS51046 (turning), SS42740 (foreleg movements), SS25469 (eye grooming) and SS31232 (PEs). Non-orthogonal regressors (PE and CO2 puffs) are separated from the others. P values report the one-tailed F-statistic of overall significance of the complete regression model with none of the regressors shuffled without an adjustment for multiple comparisons (*P < 0.05, **P < 0.01 and ***P < 0.001). Indicated are putative pairs of neurons (black ball-and-stick labels) and ROIs that are on the left (red) or right (cyan) side of the cervical connective.