Fig. 6.
Dynamics of the deformations induced by three different classes of motoneurons. The time course of the elementary deformations for the contractions induced by motoneurons 107 (A), 110 (B), and 12 (C) were obtained from the sequence of instantaneous optical flows. The motoneurons were stimulated to fire at a frequency between 20 and 40 Hz for 6 (cell 107 and 110) or 1 (cell 12) sec. The bar at the top of each panel shows stimulation duration. The units in which the time varying deformations are expressed in seconds−1 because the data were calculated from every fifth image and the images were acquired at 5 Hz. Each panel shows the time evolution of expansion E(⋄), rotation ω (■), longitudinal shearS1 (Δ), and oblique shearS2 (○).