Figure 8. Dopamine neuron stimulation alters the coordination between digit movements and paw advancement.

(A) Sample frames from single reaches at the end of ‘retraining’ and ‘laser on’ sessions from the same rat. Outer columns show the mirror views corresponding to the direct camera views in the inside columns. After 10 days of ‘during reach’ stimulation, the rat pronates its paw and spreads its digits further from the pellet as the paw advances. (B) Aperture as a function of the z-coordinate of the second digit tip. Solid black and blue lines correspond to the reaches shown in (A). Thin black and blue lines are the traces for other reaches in the same sessions. Circles indicate apertures at the corresponding z_digit2 values in (A). (C) Same as (B) but for paw orientation.