Fig. 4.

Reconstruction of axons of monkey M imaged at three time points before training (week 1) and over the course of perceptual learning. The top row compares axons imaged at week 0 (A) and week 6 (B), and the bottom row compares axons imaged at week 6 (C) and week 8 (D). Axons that were stable between these pairs of imaging sessions are shown in blue, pruned axons are shown in red, and newly sprouted axons are shown in green. (Scale bar: 200 μm.)