The image is taken from the study. The caption provides a better description.

Scientists Identify Clue to Regrowing Nerve Cells

Researchers have identified a chain reaction which triggers the regrowth of some damaged nerve cell branches. The finding could someday help improve treatments for nerve injuries which can cause loss of sensation or paralysis.
brain-machine-interface-eye-tracking

Controlling Your Computer With Your Eyes

Millions of people suffering from multiple sclerosis, Parkinson's, muscular dystrophy, spinal cord injuries or amputees could soon interact with their computers and surroundings using just their eyes, thanks to a new device that costs less than £40 (~$63).