I once attended a neuroscience conference featuring a talk about spinal cord injury. The presenter showed a brief video clip that haunts me still toÂ this day.
The presenter showed a clip of his experiment in which he had crushed a cat’s spinal cord and was recording the cat’s movement on a treadmill. HeÂ had forcibly implanted electrodes into the cat’s brain and she was struggling to keep upright, dragging her paralyzed legs on the treadmill. SheÂ repeatedly fell off the machine.
At one point, the experimenter lifted her up to reposition her on the treadmill and the cat did something that was utterly unexpected.Â She rubbedÂ her head against the experimenter’s hand.