Listening to the music while stretching her body close to its limit, she was able to attain a mysterious calm. She was simultaneously the torturer and the tortured, the forcer and the forced. This sense of inner-directed self-sufficiency was what she wanted most of all. It gave her deep solace.
But complex animals had obtained their adaptive flexibility at some cost--they had traded one dependency for another. It was no longer necessary to change their bodies to adapt, because now their adaptation was behavior, socially determined. That behavior required learning. In a sense, among higher animals adaptive fitness was no longer transmitted to the next generation by DNA at all. It was now carried by teaching.