Human evolution theory utilizing concepts of neoteny & female sexual selection
An etiology of neuropsychological disorders such as autism and dyslexia, and the origin of left handedness.
"One of the most important milestones in the life of a young male is when he begins to travel away from his mother with other members of the community. The severing of apron strings is far more necessary for a young male than for a young female. She can learn most of what she needs to know for a successful adult life whilst remaining safely in her family setting. Not only can she watch her mother and her mother's friends caring for their infants, but she can actually handle them herself, gaining much of the experience which she will need later when she had a baby of her own. And she can learn, during her mother's 'pink days', a good deal about sex and the demands that will subsequently be made of her in that sphere." (Goodall, Jane (1990) Through A Window. Houghton Mifflin: Boston p. 118)
"Throughout Gimble's infancy Gremlin was an integral part of the family. At Gombe there is no closer relationship in chimpanzee society than that between a mother and her grown daughter." (Goodall, Jane (1990) through A Window. Houghton Mifflin: Boston p. 166)
"All at once Evered charged forward, leapt up to seize one of the hanging vines, and swung out over the stream in the spray-drenched wind. A moment later Freud joined him. The two leapt from one liana to the next, swinging into space, until it seemed the slender stems must snap or be torn from their lofty moorings. Frodo charged along the edge of the stream, hurling rock after rock now ahead, now to the side, his coat glistening with spray.
For ten minutes the three performed their wild displays while Fifi and her younger offspring watched from one of the tall fig trees by the stream. Were the chimpanzees expressing feelings of awe such as those which, in early man, surely gave rise to primitive religions, worship of the elements?" (Goodall, Jane (1990) Through A Window. Houghlin Mifflin: Boston p. 241-242.)