@dolphin
...except humans are not merely the product of their genes and background. They have free will, and they can choose to act in ways not predicted by their background.
When I did psychology at uni, we covered attachement theory, and it's idea that the relationship you have with you parents acts as a template for relationships later in life. A person with a 'secure' attachment to their parent tend to have better relationships with partners later on. Crap parenting, breeds craps relationships, breeds crap parenting.
The interesting thing was that a small group of individuals were described as 'earned secure'; they had had bad or indifferent attachement styles as a child but changed later in life, to have secure and happy adult relationships. Not a big group, obviously, but enough to make clear that we are not inevitably damned by our upbringing.
@l39
"Adoptive or foster mothers, childless nannies or childminders, older siblings - oh, and of course fathers - cannot by definition have these special neurons."
Yep. I'm a father, so by definition, when it comes to children, I'm flailing around like an incontinent chimp in a space shuttle. I can't tell my arse from my elbow, or (more importantly) DS's arse from his elbow. I usually just keep him quiet with whisky and CBeebies.