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The reptilian brain is the oldest part of the triune brain. And the triune brain is a unified account of brain function and brain evolution. The story goes like this. The brain can be divided into three sections: The reptilian brain, named so because it encompasses structures that did not change much from reptile to man. It includes the basal ganglia and ...


7

There are (at least) two ways epigenetic traits are inherited. The important background in both cases is gene expression: there is a misconception that genes are for this or that, where the reality is that most traits come from an overlap of several genes expressing themselves in different ratios. As a simple example, consider two varieties of bird of the ...


5

In my mind there are two main explanations of this kind of instinct behaviours. The first one is rooted in evolution. There are many examples of human innate behaviours which we can't explain e.g. when we see a lace or tape on the street we automatically jump and feel scared. Although we live in big city our brain associates the lace with a snake. It is ...


5

The first question is, what is normal human sexual behavior. The answer to this changes over time. For example, a hundred years ago masturbation was thought to cause physical degeneration and be a sin, today it is perceived as healthy, even recommended. Research shows that adolescent girls who masturbate have more and stronger orgasms as adults. So, if anal ...


5

Iguanas are not carnivores. Look at it historically: we have had useful animals around us for thousands of years: dogs to help hunting, cats to keep vermin away. Other non-carnivorous pets was at some point - and still are - domesticated for food (rabbits, guinea pigs). Pigs are a gray area: they will pretty much eat anything, meat included. Then you ...


4

This is in reply to your first question. Taste – in food, music, and sex – is in part a result of imprinting. You find women or men attractive that are like your parents or the community you grew up in because of sexual imprinting (e.g. Aronsson, 2011). Aronsson writes of a sensitive period where this imprinting happens, but I am not so sure that the ...


4

My answer to this question would be pretty straightforward. From a neurobiological standpoint, sex causes the release of various pair-bonding influencing hormones oxytocin, vasopressin and dopamine. These "feel good" hormones promote bonding and basically encourage the couple to stay together. The more the pair have sex, the more these hormones get ...


3

What is the difference in the brains for animals capable of these great differences in sexual activity and what part of the brain is responsible for this? In my opinion is a matter of creativity and curiosity. Evolved species try to interact with their ambient in unusual ways, testing different approach to the same "problem" not only to satisfy ...


3

I think the treatment of the “Reptile Brain's” power given by Big Bang really sells it short. Your question immediately brought to my mind a 2009 profile by the Washington Post's Gene Weingarten of parents who leave their children in the car to die, all by accident. It's a long and difficult read, and it took me quite some time to dig it up again since I ...


1

Looking for acknowledgment is so important trait that some authors extracted specific contruct which can be responsible for this tendency - need for social approval. Polish researchers use Social Approval Questionnaire (by Drwal, 1995) next to the other tests, in order to exclude from their data base unreliable responses. It can be interesting for you what ...


1

There are two very broad domains of theory that commonly address the double standard regarding promiscuity. Haven't got the time to lay it all out at the moment (would be happy to edit later to elaborate if you like; just comment on what aspects you'd like expanded!), but as you suspected, both biological and social factors pertain in ways that are essential ...


1

In chimpz, we see stronger chimps beating up weaker chimps that have consensual sex. Basically sex is not a purely consensual matter among chimps. It's to the best interest of stronger males to prohibit weaker males from entering mating market especially if the weaker males are more attractive. In gorilla, sex is not about consent at all. The stronger ...



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