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This is free online shultc flash human physiology games. Download online game for free use HOW THE HUMAN BRAIN EVOLVEDWe slowly ascended from lower life forms to what we are today, by a process of natural selection from randomly occurring changes. Each change had to prove its worth by surviving the continual battle for existence, being against being, species against species and this process has gone on for many millions of years. As far as we know the human brain evolved in three main stages. Its ancient and primitive part is the innermost core reptilian brain. Next evolved the mammalian brain by adding new functions and new ways of controlling the body. Then evolved the third part of the brain, the neocortex, the grey matter, the bulk of the brain in two symmetrical hemispheres, separate but communicating. To a considerable extent it is our neocortex which enables us to behave like human beings. So the human brain consists of these three different but interconnected brains and the way in which these three brains interact with each other underlies human behaviour. How the brain evolved and functions is explored and described in the immediately following chapters which cover how the brain evolved, sleep and sleeping, dreaming and dreams, and how we learn, memorise and remember. The final chapters contain conclusions which describe how the functioning of the human brain and of the human mind determine behaviour. What we see in this report raises a number of pertinent questions which need answering. Questions such as why do we have to struggle for a better life and what motivates human beings. Reptilian BrainInnermost in our brain is what is called the reptilian brain, its oldest and most primitive part. The reptilian brain appears to be largely unchanged by evolution and we share it with all other animals which have a backbone. This reptilian brain controls body functions required for sustaining life such as breathing and body temperature. Reptiles are cold-blooded animals which are warmed by the daylight sun and conserve energy by restricting activities when it is dark. The biological clock (controller) for their activity-rest cycle is located in the eye itself. At this level of evolution, behaviour relating to survival of the species, such as sexual behaviour, is instinctive and responses are automatic. Territory is acquired by force and defended. Might is right. Project index
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