The Bases of Human Behaviour — Psychology STD 11 Humanities — Question

• Evolution refers to gradual and orderly biological changes that result in a species from their pre-existing forms in response to their changing adaptation demands of their environment.
• Physiological and biological changes that take place as a result of evolutionary processes are so slow that they become visible after hundreds of generations.

Three important features of modem human beings include:

• A trigger and developed brain with increased capacity for cognitive behaviours (like perception, memory, thinking, reasoning, etc).
• Ability to walk upright on two legs.
• Free hands with a workable opposing thumb.

The environmental demands had to biological and behavioral changes over a long period of time. In the human brain, the earliest to the most recent structures in the process of evolution are, Limbic system, brain stem and cerebellum are the oldest; and cerebral cortex is the latest developed.