Human behavior is individuality and need induced.

Our behavior never remains same on every time. It varies place to place and time to time in the same individual. It's a known thing by all. Did you think just a while from what our psyche induce. If our perception plays a major role then why it varies yet our cognition increases at a same pace.

If the behavior induces by learning then it should also increase in a progressive way.

Its both may be a reason but not executive of our brain. Our behavior is totally individuality and need induced. Thinking, perception, learning and all cognition play a major role but the need of the time and place is also important for behavior.