We are born with 100 billion neurons and by age three each neuron has formed 15,000 connections with other neurons. We are given more connections than we will ever need.   We absorb each new bit of information but none of it makes sense to us. The abundance of connections causes us to be overwhelmed by too many signals from many different sources. To make sense of your world you have to shut out some of the noise in your head. 

By the time we are sixteen pruning occurs and we lose billions and billions of the synaptic connections. Your genetic inheritance and early childhood experiences assist you in finding some connections smoother and easier to use. You are drawn to these connections again and again and they become stronger. These signals are loud and clear.

Certain behaviors and reactions fit and feel right to you because of these stronger connections. The neuronal network gets reduced to a smaller number of connection so you will develop into an adult. Without the pruning process we would remain in sensory overload stuck as a child. 

What makes each of us unique is our network of mental connections. This creates and causes a recurring pattern of thoughts, feelings and behaviors. Our personal mental network is a filter for us to sort and sift our experiences so we can zero in on some stimuli and ignore others. 

Brain cell development starts at 42 days after conception. The first brain cell called a neuron fires. Approximately 9,500 new neurons are created every second till there are 100 billion neurons. We are born with 100 billion neurons and have that many till late middle life.  

Sixty days before your birth your neurons start trying to communicate with each other. That communication is a reaching out as a strand called an axon. When a connection is made, a synapse is formed. By the age of three each of the 100 billion neurons have formed 15,000 synaptic connections. That’s 15,000 for each of your 100 billion neurons. For example, from 16 months to 36 months there is a big burst of language and cognitive competence. The child goes from knowing a total of 5-10 words to gaining 1-2 words every day. 

The stronger the neuron connection, the faster the processing. We learn because our neurons are connected. Each time we learn something new, our brains are changed. The patterns of woven connections is extensive, intricate and unique.