There is a part of the brain called the occipital lobe, and within this area you will find the visual cortex.
This visual cortex receives, integrates and processes visual information relayed from the retinas of the eyes.
In the mid region of the brain, you will see the hippocampus, the amygdala and the thalamus. Unlike the cortex which does a lot of decision making and logic thinking, the mid region is more primitive – It’s where memories are stored and it is also known as the emotional brain.
The amygdala in the mid brain is the fight or flight response alarm. The hippocampus is where we store memories from the past and part of the role of the thalamus is to release peptides into the blood stream of the body so that we can feel the fear, or the joy, or the sadness, or the excitement when they all occur.
So, we go from taking information from our outside world via our retinas, this information travels to the occipital lobe and gets processed and then that information travels to the emotional brain and as a result, we get an emotional and physical response in the body.
Sometimes, information from the external environment may be so quick and intense, the information goes directly to the emotional brain before your visual cortex is even able to process anything.
Ive heard few describe certain events where they were so angry or afraid and they blacked out, not being able to recall some of the details. This may be a result of the emotional brain reacting before the thinking brain even had a chance to process the information and intervene with logic.
This all happens so quick, but the amazing thing about the brain is that it gives us the illusion that everything in reality is happening in sync with each other.
You start walking and you feel the floor beneath you, you hear the steps as your feet hit the ground and you can see your feet moving and hitting the ground. To you, all of this is happening in complete sync – this is another one of the minds illusions.
Whatever you experience through your senses is not entirely reality, but rather your brains representation of its external environment.