Humans have a highly developed brain, the most developed of all species on earth. The brain which has about 100 billion neurons processes information at a very high speed. But no matter how fast, time is lost between when a sensor such as a nerve senses a change in your environment and when the brain interprets that change to you.
Sight is one of the senses humans have to enable them see and know what is happening around them at a particular time. You know what is happening around you now because you can see it. The sensation of sight comes about when light meets your retina stimulating the rod and cone cells and the information is sent via the optic nerve to the visual cortex of the brain ( the part of the brain responsible for interpreting vision).
You see objects because light reflects off those objects into your eyes to create sight and you don't see in a completely dark room because there's no light to reflect off anything into your eyes.
The light travelling to your eye takes time and the brain interpreting visual stimuli takes time also, in fact, scientists believe that it takes the brain 100 milliseconds to interpret visual stimuli. In the case of the former, take for instance, the sun rises and you look at it. Due to the distance between the sun and earth, the light from the sun takes 8 minutes to reach you. So what you see is exactly how the sun looked like 8 minutes ago but you won't blame your brain for interpreting the sun's "past" for you as your "now" because that was when the light hit your eyes to enable you see. So in looking at celestial bodies like the sun, moon and other planets, there is no "now". You are always behind in its past. What you see in your "now" is not it's "now", in fact, you don't ever see its "now".
In normal day-to-day life, imagine you sitting close to a friend and you see the person nodding his/her head and then suddenly stops. Your brain takes time, though so little to interpret what you are seeing. So did you really see the person the exact moment he/she stopped nodding?. That exact moment would be a bit behind by the time your brain interprets it.
The phenomenon tends to be a little bit more pronounced when you imagine an object travelling towards you at supersonic or hypersonic speed. You look at the object and your brain tells you the distance it is from you. It is still moving very fast so with the time your brain takes to interpret, it has moved past the point your brain is telling you it is. In situations like this, it is believed that your brain predicts where it should be by knowing where it is. So your brain predicts the future to keep you on par with time.
In the real sense, do we see "now" when it is actually "now"?.
Content created and supplied by: OnuhAttah (via Opera News )