Why did Nature feel the need to give us each a personal alarm, a survival instinct?
Collins Dictionary defines the 'survival instinct' as, "the instinct in humans and animals to do things in a dangerous situation that will prevent them from dying"
From the moment of birth our senses - sight, hearing, touch, smell and taste - are picking up information from our environment. If we were fully consciously aware of all this information, we'd have brain overload!
How we avoid brain overload
Think for a moment how often we deliberately cut off some of this information so as to focus on one sort of input specifically. For instance, we may close our eyes in order to concentrate on sound while listening to music.
When eating something special we may close our eyes in order to focus on the taste. We often have to deliberately cut off some of the information that's being picked up so that we can concentrate on the bits we want.
To the Survival Instinct everything is relevant
But, as far as nature is concerned, it could be dangerous for us to cut off certain bits of information in this way because we might miss some danger that's approaching. So nature built into each of us an alarm system.
To the alarm system the world is a big, potentially dangerous, place. It works a bit like the intruder alarm monitors in some homes.
It watches what's going on so as to spot danger even before we become consciously aware of it and alert us to it before it gets us. That's its job. And it works really well, albeit too well in many cases. But how does it know what's dangerous?
To the alarm system everything is dangerous until proved otherwise
Therefore anything that has caused us to feel negative arousal in the past, anything that previously made us feel pain, afraid, embarrassed, or anxious sets the alarm off and it butts in to whatever we're doing and draws our attention to what it believes is the danger.
Imagine you are sitting in a lecture when a window cleaner walking by the window drops his ladders.
The ladders make a loud clattering sound as they fall.
Everyone in that class will most probably be startled and turn to look where the noise came from, to see what made it. They don't choose to do that consciously - it's an automatic response - that's the work of the survival instinct.
There are two categories of things that will usually trigger this alarm system.
But first it is best to understand the mechanism which nature gave us to escape from real life and death situations, the fight or flight response.