Is time in space/time a linear construct?

[tadeus]

This is related to physical aging, as you aged, the frequency of your brain (during wakeful state) will also become gradually slower (and thus your reaction become slower as well). This makes you perceive hours and days gone by faster.

Then my brain must be very slow,  

At the moment I don't have any access to the memory of my own experience within time/space context, yet the above is my understanding based on Ra's description. They also mentioned that every one will experience time/space context after the death of physical body. (end of one physical incarnation) Time/space reality is used for 'life review and evaluation process'.

and there are moments where i am already dead.

But generally i know what you want to say. Thanks.