I know that under some conditions time runs slower or faster depending on the speed we have relative to an inertial frame of reference. However if I understand correctly for an observer that is moving with say 90%c though time runs much faster, for him the time runs in a normal way (I mean he doesn't experience the reality around him like in fast forward motion in a video play, he experiences like time is ticking in a normal way). Is it possible to create a situation where one observer experiences the reality around him like it is in slow motion or like it is in fast forward? Does this have to do with relativity or it is something that has to do with substances that affect the function of our brain and our senses? And if we reach 100%c does time completely stops?