Perception of eternalism
Feelings of eternalism can be described as a drastic alteration in one's perception of the flow of time. During this mind state, it feels that all events or points across the timeline of existence are equally "real" and occurring simultaneously, perpetually and eternally alongside of each other. This is in stark contrast to the commonly held perception of daily living which feels as if it is only the present that is "real" whilst the past is over and the future is yet to manifest.
The experience of this component results in feelings of time as just another physical dimension which has no objective or directional flow. Despite this, however, it does not allow one to directly connect their experiences and memories to future events which have not yet occurred. This is simply because (despite the apparent illusory nature of past, present and future) cause and effect is still in place and thus logic dictates that we can only experience life one frame at a time using information which was previously acquired from prior events.
A near universal conclusion that one may reach during the experience of this state is that although one's life will inevitably end, it will occur forever within its own time frame and is therefore perpetual despite not being infinite in length.
Psychoactive substances
Compounds within our psychoactive substance index which may cause this effect include: