there have been some studies re time dilation for the observer done in neuro-psych.
a basic idea is that it may be related to the 're-wiring' of the brain when in certain experiences in much the same way that dream states also often have a different temporal perception / time dilation etc.
have a look for papers on the 'web of knowledge'
www.isiknowledge.com/ it has most of the current research literature available.
you may only get access to abstracts if you aren't a uni student,
but often that may also give references to books (which can be read on books.google.com or on amazon in many cases).
try that as a starter for ten.
of course there may also be the case that when entering into 'pure consciousness' mode time doesn't work the same way so the above phenomenological experiments are irrelevant.
equally look at Itzhak Bars concept of 2-T physics which might be interesting to you or lead you in some interesting directions.
http://physics.usc.edu/~bars/research.html