Forgetfulness.  Where do the thoughts go which you are trying to remember?  They are still there.  Thoughts are energy.  They do not go away.  You must merely place the intention of matching the frequency of the concept you are trying to remember and send that intention outward.  It will catch the intended thought as a fly to flypaper.  You need simply let the intention do its job.

 Do you wave flypaper around hoping to catch a random fly?  What a sticky mess that would make!  No. Once hung out there, you simply relax and allow it to work.  When that which you are hoping to attract is caught you will know it.  Do you see how it works?  The thoughts are no more in your brain than a fly is.  They are buzzing around like the energy you hear crackling in high wires, for all is one great hive of energy.