Interesting. Should that ever be possible that would be an
  amazing achievement. I tend to think they'll use some standard
  psychological memory tests on animals they test with; boring
  regular memory tests. If it shows they have significantly better
  recall rate, then eventually they'll use that on human and do
  the same boring psychological testing procedures.

  Symbolic interpretation _might_ follow as an auxiliary line of
  research but I don't think it's required for an effective
  solution to memory problems or memory enhancement.
  Interpretation can be wholly external and ethically, it's likely
  that it will be.. for the most part; mostly because
  interpretation isn't necessary for effective deployment.