Speculation on your part?  Do you have a source?  Seems like Col. Coroso had
a similar opinion in his book.... The Day After Roswell.

I'm a former abductee.  Former because I have been a "problem" to them.  They
finaly decided to drop me and I haven't had an experience in almost 6 years
now. I figured that since no one will believe you and scientists and much of
the public think you are crazy then I had no choice but to rely on myself and
take on these beings head on.  I played psychologist.  Made observations and
asked tons of off the wall questions with key questions embeded here in there. 
You know to disarm them. Don't ge me wrong, this was hard work that took me
years.  When they take you, they "zombify" you but you experience brief periods
of clarity.  I trained myself that durring those periods I would try to take in
as much info as possible and force myself to remember.  I also would like to
add that I do not claim to know everything about them.  All of my statements
are based on the current knowledge/observations that I have obtained from them.
It's quite suprising to find out how many vulnurabilites they have and that on
some level they are afraid of us in that they view our brains as superior to
their own versions of such.  That book you mentioned, is it still in print? 
What year was it published?  Does the author have a website?