The discussion of xeno-psychology is interesting. Robert Freitas discussed the issues in a number of articles in the early 1980s...

“Xenopsychology,” Analog 104(April 1984):41-53
http://www.rfreitas.com/Astro/Xenopsychology.htm

plus a good one on xenobiology...

“Xenobiology,” Analog 101(30 March 1981):30-41
http://www.xenology.info/Papers/Xenobiology.htm

...surprisingly not as dated as you might think. Freitas also argued strongly against the skeptics who believed there were no signs of ETs in our Solar System, therefore They didn't exist. He rightly pointed out the current search was incomplete - and it still is. Now it's even more complicated because we know a lot more about optics and making things invisible - at least in theory.