Hmm, a trip to Greece, that sounds fun!
The single largest inhibiting factor is that we cannot experience anything outside ourselves. If we could really tap into the consciousness and be able to measure things like we can the material world, to share those measurements with others in an absolute manner with a common baseline, I think it would be considerably easier to determine cause and effect in the human mind.
In our 'soft sciences' such as psychology there is this inability to find a common baseline between individuals. My 'good' or 'pleasure' is not necessarily grounded on the same baseline as yours. Your experiences seem to determine your baseline for definitions of moods and the idea of experiences (qualia). There is no way to prove that the way you see red is actually the same way I see red, we can look at something and we can both say it is red, but that doesn't mean that we actually interpret it the exact same way, for you red may seem completely different from my own, but we are both consistent in our own subjective experiences. I can never 'see what you see' or see through your mind, so we can never form that baseline.
So these psychologists have to constantly ask "how do you feel" because they have no other way of measuring someone's experience. They attempt to find personal details becaues that helps to form an overall baseline of what you have experienced and gives a better understanding of how you compare and contrast to others, so that inductive reasoning can be created. In the hospital they have charts to determine pain based on the face you make, this is a perfect example of qualia. Someone that hasn't been tortured might have a VERY different idea of what INTENSE pain is from someone else that hasn't anything even close to torture.
Protagoras stated that man is the measure of all things, and that makes sense. The person that was tortured may have a better understanding of a full spectrum of pain than someone who hasn't suffered that same experience. Yet that doesn't mean that someone can't suffer terror or a panic attack from an extremely less level of pain because that is the scope of the spectrum of pain they have experienced. The ideas between eliciting an emotional response based on your interpretation of something is in no way, shape or form the same as someone else's.
It will remain that way until technology advances far enough to truly monitor the thoughts inside someone else's head. Perhaps that isn't even possible with technology, that all depends on what truly drives the conscious mind, I don't believe it is simply chemicals in the brain, although I do believe it could be a combination of memory, intellect, emotion, etc. I would really like to find if intuition is truly capable of being reproduced by means of materialistic resources. Even more interesting is whether that capability of intuition could surpass that of us; such is the basis of any AI apocalyptic movie.