[Karlozkiller]

Brain scans are not as accurate as one might think. Most or all methods merely show activation of neurons or groups of neurons over a timescale.

Typically you give a person, say a memory task, you look at which areas fire up as he tries to memorise a word list and from that you extrapolate whatever you can from it. I also believe working memory and short term memory are to some extent better understood than long term memory. actually the least known process regarding memory I think is how memories pass from working memory or short term memory into long term memory.

[posterboy]

I didn't express clearly. They scanned the brain and recreated some part of what the person sees.

1. http://news.berkeley.edu/2011/09/22/brain-movies/

2. http://gallantlab.org/_downloads/2011a.Nishimoto.etal.pdf

Spoilers: It is fMRI, indeed.

I'm not sure if the scan is inaccurate or the representation within the brain, but I suppose it had to be more accurate than just a fuzzy area.