Scary or sensational? A machine that can look into the mind

The answer is quite definitely both, in my opinion:

Scientists have developed a computerised mind-reading technique which lets them accurately predict the images that people are looking at by using scanners to study brain activity.

The breakthrough by American scientists took MRI scanning equipment normally used in hospital diagnosis to observe patterns of brain activity when a subject examined a range of black and white photographs. Then a computer was able to correctly predict in nine out of 10 cases which image people were focused on. Guesswork would have been accurate only eight times in every 1,000 attempts.

The study raises the possibility in the future of the technology being harnessed to visualise scenes from a person's dreams or memory.

From the Guardian. As a way of understanding the human brain, this is huge... but the implications for our civil liberties are pretty huge too. To their credit, the researchers acknowledge this:

However the team have warned about potential privacy issues in the future when scanning techniques improve. "It is possible that decoding brain activity could have serious ethical and privacy implications downstream in, say, the 30 to 50-year time frame," said Prof Gallant. "[We] believe strongly that no one should be subjected to any form of brain-reading process involuntarily, covertly, or without complete informed consent."

It remains to be seen how societies will cope, if this technology takes hold.