Harperdog writes "This is pretty fascinating: The Chronicle of Higher Ed has an article about a DARPA project that allows researchers to scan satellite photos, video, etc., and have a computer pick up differences in brain activity to tell whether an image has been seen...images that might flash by before conscious recognition. From the article: 'In a small, anonymous office in the Trump Tower, 28 floors above Wall Street, a man sits in front of a computer screen sifting through satellite images of a foreign desert. The images depict a vast, sandy emptiness, marked every so often by dunes and hills. He is searching for man-made structures: houses, compounds, airfields, any sign of civilization that might be visible from the sky. The images flash at a rate of 20 per second, so fast that before he can truly perceive the details of each landscape, it is gone. He pushes no buttons, takes no notes. His performance is near perfect.'"