![]() ![]() ![]() This hard limit has hampered the ability to interpret brain activity in response to natural speech because it gives a “mishmash of information” spread over a few seconds. “It’s this noisy, sluggish proxy for neural activity,” said Huth. The lag exists because fMRI scans measure the blood flow response to brain activity, which peaks and returns to baseline over about 10 seconds, meaning even the most powerful scanner cannot improve on this. The achievement overcomes a fundamental limitation of fMRI which is that while the technique can map brain activity to a specific location with incredibly high resolution, there is an inherent time lag, which makes tracking activity in real-time impossible. I’ve been working on this for 15 years … so it was shocking and exciting when it finally did work.” Dr Alexander Huth, a neuroscientist who led the work at the University of Texas at Austin, said: “We were kind of shocked that it works as well as it does. ![]()
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