And automatic background subtraction, it turns out, can also manifest in intriguing, unexpected ways. Take a counterintuitive finding that Tadin and his colleagues made in 2003: We’re good at perceiving the movements of small objects, but if those objects are simply made bigger, we find it much more difficult to detect their motion. [...]
The team further confirmed this idea with a training experiment conducted in older adults. Other researchers had previously reported that there’s not much difference between how well seniors observe the motion of a small object and the motion of a larger one. Because of this, Tadin and his colleagues predicted that older people would have problems spotting small moving objects against a moving backdrop—and that’s exactly what they found. Still, with a few weeks’ training, the test subjects got much better at recognizing that motion.
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