Critical flicker fusion (CFF), a measure of visual processing speed, predicts executive function in younger and older adults and may be helpful in predicting decline in executive function, say ...

Test your observational prowess with a quick optical illusion! You have just five seconds to locate the number 76 hidden within a grid of 67s. This ch ...

A simple visual test is surprisingly accurate at predicting IQ, according to new research. The study, published today (May 23) in the journal Current Biology, found that people's ability to ...

A viral optical illusion challenges users to find a hidden rat in under 15 seconds, with most failing despite repeated ...

Test your eyesight with a visual puzzle. Spot two hidden numbers, 92 and 29, among many 26s. You have only 8 seconds. This challenge sharpens your focus and concentration. Optical illusions trick the ...