Western ears consider a pitch at double the frequency of a lower pitch to be the same note, an octave higher. The Tsimane’, an indigenous people in the Bolivian Amazon basin, do not. “If you only test ...

Optical illusions manipulate your brain's visual perception, leading you to perceive something different from reality. This occurs through a process called "perceptual filling-in" where your brain ...

Are you a true music lover? Take this optical illusion test to find out! In this image, there is a hidden musical note waiting to be discovered. Can you find it in 17 seconds? Optical illusions are a ...