I found this study facinating. There are individuals that have gone blind who use echolocation to such an acurate level, they can hike and even play some sports. Our hearing detects sound waves, which are a complex pattern of waves bouncing around and off surrounding materials. Echolocation (used by mammals such as bats) is a technique where a series of clicks or sounds are created and the echo of the sound wave is then picked up and translated to information about the environment. It seems this has been adapted by some blind individuals to an impressive level.
The recent study, described in the article below, has used MRI scans to observe how the brain processes the echolocation signals compared to non-blind control participents. the results show that the individuals who used the echolocation processed the information in the visual cortex, in esscence "seeing" the echolocation information. Really amazing!
Skeptical kinkster musing on whatever takes my fancy!