Polydactyly is the most common congenital digital anomaly of the hand. The three types of this condition are: (1) type I, in which the extra finger is a soft small tissue segment (post-axial nubbin); ...

Through trial-and-error learning, participants embodied the hand-to-screen mapping, which led them to perceive certain cursor movements as more reflective of their own actions. ©2025 Tanaka et al.

The reason we humans have fingers today may all be thanks to a fish's clacker. New research into the origins of digit formation shows that the DNA switch controlling finger and toe development got its ...