Scientists Discover a “Shy” Plant That Can Count Without a Brain, and It May Be Smarter Than We Thought

A plant with no brain, no neurons, and no nervous system appears to count. That is the central finding by William & Mary psychology professor Peter Vishton and his former student Paige Bartosh.

Scientists Discover a “Shy” Plant That Can Count Without a Brain, and It May Be Smarter Than We Thought. A plant with no brain, no neurons, and no nervous system appears to count. That is the central finding by William & Mary psychology professor Peter Vishton and his former student Paige Bartosh. Working with Mimosa pudica, commonly called the shy plant or touch-me-not, the researchers found that the plant’s leaf movements were shaped not simply by time, but by the number of light-and-dark cycles it had experienced. The study, published in Cognitive Science in late 2025, presents what the authors describe as the first evidence that plants can enumerate, meaning they can distinguish and track discrete events in their environment. That capacity was previously assumed to require a nervous system. Mimosa pudica folds its delicate, feathery l...