E-Mail IMAGE: Mechanics is key to whisker tactile sensation. When a whisker is deflected, its deformation profile within the follicle determines the activity of different groups of mechanoreceptors. view more Credit: Northwestern University/Nadina Zweifel We know your cat's whiskers are handsome -- but you can't even see the cool part. The base of the whisker, which is responsible for sending touch signals to the brain, is hidden inside the follicle, a deep pocket that embeds the whisker within the skin. Because this section of the whisker is obscured, understanding precisely how whiskers communicate touch to the brain has been a longstanding mystery.