Research overview: mechanics of whisker deflection and stress at the base

When a whisker touches an object, the contact bends the shaft and concentrates mechanical stress at its base, where the follicle receptors sit. This overview surveys the biomechanics of whisker deflection, including how the tapered, flexible shaft transmits forces to the follicle and how the location and direction of contact shape the resulting signal. Modeling whisker mechanics helps explain how cats extract information about an object's position, shape, and texture from the pattern of bending. The survey relates these principles to the follicle-sinus mechanoreceptors that detect the forces. It draws on the broader field of vibrissal biomechanics, much of it studied in rodents but applicable to feline whiskers. Understanding the mechanics at the whisker base clarifies how a simple hair becomes a precise sensor, converting contact forces into the detailed tactile information cats use to navigate and to handle prey at close range.