Slow, deliberate touch at speeds between 1 and 10 cm/s, with optimal resonance around 3 cm/s, activates C-tactile afferents and projects to the Posterior Insular Cortex for interoception and emotion processing.

“the brain classifies the speed of touch, interpreting movements between 1 and 10 centimeters per second as signals of emotion and connection, with an optimal resonance around 3 cm/s. This range activates C-tactile (CT) afferents which are unmyelinated nerve fibers tuned specifically to slow, gentle stroking. When touch moves too quickly, the brain registers sensation but not intimacy. When it is slow and deliberate, it is encoded as closeness, safety, and desire, initiating the cascade of biological processes that prepare the body for sexual connection. The added benefit is that these fibers bypass the primary somatosensory cortex (where you’re touched) and project to the Posterior Insular Cortex, which processes interoception and emotion.”