The human equivalent of purring is often considered to be humming. When humans hum, they produce a low-pitched, continuous sound by vibrating their vocal cords. This humming sound is typically made while exhaling, and it can vary in pitch and volume.
Humming is a common behavior among humans and can serve various purposes, including relaxation, self-soothing, expressing contentment, or simply enjoying music. Similar to how a cat purrs to communicate comfort or contentment, humans may hum in situations where they feel relaxed or happy.
However, it's important to note that while purring is a natural behavior in cats and serves as a form of communication, humming in humans is not a direct equivalent in terms of function or communication. Humans have a diverse range of vocalizations and expressions to convey emotions and communicate, while purring remains a unique and distinctive feature of certain animals like cats.