Identifying Non-Classical Sensory Systems

In addition to the five traditional senses, humans possess a range of other sensory systems that help us navigate and understand our environment. One such system is the vestibular system, which plays a critical role in our sense of balance and spatial orientation. This system works in conjunction with our inner ear structures to help us maintain equilibrium and navigate through different physical spaces. Given this information, which additional sensory system is not part of the classical senses but is important in our perception of the physical and social world?