1. The sensory awareness of bodily feelings including awareness of positions, skin senses, unconscious perceptions of movements and spatial orientations coming from stimuli within the body itself, including the internal organs: Gabriel lost his sense of somaesthesis when he participated in the space center experiment of weightlessness.
2. The sensory perceptions of bodily feelings like touch, pain, position of the limbs, etc.: Nancy used her sense of somaesthesis to orient herself while climbing the curved stairway.

Mr. Gibson, the biologist, said that somaesthesis is spread through all major parts of a mammal's body and of other vertebrates.