Soul dualism, also called dualistic pluralism or multiple souls, is a range of beliefs that a person has two or more kinds of souls. In many cases, one of the souls is associated with body functions ("body soul") and the other one can leave the body ("free soul" or "wandering soul"). Sometimes the plethora of soul types can be even more complex. Sometimes, a shaman's "free soul" may be held to be able to undertake a spirit journey. AituAnito and Atua The belief in soul dualism found throughout most Austronesian shamanistic traditions. The reconstructed Proto-Austronesian word for the "body soul" is *nawa ("breath", "life", or "vital spirit"). It is located somewhere in the abdominal cavity, often in the liver or the heart (Proto-Austronesian *qaCay). The "free soul" is located in the head. Its names are usually derived from Proto-Austronesian *qaNiCu ("ghost", "spirit [of the dead]"), which also apply to other non-human nature spirits. The "free soul" is also referred to in names that literally mean "twin" or "double", from Proto-Austronesian *duSa ("two"). A virtuous person is said to be one whose souls are in harmony with each other, while an evil person is one whose souls are in conflict. The "free soul" is said to leave the body and journey to the spirit world during trance-like states, sleep, delirium, death, and insanity. The duality is also seen in the healing traditions of Austronesian shamans, where illnesses are regarded as a "soul loss" and thus to heal the sick, one must "return" the "free soul" (which may have been stolen by an evil spirit or got lost in the spirit world) into the body. If the "free soul" can not be returned, the afflicted person dies or goes permanently insane. In some ethnic groups, there can also be more than two souls. Among the Tagbanwa, a person is said to have six souls - the "free soul" (which is regarded as the "true" soul) and five secondary souls with various functions. Traditional Chinese culture differentiates two hun and po spirits or souls, which correlate with yang and yin respectively.