Science and medicine seek naturalistic accounts of the observable natural world. This stance is known as methodological naturalism[8], which is silent on the question of whether non-material or supernatural entities, such as the soul, can or do exist as distinct from natural entities. Scientists, therefore, investigate the soul as a human belief or as concept that shapes cognition and understanding of the world (see Memetics), rather than as an entity in and of itAn oft-encountered analogy is that the brain is to the mind as computer hardware is to computer software. The idea of the mind as software has led some scientists to use the word "soul" to emphasize their belief that the human mind has powers beyond or at least qualitatively different from what artificial software can do
The concept of the soul has strong links with notions of an afterlife, but opinions may vary wildly, even within a given religion, as to what may happen to the soul after the death of the body. Many within these religions and philosophies see the soul as immaterial, while others consider it to possibly have a material component, and some have even tried to establish the mass (or weight) of the soul. The soul, according to many religious and philosophical traditions, is the self-aware essence unique to a particular living being. In these traditions the soul is thought to incorporate the inner essence of each living being, and to be the true basis for sapience. It is believed in many cultures and religions that the soul is the unification of one's sense of identity. Souls are usually (but not always as explained below) considered to be immortal and to exist before their incarnation in flesh.
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