a universal interest in immortality. In Denial of Death, Becker describes "soul" in terms of Kierkegaard's use of "self" when he says, "what we call schizophrenia is an attempt by the symbolic self to deny the limitations of the finite body." Science According to Julien Musolino, the vast majority of scientists hold that the mind is a complex machine that operates on the same physical laws as all other objects in the universe. According to Musolino, there is currently no scientific evidence whatsoever to support the existence of the soul. The search for the soul, however, is seen to have been instrumental in driving the understanding of the anatomy and physiology of the human body, particularly in the fields of cardiovascular and neurology. In the two dominant conflicting concepts of the soul – one seeing it to be spiritual and immortal, and the other seeing it to be material and mortal, both have described the soul as being located in a particular organ or as pervading the whole body. Neuroscience Neuroscience as an interdisciplinary field, and its branch of cognitive neuroscience particularly, operates under the ontological assumption of physicalism. In other words, it assumes that only the fundamental phenomena studied by physics exist. Thus, neuroscience seeks to understand mental phenomena within the framework according to which human thought and behavior are caused solely by physical processes taking place inside the brain, and it operates by the way of reductionism by seeking an explanation for the mind in terms of brain activity. To study the mind in terms of the brain several methods of functional neuroimaging are used to study the neuroanatomical correlates of various cognitive processes that constitute the mind. The evidence from brain imaging indicates that all processes of the mind have physical correlates in brain function. However, such correlational studies cannot determine whether neural activity plays a causal role in the occurrence of these cognitive processes (correlation does not imply causation) and they cannot determine if the neural activity is either necessary or sufficient for such processes to occur. Identification of causation, and of necessary and sufficient conditions requires explicit experimental manipulation of that activity. If manipulation of brain activity changes consciousness, then a causal role for that brain activity can be inferred. Two of the most common types of manipulation experiments are loss-of-function and gain-of-function experiments. In a loss-of-function (also called "necessity") experiment, a part of the