GOD: THE FAILED HYPOTHESIS - How Science Shows That God Does Not Exist. VICTOR J. STENGER
BRAIN SCIENCE TODAY
Scientists no longer need to remove the brain from a dead body in order to study it. Imaging technology makes it possible not only to examine brains in detail but also to observe them while they are still alive and functioning. In recent years, this has enabled the sources of perceptual judgments and different types of thought to be located within the brain. Experiments have been conducted in which subjects are asked to make mechanical, intellectual, and moral choices, while researchers watch the brain carry out the necessary operations.
A number of imaging techniques have been developed with modern technology. Perhaps the most powerful is magnetic resonance imaging (MRI). Based on the physics of nuclear magnetic resonance (NMR), with the word "nuclear" removed so as not to alarm patients, MRI forms an image by detecting the energy that is released by the spinning nuclei of atoms. This energy is actually very low, coming from the radio region of the electromagnetic spectrum and not at all harmful—especially compared to x-rays, which have sufficient energy to break atomic bonds. In functional MRI (fMRI), the magnetic properties of the blood are used to see patterns of blood flow. An fMRI scan of the brain can quickly produce images that distinguish structures less than a millimeter apart and pinpoint areas in the brain that are being activated.
Other brain imaging techniques include positron emission tomography (PET), single photon emission computed tomography (SPECT), and electroencephalography (EEG). All these techniques confirm that thought processes are accompanied by localized physical activity in the brain. Let us look at just a few of the examples relevant to our discussion. Many more can be found in the literature.
Using fMRI, scientists in the United States and Brazil have discovered that the region of the brain activated when moral judgments are being made is different from the region activated for social judgments that are equally emotionally charged. Princeton researchers have studied the brain activity in people asked to make decisions based on various moral dilemmas. These dilemmas were divided into two categories—one involving impersonal actions and another where a direct personal action was required. The brain scans consistently showed greater activation in the areas of the brain associated with emotions when the actions were personal. The relevant point here is not just that physical processes in the brain take part in thinking; they seem to be responsible for the deepest thoughts that are supposed to be the province of spirit rather than matter. Another area of study with live brains involves the localized stimulation by electric or magnetic pulses. Neuroscientist Michael Persinger claims to have induced many of the types of experiences that people have interpreted as "religious" or "spiritual" by magnetic stimulation of the brain. However, Persinger's results have been called into question.
On the other hand, Olaf Blanke and his colleagues report that they are able to bring about so-called out-of-body experiences (OBE), where a person's consciousness seems to become detached from the body, by electrical stimulation of a specific region in the brain. I have discussed OBE experiments in twobooks and have concluded that they provide no evidence for anything happening outside of the physical processes of the brain.
These results do not totally deny the possibility that conscious thoughts are being directed by a disembodied soul, which then somehow implements them through the brain and nervous system. This, in one form or another, remains the teaching of most religions. In 1986 Pope John Paul II reaffirmed the 1950 statement by Pope Pius XII that the Church does not forbid the study and teaching of biological evolution. However, the pope made it very clear that evolution applied to the body—not the mind: "Theories of evolution which, in accordance with the philosophies inspiring them, consider the spirit as emerging from the forces of living matter, or as a mere epiphenomenon of this matter, are incompatible with the truth about man. Nor are they able to ground the dignity of the person."
Despite the Holy Father's admonition, a wealth of empirical data now strongly suggests that mind is in fact a "mere epiphenomenon of this matter." Matter alone appears to be able to carry out all the activities that have been traditionally associated with the soul. No "spiritual" element is required by the data. The implication that "we" are bodies and brains made of atoms and nothing more is perhaps simply too new, too disturbing, too incompatible with common preconceptions to be soon accepted into common knowledge. However, if we do indeed possess an immaterial soul, or a material one with special properties that cannot be found in inanimate matter, then we should expect to find some evidence for it.
Chapter 3 - p.82 - p.84