For the same reason that a car without an engine will not run.
We have a functioning brain when we are alive. This brain normally has the ability to form memories.
We do not have a functioning brain when we are dead and thus no known way to form memories.
hi Santini, have you read the peer reviewed scientific studies on cellular memory, Memory appears at cellular levels not just in and from the brain itself.
Cellular memory hints at the origins of intelligence
Slime mould displays remarkable rhythmic recall.
Learning and memory — abilities associated with a brain or, at the very least, neuronal activity — have been observed in protoplasmic slime, a unicellular organism with multiple nuclei.
When the amoeba Physarum polycephalum is subjected to a series of shocks at regular intervals, it learns the pattern and changes its behaviour in anticipation of the next one to come1, according to a team of researchers in Japan.
Remarkably, this memory stays in the slime mould for hours, even when the shocks themselves stop. A single renewed shock after a 'silent' period will leave the mould expecting another to follow in the rhythm it learned previously. Toshiyuki Nakagaki of Hokkaido University in Sapporo and his colleagues say that their findings “hint at the cellular origins of primitive intelligence”.
It is well-established that cells receive, interpret and adjust to environmental fluctuations, says microbiologist James Shapiro of the University of Chicago, Illinois. But if the results stand up, he says, “this paper would add a cellular memory to those capabilities”.
The organism chosen by the Japanese team could scarcely seem less promising as a quick learner. Physarum polycephalum is a slime mould belonging to the Amoebozoa phylum. It moves at a steady rate of about one centimetre per hour at room temperature, but this changes with the humidity of its environment. It slows down in drier air, and Nakagaki's team used this sensitivity to stimulate learning. The team found that when the mould experienced three episodes of dry air in regular succession an hour apart, it apparently came to expect more: it slowed down when a fourth pulse of dry air was due, even if none was actually applied. Sometimes this anticipatory slow-down would be repeated another hour later, and even a third.
The same behaviour was seen when the pulses were experienced at other regular time intervals — say, every half hour or every 1.5 hours.
If the dry episodes did not recur after the first three, the amoeba's sense of expectation gradually faded away. But then applying a single dry pulse about six hours later commonly led to another anticipatory slowing in step with the earlier rhythm.
The same team has previously shown that these amoebae can negotiate mazes and solve simple puzzles2,3. So the new finding adds to “the cool things Physarum can do”, says applied mathematician Steven Strogatz of Cornell University in Ithaca, New York.
Like all living organisms, slime moulds have built-in biochemical oscillators, like the human body clock. In other kinds of slime mould, these oscillators can create periodic ripple patterns in response to environmental stress, helping the organism coordinate its movements. Nakagaki's group thinks that the versatile rhythmic sense of Physarum stems from many different biochemical oscillators in the colony operating at a continuous range of frequencies.
The team's calculations show that such a group of oscillators can pick up and 'learn' any imposed rhythmic beat, although the knowledge decays quickly once stimulus ceases. The calculations also show that a memory of the beat can stay within the system, and be released again by a single, later pulse — just as the researchers observed.
Body Memory, is the theory that the body, as well as the brain, is capable of storing memories. Body memory is sometimes cited to explain certain claims of having memories for events where the brain was not in a position to store memories.
Dr. Candace Pert, a professor in the department of physiology and biophysics at Georgetown University, believes "the mind is not just in the brain, but also exists throughout the body." Dr. Pert is an expert in peptide pharmacology. "The mind and body communicate with each other through chemicals known as peptides," she claims. "These peptides are found in the brain as well as in the stomach, muscles and all of our major organs. I believe that memory can be accessed anywhere in the peptide/receptor network. For instance, a memory associated with food may be linked to the pancreas or liver, and such associations can be transplanted from one person to another."*
More On Cellular Memory. New Heart, New Personality,
I am not here to promote nor deny the existence of cellular memory I just find the topic fascinating especially because so many of my readers do. Not long ago The Discovery Health Channel aired a program titled “Transplanting Memories.” http://dsc.discovery.com/
In the show experts explained why they believe in the concept. Georgetown University Professor, Dr. Candace Pert, said she believes the mind is not just in the brain, but also exists throughout the body. “The mind and body communicate with each other through chemicals known as peptides,” she said. “These peptides are found in the brain as well as in the stomach, muscles and all of our major organs. I believe that memory can be accessed anywhere in the peptide/receptor network. For instance, a memory associated with food may be linked to the pancreas or liver and such associations can be transplanted from one person to another.”
Another expert, German neurologist, Leopold Auerbach, discovered over a century ago that a complex network of nerve cells, like those of the human brain, exist in the intestines. And — Professor Wolfgang Prinz, of the Max Planck Institute for Psychological Research, Munich, discussed the “second brain” in Geo, a German science magazine. Prinz said the digestive track is made up of a knot of about 100 billion brain nerve cells, more than found in the spinal cord. The article suggested the cells may save information on physical reactions to mental processes and give out signals to influence later decisions. It may also be involved in emotional reactions to events.
Perhaps all of this explains the many stories on the internet of transplant patients taking on the personalities of their donors.
If you really want to explore this phenomenon I strongly encourage you to read Knowing By Heart: Cellular Memory in Heart Transplants by Kate Ruth Linton in the MONTGOMERY COLLEGE STUDENT JOURNAL OF SCIENCE & MATHEMATICS
Volume 2 September 2003,
Several transplant surgeons have contributed to a theory for cellular memory essentially based on psychological and metaphysical conditions, which Dr. Paul Pearsall has pieced together. Pearsall is a psychoneuroimmunologist, or a licensed psychologist who studies the relationship between the brain, immune system, and an individual’s life experiences. Pearsall calls this theory the “Lowered Recall Threshold” Basically, it suggests that the immunosuppressive drugs that transplant recipients must take are what bring about associations to donor experiences in recipients. Immunosuppressive drugs minimize the chances of rejection of the new, foreign heart by suppressing the recipient’s immune system. Scientists believe these drugs could also possibly act as psychotropic, meaning “acting on the mind.”
Santini a good book to read is Matter and Memory
by Henri Bergson
Bergson is a tad cumbersome to read, but well worth the effort, he argues logically and his theories are based in science. You might be forgiven for assuming he must then conclude that the human mind depends on the brain, and must die when the brain dies, but Bergson argues the mind does not. Both the sciences and reasoning say the mind is related to the brain but never dependant upon it. Bergson wrote this over 80 yrs ago, a great thinker,his work study and books on Matter and Memory remain as valid today as they were radical in his day. He writes this book more on a practical grounded manner than one might expect from other such writers on theories pertaining to a mind outside of matter and he shows the mind and the matter to which he draws his conclusions .