Human Brain: Human nervous system has two main parts: the
central nervous system and the peripheral nervous system. The central nervous
system is composed of the brain and spinal cord. The peripheral nervous system is designed on the
nerves that carry impulses to and from the central nervous system. In human the
brain is especially large and well developed. During its development the
nervous system undergoes remarkable changes to attain its complex organization.
In order to produce the estimated one
trillion neurons present in a mature brain, an average
of 2.5 million neurons must be generated per minute during the entire prenatal
life. The typical brain of a full-term infant weighs 350 grams (12 ounces) at
birth and about 1,500 grams at adulthood. By the age of 75, the weight of the
brain is reduced from its maximum at maturity by about one-tenth, the flow of
blood through the brain by almost one-fifth, and the number of functional taste
buds by about two-thirds. A loss of
neurons does not necessarily imply a comparable loss of function.
The central nervous system consists of the brain
and spinal cord. The brain is encased in a bony vault, while the cylindrical
and elongated spinal cord lies in the vertebral canal, which is formed by
successive vertebrae connected by dense ligaments. The brain is a relatively
small organ, weighing about 1,500 grams and constituting about 2 percent of
total body weight.
Human Mind is the ultimate entity of life, which receives
and computes all messages transmitted to it by the five senses through the
human brain. Mind is not just another
name for the brain. It transcends the
brain and manipulates its operation.
The mind is the ultimate seat of
consciousness. Deductive logic is the
most amazing faculty of mind. Even when
there are no facts fed to it through senses, it may continue to operate with
hypothetical data or over the previously stored data. All decision making is
done at the level of the mind, while the brain is merely a material hardware, a
storehouse of memory. This enables mind
to contemplate upon metaphysical and scientifically illogical issues like
infinity, eternity and life-after-death. Thus the mind learns to believe in the
unseen entirely through hypothetical exercises, while at other times it
examines material data and draws logical conclusions from them. It can visualize all forms of radiation which
coexist with us, but we cannot learn their presence through our five live
senses. Such images of the mind deduced from hypothetical concepts can be seen
and heard when we transmit them in readable or audible or watchable resources,
like tv, radio or written paper. Many an
unseen meaning is added to the visible scene by the mind, before it is finally
developed into a meaningful concept. A glaring example is the dream we see in
sleep and the world we see awaken.
Spirituality of Human Mind: Our
sense perception is not without error in reaching conclusion of the truth. Our sense
of sight, the strongest in our senses, sees a shadow of a stick or a pillar standing
still and motionless and draws a conclusion that shadows do not move. It proves
wrong when we see the shadow after an hour. Similar is the case of stars in the
night sky. They look equal to a quarter-dollar coin, but in truth, some are bigger
in size than our earth.
The hidden knowledge of the unseen phenomenon
is accessible through revelation and inspiration of human mind. But the faculty of mind and intelligence of
mind have their own limitations too.
Human mind cannot transcend time and space. Hence all such knowledge as lies beyond the
reach of human intelligence can only be reached by means of Divine revelation given
to whomsoever Almighty desires. The Scriptures
guide us saying: “He (alone) knows the Unseen, nor does He make any one
acquainted with His mysteries; Except a messenger whom He has chosen.”
(Q.72:26-27). “Blessed be the name of God forever and ever, For wisdom and
might are His.” (Daniel 2:20).
This exclusiveness of transcendent knowledge
granted to the prophets relates largely to the field of spiritual knowledge and
to the knowledge about life after death. The world of the unknown is limitless and
fathomless, yet man will always be permitted an access to it, but in measured
proportions according limits of time and space of the man concerned.
Human
intelligence is the
intellectual capacity of human being, which is characterized by perception, consciousness, self-awareness, and volition. Through intelligence, man possesses the cognitive abilities to learn, form
concepts, understand, apply logic, and reason, including the capacities to recognize patterns, comprehend ideas, plan, problem
solve, make
decisions, retaining, and use language
to communicate.
Intelligence enables humans to experience and think.
Human
intelligence is the only faculty which is unique to human only. Animals, birds,
fish, reptiles and all such creatures possess the faculties of brain and sense-perception
of mind, but not intelligence. They have full perception how to get their food,
how to survive and how to protect from dangers of their environs. But they
don’t know how to compute scientific or social data to reach to a
conclusion. Brain and Mind can know that
3 is less than 6 but they cannot know what is the relation among different
figures, such as 3, 6, 10, 15, 21 and beyond. This can be computed by
Intelligence only.
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