what was the speed of human brain?

Answer 1

10^16 operations per second. You computer may do some 10^10 operations per second, so you need one million computers working together to emulate your brain.

But an elementary operation of your brain is probably not directly comparable to that of a computer, and also you can't use all synapses at the same time. If your CPU has one billion transistors operating at a clock frequency of 4 gigahertz you could say that it has a theoretical capacity of 4*10^18 operations per second which is already 400 times more than your brain.

Answer 2

how many neurons (brain cells) we have, how fast a neuron can fire, and how many cells it connects to. A human being has about 100 billion brain cells. Although different neurons fire at different speeds, as a rough estimate it is reasonable to estimate that a neuron can fire about once every 5 milliseconds, or about 200 times a second. The number of cells each neuron is connected to also varies, but as a rough estimate it is reasonable to say that each neuron connects to 1000 other neurons- so every time a neuron fires, about 1000 other neurons get information about that firing. If we multiply all this out we get 100 billion neurons X 200 firings per second X 1000 connections per firing = 20 million billion calculations per second.
This estimate might easily be off by an order of magnitude- that is, it might be 10 times too high or low. It also is a bit misleading because it estimates the raw 'clock speed' of the brain, which is much higher than the number of real useful calculations we do in a second. An apparently much simpler way to approach the problem is to note that the time it takes for the brain to make a really simple decision- like naming a picture or reading a word aloud- is about 300-700 milliseconds. So we can say that brain can only make about two conscious calculations per second. However, this is also misleading, for a bunch of reasons. One reason is that many well-trained brains can make incredibly complex decisions that quickly. Moreover, even simple tasks like reading a word aloud are actually very complex, actually requiring huge amounts of low-level computation. Finally, note that your brain is doing all sorts of things unconsciously at the same time- maintaining your body and its relation to the world- whenever you are engaged in conscious calculations. So depending on whether you want the raw clock speed, or some higher-level measure of information processing, your question has two answers that differ widely.


It is interesting to put this into the perspective of contemporary technology. The 'clock speed' of a neuron is abysmal by technological standards. The central processing unit in the machine on which I wrote this document has a 1 Ghz. clock speed, which means it runs1000 million clock cycles per second. If we divide 1000 million by 200, we see that the CPU on my computer is 5 million times faster than the clock speed of a neuron. Of course the computational power of our brains comes from the fact that we have a lot of neurons. Nevertheless, the gap between technology and neurons is closing fast. It has been estimated many times by many different people, using uncontroversial projections into the future (the exponential growth curve suggested by Moore's law), that we will have a computer that can process as many bits per second as the human brain within a few decades at most. Soon thereafter, computers will exceed human beings in raw processing power. If you are under 50 years old as you read this, then you can reasonably bet that you will own a cheap desktop computer that will process more information than your brain does before you die (Ray Kurzweil estimates that cheap computers will process this fast by 2023). If you are under 25 years old, there is a good chance that you will own a cheap desktop computer that processes more information than the whole human race (Ray Kurzweil estimates that cheap computers will process this fast by 2049). This does not necessarily mean that the computers will be as intelligent as you or as a small town full of people, since at the moment we have no idea how to program computers to be generally intelligent. But nobody really knows what such computers might be capable of in the long run.


From: http://www.ualberta.ca/~chrisw/howfast.html

Answer 3

Speed of brain is directly related to the human ability.

Which means the more we learn the faster our brain can work.

Also brain works fastest in the age bracket of 1 year to 6 years.

Answer 4

The man acts ( the brain works):
1) usually under logic program,
2) sometimes on intuition (unconsciousness).
============= ======= =============
Brain of a man approximately consists of sixteen milliards neurons.
All of them form the system that manages human body.
That is why, it is of no wonder, that with the work of all the
sixteen milliards neutrons of brain, a man cannot catch a single impulse of
Electron, Quantum of light, his God:
(mass of electron is equal 10^-31 kg., charge of electron is equal 10^-19 k.)
Quantum of light, Spiritual particle, which had created us, turned out to be under control
of the material existence. However, the spiritual particle aspires to establish its supremacy
over material nature. And the possibilities to reign over material nature are limited.
The expansion of the possibilities of the development of spiritual particle is connected
with the creation of specific (vacuum) conditions. These conditions are reached
as a result of constant religious practice.
To perceive the universe, to perceive the spiritual essence, it is necessary
for the man to take possession of religious practice.
PRACTICE. THE GENERAL PRINCIPLES.
We pray the GOD and we do not realize that HE is inside us.
Each of us carries in himself the SPIRITUAL PARTICLE
(QUANTUM OF LIGHT - AN ELECTRON).
But we do not realize that HE is inside us.
Behind the habitual forces of nature there is one force hidden - a spiritual one (h - e).
But ITS action is almost completely disguised with the other forces
(mechanical, electromagnetic, nuclear, chemical and others),
therefore it remains unnoticed in an ordinary processes.
But God never operates outside of natural principles.
There are the processes in which He reveals himself.
Therefore, His disclosing is a technical question.
How can we learn it?
For this purpose it is necessary to create the following effects in our computer-brain:
A). Nonlinear effect
B). Superconducting effect
C). Holographic effect
D). Vacuum effect.
Nobody, except us, can make this technical work.
Only we (by the constant, thin, internal practice) can create conditions for these effects.
This practice has called "a Religious practice".
In this lies an essence of Religion - to establish the communication of a Human being with his Divine origin.
* * *
Our computer-brain works on a dualistic basis.
In a usual daily life all we do is done logically, under an influence of our feelings.
On the other hand, in a religious practice we learn to perceive and to operate:
1) Without the participation of the sense organs.
2) Without the participation of the logic mental processes.
When these conditions will be created, then the opportunity to operate will be given
to a QUANTUM OF LIGHT (AN ELECTRON), to OUR DIVINE ESSENCE.
We will acquire new forces, new abilities.
Once again.
An electron's mass is 10^-28gr . The size is 10^-13sm. A charge is 10^-19k .
With these characteristics it is hard for IT to appear.
Therefore it is clear, why we don't know IT in our ordinary life.
ITS cognition is achieved by a very hard, thin and laborious work.
This work demands of a person to be devoted to it.
===========================
http://www.socratus.com

Answer 5

Very fast
human brain can go to pluto in few sec but normally it takes years.

lol

Answer 6

what do you mean ? speed if dropped from a height? or thrown against a wall? or working out some maths ? or a really stupid person working out some maths?

Answer 7

tell me the speed in what sense

Answer 8

faster than planet earth falling down to the sun

Answer 9

depends on how fast the person moves!!