Brain, Mind, Consciousness and Learning: Human brain

Showing posts with label Human brain. Show all posts

Wednesday, April 15, 2009

Brain Economic and Moral Choices

The brains is the central organ where most of our decisions are made. It has been a mysterious organ because we could not look inside the brain to observe how we actually make decisions.

There were many old models those divided the decision making mainly into two separate processes. The rational goal oriented decision making process and the irrational emotion based decision making process sometimes referred to as "Animal Spirits". All the attempts that are made to civilize humans were to suppress the irrational decision making and promote rational decision making. The modernity was based upon the ascension of the rational decision making to the highest pedestal while our instinctual urges were considered bad and relegated to the bottom of the pyramid of the needs.

This two part division provided a satisfactory explanation for our behavior in the past. It also provided guidelines for developing suitable methods to train kids to become rational functioning adults. However, the recent advances in non invasive brain scanning techniques such as FMRI allow us to probe inside the brain while it is trying to make decisions. The technique still lacks fine spatial and temporal resolution but it is getting better with time and it provides a glimpse of inside working of human brain.

The neurons inside the brain are interconnected and we do not find a clear cut distinction between two types of decision making. In fact both of them are involved in all types of decision making. This invalidates the "Rational Actor" model of humans used in Economic theory. Human are not purely rational decision making computers.

We now have new disciplines like Neuro-economics and Behavioral Finance. These disciplines have shown that our decisions differ sometimes considerably from a pure rational actor. All decision are value based decisions including the decisions involving money and morality.

Here is a fascinating video that shows some of the experiments in the field of Neuro-economics showing human decision making and a neuroscience based explanation

We can not find a moral center within the brain making moral decisions. Also, we can not find 'Homo Economus nuclei " within the brain making rational informed decisions on money matters purely out of self interest. This conclusion is fairly obvious to common people but the religious authorities and the big name economists so far are not willing to accept these findings in Neuro-economics despite the mounting evidence supporting the idea that brain is an organic unit and it acts as a single unit to perform calculations leading to making decisions.

Thursday, February 19, 2009

Leadership and Social Intelligence

Image via Wikipedia

Daniel Goleman is an internationally renowned psychologist. He is the author of one of the best selling book "Emotional Intelligence". This book was instrumental in bringing back the role emotions play in our day to dealing with people. It identified emotional intelligence as one of the keys in promoting harmonious relation among people and groups. Also its role in improving the learning abilities of the troubled kids.

He has extended his ideas to include "Social Intelligence". He talks about the role of leadership and how biology plays an important role in creating effective leaders.

The notion that effective leadership is about having powerful social circuits in the brain has prompted us to extend our concept of emotional intelligence, which we had grounded in theories of individual psychology. A more relationship-based construct for assessing leadership is social intelligence, which we define as a set of interpersonal competencies built on specific neural circuits (and related endocrine systems) that inspire others to be effective.Source: Social Intelligence and the Biology of Leadership

The studies in Social Neuroscience is revealing the inner working of the human brain. They are also studying the attributes that some one a good leader. It seems that good leaders show a good deal of empathy towards the people. There is a mirroring effect between the good leaders and the followers. This also highlights the role mirror neurons play in establishing emphatic relationships.

Perhaps the most stunning recent discovery in behavioral neuroscience is the identification of mirror neurons in widely dispersed areas of the brain. Italian neuroscientists found them by accident while monitoring a particular cell in a monkey’s brain that fired only when the monkey raised its arm. One day a lab assistant lifted an ice cream cone to his own mouth and triggered a reaction in the monkey’s cell. It was the first evidence that the brain is peppered with neurons that mimic, or mirror, what another being does. This previously unknown class of brain cells operates as neural Wi-Fi, allowing us to navigate our social world. When we consciously or unconsciously detect someone else’s emotions through their actions, our mirror neurons reproduce those emotions. Collectively, these neurons create an instant sense of shared experience.Source: Social Intelligence and the Biology of Leadership

The leaders and followers almost mirror each others body language when the two are in full agreement over the course of future action to move the organization forward.

Wednesday, December 24, 2008

Gut Feelings: The Intelligence of the Unconscious

A sketch of the human brain by artist Priyan W...

Image via WikipediaDr. Gird Gigerenzer is a German Psychologist who studies "Bounded rationality" and produces evidence about the human decision making based upon Intuition.

"Gigerenzer, a leading expert and author on heuristics, won the AAAS Prize for the best article in the behavioral sciences. He is the author of Calculated Risks: How To Know When Numbers Deceive You, the German translation of which won the Scientific Book of the Year Prize in 2002. His books on heuristics include Bounded Rationality: The Adaptive Toolbox, with Reinhard Selten, a Nobel laureate in economics - UCSD

Acccording to the speaker, human beings tend to think of intelligence as a deliberate, conscious activity guided by the laws of logic. Yet, he argues, much of our mental life is unconscious, based on processes alien to logic: gut feelings, or intuitions. Dr. Gigerenzer argues that intuition is more than impulse and caprice; it has its own rationale. This can be described by fast and frugal heuristics, which exploit evolved abilities in the human brain. Heuristics ignore information and try to focus on the few important reasons. Says Gigerenzer: "More information, more time, even more thinking, are not always better, and less can be more."

Here is his talk on Fora.TV

Tuesday, July 29, 2008

Brain Neurons: How They Work

Image by azizul hadi via FlickrThe interconnection of Neurons also known as nerve cells creates a massively parallel computer that is responsible for processing all our sensory data. It also holds information in memory cells for later recall.

It is convenient to compare the neural processing of information in the brain to the information processing in a computing device. However, the two of these devices process information in a very different manner. The computer is good at crunching numbers and working with the binary representation of the symbols. The computer can hold massive amount of information on storage devices. Human brain is not very good either at storing vast amount of information or doing quick number crunching. Its main strenght lies in being an excellent pattern recognizer. It can recognize things even if the presented with incomplete information. This observation has lead to the development of an area in computing also known as Neural Computing in which approximate model of neural network are simulated on a computer.

This short video shows a beautiful animation of neurons in the brain. How they are connected and how they function.

Brain Facts

The adult human brain weighs about 3 pounds (1,300-1,400 g).

The adult human brain is about 2% of the total body weight.

The average human brain is 140 mm wide.

The average human brain is 167 mm long.

The average human brain is 93 mm high.

The human brain has about 100,000,000,000 (100 billion) neurons.

The total surface area of the cerebral cortex is about 2500 sq. cm (~2.5 ft²)

Neurons multiply at a rate 250,000 neurons/minute during early pregnancy.

The weight of an adult human cerebellum is 150 g.

There are 12 pairs of cranial nerves.

There are 31 pairs of spinal nerves.

There are about 13,500,00 neurons in the human spinal cord.

The total number of human olfactory receptor cells is about 40 million.There are 1,000 to 10,000 synapses for a "typical" neuron.

The cell bodies of neurons vary in diameter from 4 microns (granule cell) to 100 microns (motor neuron in cord).

Monday, June 30, 2008

Brain Rules by Dr. John Medina

Image via Wikipedia"Brain Rules" is a book by molecular biologist Dr. John Medina, who is also a blogger. He gave an interview to Harvard Business review on "The Science of Thinking Smarter".

Dr. Medina uses his expertise and experience he has acquired over the years from his research work in molecular biology dealing with brain's functioning to formulate 12 cardinal rules to succeed in work, school and at home . The rules are:

EXERCISE | Rule #1: Exercise boosts brain power.
Evolution SURVIVAL | Rule #2: The human brain evolved, too.
WIRING | Rule #3: Every brain is wired differently.
ATTENTION | Rule #4: We don't pay attention to boring things.
SHORT-TERM MEMORY | Rule #5: Repeat to remember.
LONG-TERM MEMORY | Rule #6: Remember to repeat.
SLEEP | Rule #7: Sleep well, think well.
STRESS | Rule #8: Stressed brains don't learn the same way.
SENSORY INTEGRATION | Rule #9: Stimulate more of the senses.
VISION | Rule #10: Vision trumps all other senses.
GENDER | Rule #11: Male and female brains are different.
EXPLORATION | Rule #12: We are powerful and natural explorers.

These rules reinforce the existing common sense rules of good living like exercising, sleeping well and reducing the stress. Some of these rules can act as guidelines for developing successful elearning modules like rule#10.

Here is a beautiful slide presentation emphasizing these rules.

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His talk at Google

Friday, March 14, 2008

Jeff Hawkins: Brain science is about to fundamentally change computing

To date, there hasn't been an overarching theory of how the human brain really works, Jeff Hawkins argues in this compelling talk. That's because we still haven't defined intelligence accurately. But one thing's for sure, he says: The brain isn't like a powerful computer processor. It's more like a memory system that records everything we experience and helps us predict, intelligently, what will happen next. Bringing this new brain science to computer devices will enable powerful new applications -- and it will happen sooner than you think.

Brain, Mind, Consciousness and Learning