Neural Suitcase Tells the Tales of Many Minds

By Purnendu Ghosh

The book is about the mind. The most interesting interdisciplinary conversations and the best idea sessions are held inside our mind. The mind is our neural suitcase. Our neural suitcase tells the tales of so many minds. The tales are beautiful, moral, vulnerable, quiet, chaotic, hungry, obese, real, fictional, memorable, forgetful, creative, curious, humorous, trustworthy, biased, wise, foolish, friendly, hateful, meaningful, blind, and questioning. The mind also builds castles in the air. It is for us to put foundations under these castles. It is for us to pack our neural suitcase carefully.

Our questioning mind asks many interesting questions, such as: Should we design a perfect mind? Why does time have no mind of its own? Why is it hard to walk straight? Why do we make deliberate mistakes? Why is boredom not for everyone? What is the right dose of grief? Why is poison not always poisonous? Should we always hate our enemy? Why are memoirs fabricated? Why we are not totally dishonest? Why are all worries not worth worrying? Why shall some questions remain unresolved forever? The book is about the mind of a teacher, a mother, a beautiful woman, a gossiper, a liar, a fool, a corrupt person, a winner, etc.

• Language: English
• Publisher: Partridge Publishing India
• Release date: Jul 11, 2014
• ISBN: 9781482834895

Book preview

-1-

NEURAL SUITCASE

The most interesting interdisciplinary conversations happen inside your mind. Inside your mind, the best ideas are generated. It is your mind where the greatest Adda sessions are held. Mind can’t survive without Adda. Adda is talking about anything and everything under the sun at any time of the day. Mind works 24x7, and so our Adda sessions. Adda keeps the mind vibrant as during Adda sessions both idle gossip and cerebral culture are practiced.

Mind, our neural suitcase, determines the size of our world. Our neural suitcase needs repair and maintenance. It appreciates and depreciates. We might lose it if we don’t use it. There is nothing like empty mind. So much goes on inside the mind even when it is supposedly ‘empty’.

How you conduct your talks with yourself is thus important. Even when you are talking with someone else, you are, in fact, talking to yourself. Mental conversations go on uninterrupted when you are working, studying, reading, watching, walking and eating. You are constantly judging people even when you don’t know who that person is and how your judgment matters to you or that person.

My mind wanders. When I told one of my friends that my mind wanders he advised me to let it wander. He said that a wandering mind values others’ experiences and allows things to remain as they are. The mind wanders simply because consciousness changes its reference points every moment. It is natural for a wandering mind to experience spontaneous, unfocused, and unconstrained thoughts. Who knows when in those ‘unfocussed and unconstrained’ moments one may find a gem of a thought?

Science says that in mundane moments of life, our brain shifts to a default mode. This default mode has a role in generating spontaneous internal thoughts. Researchers say that the mind’s default network becomes more active during daydreaming. Building castles in the air is thus not a waste of time. If you have built castles in the air, your work need not be lost; that is where they should be. Now put the foundations under these, advises Henry David Thoreau. There are also many people who are great supporters of focused minds. They say a focused mind is vital for meditation. But my mind wanders during meditation; more so when I think of keeping it focused.

Some people believe that focus has distraction built into it. I would like to believe that imposed restrictions of any kind are not good for meditation. I want to believe that a wandering mind helps me to discover new ways of seeing the reality. Distraction of some kind, perhaps, helps us in finding new ways as we love variety, surprise and adventure of the unknown.

Like mind wandering, daydreaming seems to be a good idea, because it brings in more resources for the mind to work on. T E Lawrence said that people who dream with eyes wide open make their dreams come true for everyone. I also liked the observation of actor Sam Anderson, who said, The truly wise mind will harness, rather than abandon, the power of distraction. Unwavering focus—the inability to be distracted—can actually be problematic. It suggests that restlessness, in fact, can be advantageous. The message of the wise is that the inability to be distracted can actually be problematic. In other words, restlessness is advantageous. The daydreamers are not necessarily wastrels. John Tierney (1) sees a lot of merit in daydreaming.

Our spiritual and religious traditions tell us that the quieter you become the more you can hear. We are advised to ‘watch the thought, feel the emotion, and observe the reaction’. This is exactly what psychologists Mathew Killingworth and Daniel Gilbert experimentally did. They studied people’s ongoing thoughts, feelings and actions using smart phones (2). They asked simple questions like ‘What are you doing right now?’, ‘Are you thinking about something other than what you’re currently doing?’ Their purpose was to understand cognitive and neural bases of mind wandering.

The studies of Killingworth and Gilbert tell us that our mental lives are pervaded, to a remarkable degree, by the ‘non-present’. We spend much of our time in the non-present. We spend nearly half of our waking hours on thinking about something other than what is happening in front of us. The conclusion Killingworth and Gilbert have drawn is that a wandering mind is an unhappy mind.

On the other hand, a group of researchers think that a wandering mind can protect you from immediate perils and keep you on course toward long-term goals. They say that a wandering mind keeps the individual’s larger agenda fresher in mind. A wandering mind is good for creative activities.

Psychologist Jonathan Schooler (3) rightfully reminds us that just daydreaming is not enough. Letting your mind drift off is the easy part. The hard part is maintaining enough awareness so that even when you start to daydream you can interrupt yourself and notice a creative thought. Schooler’s research shows that mind-wandering can lead people to creative solutions of problems, which could make one happier in the long term.

We all know that we must not pass too much of our time on idle deliberations. It is absolutely understandable that during flow (a feeling of spontaneous joy, while performing a task) one’s subjective experience of time is altered. It is also true that being happy makes one more creative. But it is also a fact that it is not easy to control mind wandering. At any given moment so much information about the external world enters our brain. How can we stop them from entering our consciousness?

Going to the Himalayas is one way of experiencing solitude, but it is too bothersome. Moreover, such solitude may not serve the desired purpose. Can one leave his mind elsewhere for the sake of avoiding storms? Keeping a quiet mind amidst storm is not easy, as is remaining an individual in a crowd. The ability to think about what isn’t happening is a significant cognitive achievement, but it comes at an emotional cost, say Killingworth and Gilbert.

The extent of mind wandering depends upon the activity we are engaged in at that point of time. Mind wandering is not bad if it wanders during boring tasks. If during a lecture, students are more interested in the opposite sex sitting nearby rather than the lecture, whose fault is it? John Tierney rightly said, it depends on the lecture. If the lecture is interesting, one would not want his brains to miss vital knowledge. Otherwise, the brain would naturally like to be engaged in the more important agenda of finding a mate.

Often we are engaged in useless and futile conversations with ourselves. We often want to send our mind on a brief vacation. Minds that are on short vacation often yield very useful results. You may send your mind on short vacation, but don’t let anyone eat your head.

‘Don’t eat my head’ is a very commonly used expression. Interestingly, the usage of the term – ‘eating the head’ - may very well have been inspired from real instances found in nature. We are talking about sea squirts. These little animals belong to the same group as humans. In this sense sea squirts can be called our ancestors. The sea squirt larvae resemble tadpole larva. It doesn’t evolve into fish or amphibian. Instead, this little animal swim to find a good place to rest. Once it finds a good solid surface, it attaches itself there. It wants to take a long rest, and thus remains there permanently.

This distant cousin of our perhaps was too ‘smart’. It said to itself, ‘What will I do with my head if I don’t have to move?’ This smart thought made our distant cousin to believe that there is nothing wrong if one eats its own head. In fact, it did so, and started eating its own head. As a result of eating its own head it didn’t grow; it remained larva. We have learnt an important lesson from our distant cousin.

Those of us who think that head is a useless organ need remedial measures. Another lesson we have learnt from sea squirt is that if we let someone eat our head, it means we have given the person enough indication that our head has become useless, and one can eat it. So preserve your head with all your might. Don’t let anyone eat it. And don’t ever forget that your mind is one of your most important assets. If you lose it, you are lost. Your signature is not in your hand but in your mind. Your hand will not work unless your brain allows it to.

Brain works and mind think. Brain is physical. Mind enables one to have awareness and intentionality towards his environment and to have consciousness. Mind does things that enable consciousness, perception, thinking, feeling, judgment, and memory. The brain-mind questions relate the association of the mind with the brain. The brain, the control centre of the central nervous system, is responsible for thought.

Since we can think, we can make sense of things around us. Because we can think, we can generate our own ideas and can also make sense of others’ ideas. We can take decisions. We can imagine. We can recognize the patterns and understand their significance. Since we have a mind we can make sense of the world in a meaningful way. Since we have a mind we have the ability of memory. It is because of this ability we can preserve, retain, and subsequently recall, knowledge, information or experience.

Imagination evokes novel situations. Imagination can project possible future. It also can ‘see’ things from many angles. It is the ‘mind’s eye’ that sees and generates images and ideas.

The brain-mind relationship has been understood from three perspectives. One perspective says that the mind exists independently of the brain. Another perspective holds that mental phenomena are identical to neuronal phenomena. However, another perspective holds that only mental phenomena exist. Philosopher and cognitive scientist Daniel Dennett argues that there is no such thing as ‘mind’. There is simply a collection of sensory inputs and outputs. These sensory inputs and outputs are processed through different kinds of ‘software’ running in parallel.

Whatever are the subtle differences between these concepts, my simple mind doesn’t want to get into it at this point of time. I only want to understand if we have mind we need to use it and stretch it. We need to understand, as Ralph Waldo Emerson understood, that little minds have little worries, big minds have no time for worries.

Big or small, we are prisoners of our own mind. Our world is the size of our mind. We only can free our mind. We only can change our mind.

Brain is a physical entity that is there to interpret our senses, initiate our body movements, and control our behavior. Brain has many parts. Each part has a special function. All the parts of the brain work together (4). The three basic units of the brain are the forebrain, the midbrain, and the hindbrain. The hindbrain controls the body’s vital functions such as respiration and heart rate. The hindbrain includes the upper part of the spinal cord, the brain stem, and a wrinkled ball of tissue called the cerebellum. The cerebellum coordinates movement and is involved in learned rote movements. The uppermost part of the brainstem is the midbrain, which controls some reflex actions and is part of the circuit involved in the control of eye movements and other voluntary movements. The forebrain is the largest and most highly-developed part of the human brain. It consists primarily of the cerebrum and the structures hidden beneath it. The cerebrum holds our memories, allows us to plan, enables us to imagine and think. It is the source of intellectual activities.

The cerebrum is divided into two halves. The two halves communicate with each other through nerve fibers. These two halves are functionally quite different from each other. For example, the left half possesses the ability to form words, while the right half controls many of our abstract reasoning skills. The right half of the cerebral hemisphere primarily controls the left side of the body, and the left side primarily controls the right side. It means when one side of the brain is damaged, the opposite side of the body is affected; a stroke in the right side of the brain can leave the left arm and leg paralysed.

Each cerebral hemisphere can be divided into sections, or lobes, each of which specializes in different functions. The two frontal lobes, which lie directly behind the forehead, do much of the work when you plan a schedule, imagine the future, or use reasoned arguments. In the rearmost portion of each frontal lobe is a motor area, which helps control voluntary movement. A nearby place on the left frontal lobe called Broca’s area allows thoughts to be transformed into words.

The two sections behind the frontal lobes, called the parietal lobes, are at work to enjoy the taste, aroma, and texture of the food. The forward parts of these lobes, just behind the motor areas, are the primary sensory areas that receive information about temperature, taste, touch, and movement from the rest of the body.

The occipital lobes, the two areas at the back of the brain are at work when you look at the words and pictures. These lobes process images from the eyes and link that information with images stored in memory. Damage to the occipital lobes can cause blindness.

Our sense of music is through the activities of the temporal lobes that lie in front of the visual areas and nest under the parietal and frontal lobes. At the top of each temporal lobe is an area responsible for receiving information from the ears. The underside of each temporal lobe plays a crucial role in forming and retrieving memories, including those associated with music. Other parts of this lobe seem to integrate memories and sensations of taste, sound, sight, and touch.

Most of the actual information processing in the brain takes place in the cerebral cortex, commonly known as the ‘gray matter’. The structures that lie between the spinal cord and the cerebral hemisphere determine our emotional state and also modify our perceptions and responses depending on that state, and allow us to initiate movements that we make without thinking about them.

A pearl sized part of our brain, hypothalamus, does many important things like waking us up in the morning, controlling our adrenaline flow during an exam or an interview. The thalamus that lies near the hypothalamus is a major information track that goes to and from the spinal cord and the cerebrum. The basal ganglia are clusters of nerve cells surrounding the thalamus. They are responsible for initiating and integrating movements.

Amygdala, an almond-shaped structure in the brain is an indicator of our social networking capability (5). Located deep within the temporal lobe of the brain, amygdala is involved in the processing of emotions such as fear, anger and pleasure. Amygdala is also responsible for determining what memories are stored and where the memories are stored in the brain. Neuroscience researchers have shown that nonhuman primate species with larger social groups tend to have greater amygdala volumes. Animal studies have also shown that damage to the amygdala impairs social functioning.

In one study, researchers wanted to know how the size and complexity of the social network correlate with the size of amygdala. The participants were asked questions like how many people they kept in regular contact with and how many groups those individuals belonged to. The researchers, on the basis of brain images, found that volunteers who had bigger and more complex social networks had larger amygdala volumes. This observation was found to be independent of the age of the volunteers or their perceived social support or life satisfaction. The results thus ruled out the possibility that happiness is the underlying causal factor that links the size of this brain structure in an individual to their number of friends.

Researchers have pointed that the job of amygdala is to signal to the rest of the brain when something that you’re faced with is uncertain. For example, if you don’t know who someone is, and you are trying to identify them, whether it is a friend or a foe, the amygdala is probably playing a role in helping you to perform all of those tasks. Researchers also pointed out that amygdala size was not related to the quality of the relationships or to whether or not people enjoyed socializing.

How the amygdala contributes to social network is still a mystery. It is not clear if a big amygdala is a cause or a consequence of having a large social network. It is not yet clear if certain people are born with larger amygdala and therefore, create bigger social networks, or does the amygdala grow as one gains more friends and foes. Probably, it is both.

The primary functional unit of the brain is a cell called the neuron. All sensations, movements, thoughts, memories, and feelings are the result of signals that pass through the neurons. Neurons consist of three parts. The cell body contains the nucleus, where most of the molecules that the neuron needs to survive and function are manufactured. Dendrites extend out from the cell body like the branches of a tree and receive messages from other nerve cells. Signals then pass from the dendrites through the cell body and may travel away from the cell body down an axon to another neuron, a muscle cell, or cells in some other organ. The neuron is usually surrounded by many support cells. Some types of cells wrap around the axon to form an insulating sheath. This sheath can include a fatty molecule called myelin, which provides insulation for the axon and helps nerve signals travel faster and farther. Axons may be very short, such as those that carry signals from one cell in the cortex to another cell less than a hair’s width away. Or axons may be very long, such as those that carry messages from the brain all the way down the spinal cord.

Scientists have learned a great deal about neurons by studying the synapse—the place where a signal passes from the neuron to another cell. When the signal reaches the end of the axon, it stimulates the release of tiny sacs. These sacs release chemicals known as neurotransmitters into the synapse. The neurotransmitters cross the synapse and attach to receptors on the neighbouring cell. These receptors can change the properties of the receiving cell. If the receiving cell is also a neuron, the signal can continue the transmission to the next cell.

Acetylcholine, a key neurotransmitters, makes cells more excitable; it causes glands to secrete hormones. GABA (gamma-aminobutyric acid), a neurotransmitter that tends to make cells less excitable; it is an important part of the visual system. Serotonin is a neurotransmitter that controls sleep, temperature regulation. Dopamine is an inhibitory neurotransmitter involved in mood and the control of complex movements.

To know how the brain works we need to know the map of the brain. The idea of the connectional map is to integrate anatomy, neuronal activity, and function. We need to draw the wiring diagram of the brain to understand how the brain functions. The wiring diagram of the human brain will also shed light on disorders that are presumed to originate from faulty wiring.

The human brain is an intricate network of 100 billion neurons and 100 million synapses. Obviously, the wiring diagram of the brain is not easy to draw. Scientists have been able to draw the invaluable wiring diagram of C. elegans, a microscopic worm containing a mere 302 neurons. It took them more than a decade to draw the diagram of this tiny worm. In spite of the difficulties envisaged, scientists are hopeful of completing the human brain’s wiring diagram. The technological advance in neuroscience is one of the reasons of their optimism.

The classical approach to understand the working of a neurological system requires identification and connectivity of neurons that are involved in defined behaviours. The individual neurons are then excited to understand their role in influencing behaviour.

As we move from sponges and anemones to primates and humans, the neurological complexity increases several folds. It is much more difficult to identify neurons and then perturb individual neurons in the human brain. It is also difficult to record neuronal activity with enough spatial and temporal resolution. To address the challenges of spatial and temporal resolution, the development of multi-channel microelectrode recording arrays allows researchers to accurately measure the activity of multiple neurons at a single time.

Brain imaging techniques reveal how specific mental tasks selectively activate particular brain regions. By observing the brain activity one can actually read the mind of the subject. One can tell if one is thinking about a face or a place.

The brain imaging technique started with ventriculography procedure (drilling holes into the patient’s skull and injecting air into the lateral ventricles of the brain to obtain accurate x-ray images). Less invasive and more precise methods were then developed. The techniques include electroencephalography (EEG, measuring electrical movement by connecting electrodes to the patient’s scalp to read brain activity), computerised axial tomography (CAT, a computer-aided x-ray technology), positron emission tomography (PET, injecting radioactive tracers into the bloodstream and then tracing them into the brain), magnetic resonance imaging (MRI, using magnetic fields and radio waves to create brain maps).

The ability to observe both the structures and specific functions is possible using functional magnetic resonance imaging (fMRI). The technique provides high resolution, noninvasive information of neural activity. It is a tool to understand which region of the brain is working, for how long, and for a particular task. The brain regions that work harder need more oxygen. fMRI measures blood oxygenation levels as it varies with the varying metabolic demands of active neurons. Changes in demand for oxygen by the neural tissues reflect their underlying activity.

Not only, the diagnosis of neurological disorders is possible with fMRI; it can also read the brain’s reaction to foreign stimuli, and this forms the basis of drug development to correct certain disorders. fMRI development has also expanded the boundaries of cognitive neuroscience to non-health-related knowledge about human motivation, reasoning, and social attitudes. fMRI can reveal hidden thoughts, such as lies, truths or deep desires, say behavioural neuroscience researchers.

Researchers say that there are areas in the brain which respond to indoor and outdoor scenes depicting the layout of space. These areas, however, do not respond at all to faces. There are also regions that respond strongly when subjects view photographs of faces but weakly to other images. fMRI can tell which particular part of the cortex is used when we see or think about faces, and what cortical region is used during the perception and imagery of places.

In one experiment, subjects were asked by the researcher to look at the photographs of places or faces. Then the same subjects were asked to make mental images (with their eyes closed) of the same faces and scenes (6). The brain scan data revealed, a striking similarity between regions activated during (mental) imagery and those activated during (visual) perception. Since it is difficult to stop or restrict imagining while seeing, the interpretation of the data seems a challenging exercise.

The human brain is not complete at the time of birth. Much of the brain weight increase is during the first three years after birth. Dynamic changes take place in the human brain throughout life, probably for adaptation to our environment.

The average newborn human brain weighs less than 400 g. A typical human adult brain weighs about 1400 g. After reaching an age of about 20 years, the brain weight starts to decline, slowly but steadily.

The conventional view was that we are born with a set number of neurons, and we are hardwired in a certain way. It was also the view that we lose connections and neurons as we age, and finally, the brain falls apart. But the new understanding about brain