Hi everyone! 

This is my last research round of this cycle for my inquiry question: “what does it mean to be conscious?” I’ll be looking into head injuries to broaden the understanding of the connection between consciousness and unconsciousness. That is, I’ll be stating the causes, some examples, symptoms, treatments of head injuries. Moreover, I’ll be also discussing what happens after the loss of consciousness, why that happens and how does it affect the brain. In my previous research round, I mentioned how it is believed that consciousness is transitional since the brain varies in its current level and type of activity. I had used sleep as an example since whenever we fall asleep, we evidently aren’t capable of turning our consciousness on and off like a switch. Check my other most recent post for more information. @Bogdan Badea (Charles Best) pointed out that he believed that consciousness may not be a transition of states because whenever we receive a serious head injury, we lose awareness of everything around us. Thus, he argued that unconscious can, in reality, come to us in a quick blow. As a result, is it really transitional? It is arguable! Leave your opinions below on what you personally believe before reading this post. Let’s begin this round: 

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What is a head injury? What are its causes? 

-A head injury is whenever your brain, skull or scalp is harmed (1). It is defined as any traumatically induced structural injury or physiological disruption of brain function from an external force. About 40% of people with mild traumatic brain injuries (mTBI) don’t report their injuries which leaves many unchecked. Moreover, men are more likely to face traumatic brain injuries than women (2).

-The five abnormal states of consciousness that can result from a traumatic brain injury (TBI): stupor, coma, persistent vegetative state, locked-in syndrome, and brain death (3). 

-The chances are you've bumped your head before. Often, the injuries you get are minor due to your hard skull that protects your brain. However, there are other head injuries can be more severe, such as a skull fracture, concussion, or traumatic brain injury (4). They can be either open or closed. A closed head injury is any injury that doesn’t break your skull. An open head injury has the opposite meaning, and it is where there can be an object that pierced the skull. This results in it entering the brain (1, 4).  

-Common causes of head injuries are falls, motor vehicle accidents, violence, and sports injuries (4, 5). It’s typically caused from a blow in the head and can also occur from assaults. Such injuries can be traumatic and cause physical damage to the brain that includes bleeding, bruising, and torn tissues (5).  

The major types of head injuries we get

-->Hematoma: the clotting of blood outside the blood vessels. This leads to pressure building up inside your skull which result in loss of consciousness and permanent brain damage.  

-->Hemorrhage: uncontrolled bleeding in the space around you brain or inside its tissue. It often causes headaches and vomiting. 

-->Concussion: occurs when the impact of the head causes brain injury. It be believed to be the result of your head hitting something hard or forces of sudden acceleration and deceleration. The loss of function is temporary; however, if you get a lot of concussions, it can result in permanent damage. 

-->Edema: any brain injury may result in this. This is where you get swelling of surrounding tissues. It can lead in pressure buildup in your brain. 

-->Skull fracture: is any break in the cranial bone which normally occurs due to a big impact on the head. When this occurs, you are vulnerable due to the fact that a broken skull is unable to absorb the impact of a blow. Thus, you are more susceptible to get damage in your brain. 

-->Sheer injury: is when your brain cells get damaged, but there isn’t any bleeding. This can lead to permanent brain damage and death (1). 

**It is important to correct a misconception that head injuries, especially concussions, only occurs if an individual becomes unconscious. The reality is that injuries can occur without the loss of consciousness (also known as LOC). Athletes, in particular, are in danger of permanent and catastrophic neurologic harm if they don’t take the possibility or have the knowledge about getting head injuries (6). ** 

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What are the symptoms for a minor head injury? 

-It can be difficult to assess how serious a head injury is just by observing. Some minor head injuries bleed a lot whereas some major injuries don’t bleed at all. You always have to be careful. 



-->mild confusion  


-->temporary ringing in the ears (1) 

What are the symptoms of a major head injury? 

-->a loss of consciousness 



-->disorientation and a loss of muscle control 

-->abnormal eye movements 

-->a persistent or worsening headache (1, 4) 

-->memory loss (1) 

-->changes in mood 

-->leaking of clear fluid from the ear or the nose (1, 4) 

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What are treatments? 

-They vary in the type and severity of the injury. 

- For minor injuries, take Tylenol for the pain. Do not take Advil or aspirin (NSAIDs) since they make bleeding worse. For the long-term run, there aren’t lasting consequences. 

-Open cuts are dealt with sutures or staples to close it. 

-You may be hospitalized if you have other serious injuries. What happens to you for the short and long-term depend on your diagnosis. 

-->You may be given anti-seizure treatment and diuretics to help you excrete fluids for medication. 

-->You may be put under medication for induced coma. 

-->You may need to get a surgery to remove hematoma, repair and release pressure in your skull (1). 

See the source image(From my 1st round)

What happens to your brain when you lose consciousness, and why we lose consciousness? 

-In head injury, damage occurs because the person receives a blow to the head. This causes the brain to collide at high velocity with the bony skull in which it is housed. It bruises brain tissue and tears blood vessels. Thus, this makes the specific areas of the brain (ex. frontal and temporal lobes) to become damaged which can be detected through MRI and CAT scans. Moreover, the rapid movement that you get stretches and, thus, injures neuronal axons. What are neuronal axons? This is the tricky part. These are long threadlike arms of nerve cells in the brain that link cells to one another. They are responsible to link the brain to the rest of itself and the body. When they are injured, it interrupts functional communication within and between various brain regions and sometimes between the brain and other body parts. Remember from my first research round: when you are unconsciousness, your brain has isolated areas of activity. In other words, there is a communication breakdown. As you can see, the rapid decrease in communication may lead to unconsciousness.

However, let us address the transitional aspect of this. We know already that when a neuronal axon is damaged, there is a disruption in the functional communication within and between various brain regions (as well as other parts of the body). From the moment you get the impact, there is an increase of axons being stretched. As the amount of damaged axons increase, you drift into the unconscious side of the iceberg (view photo above the gif). Now, looking at the gif itself above, we can see that areas that are impacted the earliest are effected the first and, thus, receive stretches of the neuronal axons, bruises and tears in the brain first. Imagine a city. Pretend there was a power outage. The areas the closest to the power plant would lose their light first and so on. It's basically the same thing with the mind. As a result, it's a quick transition into the loss of consciousness (7). 

Image result for what is consciousness

What are the common problems your brain faces when facing a head injury? 

-Common Problems: 

-->Increased intracranial pressure 
When the brain is injured, it fills with fluid and swells. Because of the hard skull around it, however, the brain has nowhere to expand as it swells. This swelling increases the pressure inside the head and can cause further injury. 

-->Neurochemical problems that disrupt functioning 
Brains operate based on a “delicate chemistry”. Chemical substances in the brain called neuro-transmitters are necessary for communication between neurons (which are cells in the nervous system). When the brain is functioning normally, chemical signals are sent from neuron to neuron to perform functions. If such is disrupted, there is a chemical imbalance.  It can lead to problems in thinking, behaviors and the consciousness. 

-->Natural plasticity (ability of change) of the brain 
When the brain is injured, it is capable to set up new connections between neurons that carry the messages within our brains. It is known that the brain can create new neurons in some parts of the brain. Injuries to the head can affect the brain being capable to be active and adapt to problems that may arise (8).  

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(1) https://www.healthline.com/health/head-injury  

(2) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2923650/  

(3) https://www.brainline.org/arti...affect-consciousness  

(4) https://www.mayfieldclinic.com/PE-TBI.htm  

(5) https://healthprep.com/mental-health/different-ways-to-suffer-a-tbi/?msclkid=b5c4010b601f1fe412905ae4e3885257&utmsource=bing&utm_medium=search&utm_campaign=267709059&utm_content=1269936250735033&utm_term=head%20concussion  

(6) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC155414/  

(7) https://www.brainline.org/arti...diately-after-injury  

(8) https://www.brainline.org/arti...ecovery-brain-injury  


Please leave some possible suggestions I could take if I'll be taking this cycle further, or even comments on your personal take on my questionThank you for reading!



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Original Post

Hi Alison,

Great round of research! It was very detailed and informative, and I learned a few new things, such as the difference between an open head injury and a closed head injury. I think it's really good you're educating people about head injuries too, because head injuries aren't that uncommon, especially in sports. It's really important that people take care and try to protect their head from any injuries since injuries to the head can be quite damaging and possibly permanent. As you already know, I play soccer, and they always encourage us to use our heads. However, whenever we're practicing headers and I do several in a row, my head already starts to hurt a little, so I think it's important players are careful about it and don't overuse it.

As for your question about whether consciousness is transitional, it's hard to say. I think that maybe it simply depends on how you lose consciousness, because like Bogdan said, when we receive a major head injury, we can immediately lose all awareness of our surroundings. But then again, do we really know that the switch between consciousness and unconsciousness is instantaneous? Perhaps there is always at least a very short moment in between that we don't know about. Again, it's hard to say, and I think that this is something that would require more research and studies done on the topic.

In the meantime, here is an interesting journal that talks about the transitions between consciousness and unconsciousness:


Good luck!

Hellooo @Alison Wu (Charles Best)

Huh! A nice topic to go over especially those that apply. Injuries are serious and could be life changing. When you go over the different types, its fairly easy to understand and learned a few things for what happens if you get injured! As a badminton player, there isn't a higher risk to get our head injured when compared to other sports. However, anything could happen. 

On a side note, this sounds quite disturbing- as expected of what a problem is: 

When the brain is injured, it fills with fluid and swells. Because of the hard skull around it, however, the brain has nowhere to expand as it swells. This swelling increases the pressure inside the head and can cause further injury. 

The idea of transitions in 'states' also matters on the definition of what states are. One may find that sleeping is still being conscious while others do not. Would that entail being aware of surroundings? Or in control of our thoughts or processes in our brain? But then again, there are so many subconscious processes occurring already as well. Whether its transitional or not, the brain takes specific actions at certain times that benefits the best survival of the body and the functions. 

Since you mention this is your last research cycle, it was really cool to read about your research on consciousness! Our mind is one of the highest influences of what we do in daily life. 

Keep it up!


Hey Allison,

Your research was really nice to read! It was not only very educational but also very entertaining. I thought the incorporation of the gif was also very useful, too; I had a little bit of difficulty imagining how the brain would impact against one's skull, but the gif allowed me to visually see it.

I learned a lot from your post this week! For example, I did not know about neuronal axons and how a disruption in them can lead to a disruption in functional communication. Additionally, it was eye-opening to read a list of warning signs of minor and larger-scale head injuries. As someone who has never had even a minor concussion, this was all very new to me. 

If you do choose to go forward with this research, I think it would be cool to look at how humans can utilize their unconscious mind, examples of how people in the past have used it, and the potential within it (maybe as described by Freud?).

If you do choose to look into any of these topics, here are a couple of sites that could help you:

Good luck

Hey Alison, great round of research! I really like how you formatted it and used detail to make it easy to read.  I learned a lot, it was super interesting. The part I learned the most about is the part where you talked about why we lose consciousness when we suffer a blow to the head. I had always wondered why that is.  Perhaps in a future research round you could look into the process of the blood vessels and brain tissues being repaired.  Another thing I suggest you looking into is hypnosis since people are aware of what is happening but aren't processing it the same way. It would be interesting to read about the brain's consciousness during that. 

Overall, good job!

Hello Alison,

Slightly sad that this is your last round, but I did very much enjoy reading it. I would like to thank you for the explanation on the difference’s between the types of concussion’s and head injury’s, and open and closed, as it helped quite a bit in understanding what each thing meant, and how it is related to the topic, but my favourite part is how in-depth you went into the topics. I am curious though from all your researching into this and LOC, how fast does it happen? When you get a head injury and lose conscious, is it not instantaneous? I rest my case.

 It really is well done though, you do make me curious though are head injury’s different between different sports? For example, would a head injury sustained while skiing be different from one playing soccer? Or would they be generally the same? I’m interested to see what you come to conclude from your research though, I look forward to your next post.


Some websites that may help with your conclusion:

Hi Alison,
This is a very interesting subject.  For your question as whether consciousness is transitional or not, we obviously have no control over it.  When we fall asleep most consciousness is turned off, but there is still a small part of consciousness still there.  From what you have said, it seems that consciousness really isn't transitional.  Perhaps it varies in each situation.
From reading this, I have learned so much about brain injuries and how it can effect you. It really makes you realize how serious some brain injuries can be.  I did not realize there were so may different kinds.  The parts I found most interesting and intriguing were about the neuronal axons and how they are damaged as well as the natural plasticity of the brain.  I would love to hear more about that if you were considering doing more on this subject.  It is fascinating how the brain and even the body try to correct themselves.
Here is a website that may help give more ideas on the subject of consciousness.  It is a bit strange, but it is just there for some ideas:
I think you did a really great job on explaining this topic.  It was easy to follow and there was never a dull part.  Keep up the amazing work!
~Haley M.

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