- Sahar Samy
- Jul 4, 2023
- 3 min read

What is consciousness?
We all know what is like to be conscious:
To be aware of ourselves and the world around us. And we also know how to recognize different kinds of unconsciousness, as:
- When someone is asleep.
- When someone is under anapaestic.
Even so, scientists have struggled to explain what consciousness is in a scientific way and terms.
Early psychologists like William James and William Wundet believed that the purpose of psychology is to describe and explain the human conscious behaviour.
Being conscious is a personal experience, and the only way which they could examine consciousness was through observing what is going on their own minds.
Through this process of observing, William James noticed that his conscious thoughts were constantly changing when he was thinking or doing one thing, something else sprang to his mind.
As if thoughts have been interrupted by another thought… and so on.
James also noticed that the way which these different experiences seemed all to come together from one thought, and he called that “Stream of Consciousness”.
Sigmund Freud was also fascinated by consciousness, but he didn’t try to explain the state of being conscious, he identified three levels of consciousness:
The conscious mind includes everything that we are aware of. This is the aspect of our mental processing that we can think and talk about rationally. A part of this includes our memory, which is not always part of consciousness but can be retrieved easily at any time and brought into our awareness. Freud called this the preconscious.
The preconscious mind is the part of the mind that represents ordinary memory. While we are not consciously aware of this information at any given time, we can retrieve it and pull it into consciousness when needed.
The unconscious mind is a reservoir of feelings, thoughts, urges, and memories that outside of our conscious awareness. Most of the contents of the unconscious are unacceptable or unpleasant, such as feelings of pain, anxiety, or conflict. According to Freud, the unconscious continues to influence our behaviour and experience, even though we are unaware of these underlying influences.
Freud linked these three levels of mind to an iceberg. The top of the iceberg that you can see above the water represents the conscious mind. The part of the iceberg that is submerged below the water but is still visible is the preconscious. The bulk of the iceberg lies unseen beneath the waterline and represents the unconscious.
Modern neuroscience suggests that the difference between consciousness and unconsciousness is not clear till now, even while person in a coma, the brain is still active.
The biologist Francis Crick compared the brain activity of healthy people and those in a persistent coma state, he found that in the consciousness brain there was more activity in the cortex area than in the unconsciousness brain. So, the conclusion was that this part of the brain cortex is associated more with consciousness, and the consciousness is a result of the connections and association in various parts of our brains, by linking the information from all our senses, memories and thoughts.
Another neuroscientist explained this by using a camera taking a picture of an apple, the image the camera receives is composed of many different pixels, but the camera treats each pixel separately and doesn’t see the apple as a whole.
In contrast, our brains can make the connections between the pixels to give us a picture of the apple in our minds, and to remind us of everything we associate with the idea of an apple.
So, it is not just the amount of activity in our brains, but the degree of its interconnectivity, that determine our level of consciousness.