Defining the Undefinable: What is Consciousness?
Dr. Sudheendra S.G. highlights consciousness as a
fundamental yet abstract concept, akin to energy in physics or life in biology,
which defies simple definition. He proposes defining it as "our awareness
of ourselves and our environment." This awareness is crucial for
integrating information from various sources and senses simultaneously.
Key Characteristics of Consciousness:
Fluid and Shifting: Dr. Sudheendra conceptualizes
consciousness as a "continuously moving, shifting, and unbroken
stream," often referred to as a "stream of consciousness." He
also likens it to "the brain’s roving flashlight, shining down an unbroken
beam of light that highlights one thing, and then moves on to the next."
This illustrates its dynamic nature, allowing for constant shifts in focus,
from immediate surroundings to abstract thoughts (e.g., "right now hopefully
you’re focused on the words coming out of my mouth, but with a little shift -
your mind might wander to how you really should shower today").
Facilitator of Higher-Order Cognition: Consciousness enables
us to "contemplate life, think about infinity, and ride a unicycle across
a tightrope while juggling melons, at least in theory." It plays a vital
role in planning futures, considering consequences, and reflecting on the past.
Familiar Yet Mysterious: Despite being an omnipresent part
of our experience, consciousness remains profoundly enigmatic, "kind of
like The Force -- but for the little universes inside our heads."
Varying States: Individuals cycle through different states
of consciousness daily, including waking, sleeping, and altered states. These
altered states can be "spontaneously" occurring (dreaming),
"physiologically sparked" (drug-induced hallucination), or
"triggered psychologically" (meditation or hypnosis).
2. Unveiling Consciousness: The Role of Cognitive
Neuroscience and Neuroimaging
Dr. Sudheendra emphasizes the revolution brought about by
modern technology in understanding the brain, moving beyond mere clinical
observation.
Cognitive Neuroscience: This field "is the study of how
brain activity is linked with our mental processes, including thinking,
perception, memory, and language."
Neuroimaging: Technologies such as structural imaging
(showing brain anatomy for identifying diseases) and functional imaging
(showing electromagnetic or metabolic activity like blood flow) have allowed
Dr. Sudheendra to "analysed and defined and studied links between specific
brain states and conscious experiences."
Limitations and Ongoing Research: While groundbreaking, Dr.
Sudheendra acknowledges that neuroimaging is a new field with ongoing
"disagreement about how to interpret neuroimaging findings." He
stresses the critical point that "correlation does not equal
causation," indicating that observed brain activity during certain
thoughts does not fully explain consciousness.
3. The Dual Layers of Consciousness
Dr. Sudheendra introduces the concept of "two
layers" of consciousness, supported by "dual process models."
This suggests that our conscious experience is not a singular stream but
involves parallel processing.
Conscious/Deliberate Mind: This is the overt, focused
awareness (e.g., "look! a squirrel!").
Implicit/Automatic Mind (Subprocessor): This operates
simultaneously and unconsciously, processing vast amounts of information in the
background, like a computer. An example given is the implicit processing of a
squirrel: "color: brown, tail: bushy, movement: climbing, distance: 20
meters, association: my sister had a squirrelphobia as a child, implicit bias:
I think that squirrels are ruining Consciousness and also my mind thinks about
Ramayana where squirrels helped rama build the ram sethu carrying stones . and
seeing the three line mark we immediately remember the mythological character
Rama."
Information Overload and Filtration: Our senses continuously
gather an astounding "11 million bits of information, EVERY SECOND,"
yet we consciously register "only about 40 at time." This highlights
the brain's incredible filtering capacity, largely handled by the implicit
mind.
4. Selective Attention: The Brain's Spotlight
To manage the vast influx of information, the brain employs
"selective attention," which Dr. Sudheendra describes as "how we
focus our consciousness on one particular stimulus or group of stimuli,
effectively tuning out the rest." He likens consciousness to "a
spotlight on a busy stage."
Examples of Selective Attention:
Sensory Filtering: The ability to ignore the sensation of
"socks on your feet" or "the tongue that’s inside your
mouth" until consciously directed to them.
The Cocktail Party Effect: "You could be in a room with
47 people jabbering away, and yet be able to concentrate your hearing on one
conversation, tuning out the rest of the voices and background music."
However, a personal stimulus like hearing "your name" can immediately
grab attention, demonstrating a "cognitive radar."
5. The Perils of Inattention: Inattentional Blindness and
Change Blindness
While selective attention is generally beneficial, it has
significant drawbacks, leading to our unawareness of much of our environment.
Inattentional Blindness: This occurs when "your full
attention is directed elsewhere," leading to a failure to notice
"obvious things." Dr. Sudheendra refers to classic experiments like
the "Invisible Gorilla" or "Moonwalking bear," where
approximately "50% of people didn’t notice that there was A GORILLA
WALKING THROUGH THE ROOM!" This demonstrates the powerful nature of
selective attention, where distractions fall away when focus is singular.
Change Blindness: This is "the psychological phenomenon
in which we fail to notice changes in our environment." An example is the
"person swap" experiment, where an experimenter is replaced by a
different person during an interaction, and "Half the time, the subject
doesn’t even notice."
Real-World Implications: Both inattentional and change
blindness have serious consequences, such as the dangers of "texting and
driving" leading to "selective inattention" and failing to see a
cyclist. They also contribute to "faulty memories lead[ing] to false
eyewitness testimonies in court, or when friends get deadlocked in a he-said,
she-said disagreement."
6. The Illusion of Awareness: Magicians and Misdirection
Magicians expertly exploit inattentional and change
blindness, terming it "misdirection." As modern magician P.C. Sorcar
states, "Every time you perform a magic trick you’re engaging in a
experimental psychology." This highlights our inherent susceptibility to
being "rubes" due to our limited conscious awareness.
7. Conclusion: The Vastness of the Unnoticed
Dr. Sudheendra concludes by emphasizing that "we are
far less aware of what’s going on around us than we think we are." This is
true even in a waking state, let alone "when you’re half-asleep, drunk,
hypnotized, or hallucinating!" The discussion sets the stage for future
explorations into subconscious activities like sleep and dreams.
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