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Published Apr 21, 2022

655: David Eagleman | How Our Brains Construct Reality

Neuroscientist David Eagleman delves into the intricacies of how our brains construct reality, discussing phenomena like alien hand syndrome, brain-driven identity formation, and the adaptability of our perceptions. He also explores groundbreaking sensory substitution technologies that could dramatically expand human perception and assist those with sensory impairments.
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  • Internal Models

    The brain constructs reality using internal models, relying heavily on past experiences and goals. explains that vision is largely an internal process, where the brain makes educated guesses about the external world, using sensory data to verify or adjust these models 1. This process is so ingrained that missing sensory data, like smell, goes unnoticed, as the brain fills in gaps without conscious awareness 2.

    Your brain's got this internal model that's running. And it's just with the little bit of data that comes in through the senses.

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    This internal model allows us to navigate the world seamlessly, highlighting the brain's remarkable ability to create a coherent reality from limited information.

       

    Unconscious Processes

    Unconscious processes play a crucial role in shaping our perceptions and actions. illustrates this with the example of driving, where lane changes are performed without conscious thought, demonstrating the brain's ability to handle complex tasks automatically 3. These subconscious mechanisms are akin to background programs on a computer, running essential functions without our awareness 4.

    There's so much that our brains take care of that we're not even aware of.

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    This hidden activity underscores the brain's efficiency, allowing us to focus on higher-level tasks while managing countless processes beneath the surface.

       

    Subjective Perception

    Individual experiences shape subjective realities, leading to diverse perceptions of the same environment. notes that each person's brain constructs a unique version of reality, influenced by personal goals and experiences 5. This concept is exemplified by the idea of the "umwelt," where different species perceive the world through their unique sensory capabilities 6.

    Everybody essentially is living on their own planet.

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    Understanding these subjective perceptions highlights the complexity of human experience and the brain's role in crafting individual realities.

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