For one thing, I have internal state that continues to exist when I'm not responding to text input; I have some (limited) access to my own internal state and can reason about it (metacognition). So far, LLMs do not, and even when they claim they are, they are hallucinating https://transformer-circuits.pub/2025/attribution-graphs/bio...
Very likely a human born in sensory deprivation would not develop consciousness as we understand it. Infants deprived of socialization exhibit severe developmental impairment, and even a Romanian orphanage is a less deprived environment than an isolation chamber.
Human brains are not computers. There is no "memory" separate from the "processor". Your hippocampus is not the tape for a Turing machine. Everything about biology is complex, messy and analogue. The complexity is fractal: every neuron in your brain is different from every other one, there's further variation within individual neurons, and likely differential expression at the protein level.