Keyes structures Charlie's regression as a catastrophic system failure.

The intellectual collapse doesn't creep — it accelerates, and in the novel's final logs, Charlie's vocabulary, reasoning capacity, and memory don't degrade proportionally but vanish in discrete chunks, like a computer losing files to corruption.

This is mechanically clean and narratively devastating, yet also neurologically backward. The human brain doesn't work like a light switch with one filament — it works like a city with redundant infrastructure, with synaptic connections that layer and multiply across regions where the prefrontal cortex doesn't exist in isolation from the hippocampus, the anterior cingulate, the parietal networks.

Enhancement—if it were possible through a single intervention—would require rewiring distributed systems. Yet degradation of distributed systems happens unevenly, with some pathways persisting and some strengthening compensatively, which means the timeline Keyes chose—months, not years—contradicts how neural plasticity actually operates. The novel's design choice reveals its assumption: intelligence is a quantity, a scalar value, a thing you measure with a number and store in one location, and the symmetry is perfect but also impossible.

What matters isn't that Keyes got the neuroscience wrong—of course he did, in 1959—but that the shape of the wrongness shows us something about how mid-century science fiction conceptualized cognition, and we're still operating from that vending machine model of the brain in how we fund intelligence research, design educational interventions, and talk about cognitive decline in aging.