I read in an eeg-textbook, years ago, that the reference-voltage for normal EEG's was 50-microvolts, but in a schizophrenic's psychotic-fugue/episode, it can be required to be 250-microvolts.

It may simply be that with much of the brain understimulated, the threshold-for-paralyzed-in-dysfunction isn't ever crossed.

Sorta like those drag-racing cars, whose engines explode if run for 1-single-second more than the race they're built-for..

Stay below the energization-threshold ( blind-since-birth ) & then no problem.

Energize everything, & then the over-energized-to-being-broken threshold gets crossed.

It may have nothing to do with the visual-cortex itself, iow.. only with overall-brain-energization, that's creating this difference..

Also, a researcher named Thompson ( whose papers have been disappeared from the internet, now ) did a periodic-brain-scans-of-children study, where he showed that child-onset-schiphrenia involves the loss of 20% of the upper-forebrain, in a particular region, & the scans mapped where brain was being lost, in different areas..

The 10%-total-brain-reduction that has been known-about since the 1920's isn't even loss it is specific-areas which get corroded-down.

Having an already-full-cup, then reducing-the-size-of-the-cup, may be why it's a problem, & having a not-full-cup, with brain-capacity that's being underused, may allow adapting to it without dysfunction.

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