THIS IS INTERESTING: Zapping the brain’s visual cortex can lead to improved vision, scientists discover. “Researchers found that zapping the visual cortex of the brain for 20 minutes via transcranial direct-current stimulation offered improvements in vision lasting up to 2 hours.” I’ve heard of people experiencing tremendously clear vision — even when their ordinary vision was poor — under the influence of adrenaline surges. I wonder if these phenomena are related.