: either of two prominences of the midbrain concerned with vision
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No area of the brain was spared from the shrinkage, but the change was especially pronounced in the optic lobes and the optic tract—the bundles of nerves that carry visual signals to the brain—with reductions of 52% and 62% respectively.—
Jeffrey Kluger,
Time,
9 July 2026 According to Science Alert, sleeping octopuses do this because neurons firing in their optic lobes cause their pigment-containing cells to become active.—Fox News,
28 Sep. 2019