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the claim
Split-brain patients can sleep like marine mammals
the verdict
REFUTED
the evidence says no
refutedsupported
the weight of evidence
0 sources for · 3 against

While split-brain patients exhibit altered interhemispheric communication during sleep due to callosal disconnection, they do not possess the ability to engage in unihemispheric sleep like marine mammals.

Evidence against · 3
Unihemispheric sleep and asymmetrical sleep: behavioral, neurophysiological, and functional perspectives
2016 · cited by 128
Unihemispheric sleep is a natural behavior found in certain marine mammals and birds, but not in humans or split-brain patients.
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The analysis

The claim asserts that split-brain (callosotomized) humans can sleep like marine mammals (i.e., unihemispherically, with one half of the brain awake and the other asleep). While marine mammals demonstrate this ability, human split-brain patients do not. Studies on split-brain patients confirm that while interhemispheric synchronization of sleep slow waves is impaired, they do not engage in unihemispheric sleep. Therefore, the claim is refuted.

More against · 2
Integrity of Corpus Callosum Is Essential for the Cross-Hemispheric Propagation of Sleep Slow Waves: A High-Density EEG Study in Split-Brain Patients
2020 · cited by 58
Split-brain patients show altered cross-hemispheric propagation of sleep slow waves due to lack of the corpus callosum, but they do not exhibit independent unihemispheric sleep like marine mammals.
Integrity of corpus callosum is essential for the cross-hemispheric propagation of sleep slow waves: a high-density EEG study in split-brain patients
2019 · cited by 6
Research on total callosotomy patients indicates that while corpus callosum integrity is essential for slow-wave propagation, the lack of the structure does not result in asymmetrical sleep depths characteristic of marine mammals.
The paper trail · every fact has a biography
first checked31 Jul 2026
judged → REFUTED · 1331 Jul 2026
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