Summary
In northern fur seals the two brain hemispheres can generate the EEG slow waves during sleep not only simultaneously, as in all the terrestrial mammals investigated, but also independently as in dolphins.
References
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Mukhametov, L.M., Lyamin, O.I. & Polyakova, I.G. Interhemispheric asynchrony of the sleep EEG in northern fur seals. Experientia 41, 1034–1035 (1985). https://doi.org/10.1007/BF01952128
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DOI: https://doi.org/10.1007/BF01952128