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Study Reveals Delta Waves in Disconnected Brain Hemisphere

10/21/2025

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Summary

Story summary

A study published in PLoS Biology reports that after hemispherotomy, the disconnected hemisphere shows slow, sleep-like delta waves even when awake.
Researchers analyzed EEGs from ten children before and after surgery, noting persistent delta activity in the isolated region.
Co-author Marcello Massimini says the findings could broaden understanding of consciousness and brain function, with implications after stroke or traumatic brain injury.

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Story summary

A study published in PLoS Biology reports that after hemispherotomy, the disconnected hemisphere shows slow, sleep-like delta waves even when awake.
Researchers analyzed EEGs from ten children before and after surgery, noting persistent delta activity in the isolated region.
Co-author Marcello Massimini says the findings could broaden understanding of consciousness and brain function, with implications after stroke or traumatic brain injury.