"The hippocampus, a deep-brain structure that plays a role in memory and spatial navigation, continues to listen, learn and predict the meaning of words while a person is completely anesthetized."
"To test this hypothesis, the researchers recruited seven people who were scheduled for an anterior temporal lobectomy, a type of surgery in which pieces of brain tissue are removed in order to treat severe epilepsy."
"With the Neuropixels in place, the team played audio in the operating room. Some patients heard a sequence of repetitive tones that were interrupted by occasional unexpected frequencies, while others were treated to the Moth Radio Hour podcast."
Research indicates that the hippocampus remains active during general anesthesia, processing sounds and words without conscious awareness. A study involving patients undergoing surgery revealed that their hippocampal neurons could differentiate between expected and unexpected audio stimuli. This suggests that the brain continues to learn and predict meanings even when a person is fully anesthetized. The findings challenge previous assumptions about consciousness during anesthesia and highlight the brain's capacity for information processing in altered states.
Read at www.scientificamerican.com
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