Flickering light increased a memory-related brain rhythm in the hippocampus

An exploratory study in eight people found more sharp-wave ripples during stimulation than during eyes-open rest, but did not test memory.

Editorial illustration — not from the study.

Researchers used ultra-high-frequency visual stimulation while recording brain activity from electrodes implanted in or near the hippocampus of eight people. They found more sharp-wave ripples—a brief, high-frequency brain rhythm linked to hippocampal activity—during stimulation than during eyes-open rest before and after it.

The exploratory study suggests that noninvasive visual stimulation can influence this memory-related rhythm while people are awake. Whether that change affects memory was not tested, so the findings point to a possible research route rather than a demonstrated memory treatment.

More ripples during stimulation

During periods of ultra-high-frequency visual stimulation, participants had significantly more hippocampal sharp-wave ripples per second than during an eyes-open resting-state baseline measured before and after stimulation. The researchers recorded these rhythms through electrodes implanted in or near the hippocampus. The study involved eight people.

Why the rhythm matters

Sharp-wave ripples are high-frequency activity patterns in the hippocampus that are associated with memory-related brain processes. The findings suggest that visual stimulation delivered without surgery could influence these rhythms during wakefulness, offering a possible way to study or eventually target them. However, this study did not show that the stimulation improves memory.

Evidence and limits

This was an exploratory, preliminary human study involving eight participants. Researchers recorded activity through electrodes implanted in or near the hippocampus and compared stimulation periods with an eyes-open resting baseline before and after stimulation. The study found more sharp-wave ripples during stimulation, but it did not test whether the stimulation improves memory. The small sample and exploratory design limit how broadly the findings can be applied.

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