Could We Treat Alzheimer's with Light and Sound? | Li-Huei Tsai | TED

TL;DR

In this talk, Li-Huei Tsai discusses the potential of gamma light and sound stimulation to treat Alzheimer's disease.

Transcript

Hello, everyone. It is a tremendous pleasure to be here to share with you my story. You’ve all heard of brainwaves. For a long time, neuroscientists didn't know what they meant. But we slowly come to understand their purpose. The brain generates waves with different paces or frequencies to transmit information and thoughts by coordinating the activ... Read More

Key Insights

• 🧠 Gamma waves play a crucial role in synchronizing brain activity for processing new information and learning and memory.
• 👵 Alzheimer's disease is linked to weaker gamma waves, which can contribute to the buildup of plaques and tangles in the brain.
• 💡 Showing mice lights and sound at a 40-hertz frequency can boost gamma waves and improve brain function and memory in Alzheimer's mice models.
• 💡 Deaths from Alzheimer's disease have increased dramatically, highlighting the need for effective treatments as the population ages.
• 🐭 Stimulation of gamma waves in mice models of Alzheimer's disease resulted in reduced protein build-ups, preserved synapses, and better performance on learning and memory tests.
• 🩺 Clinical studies have shown promising results in humans, with increased gamma wave activity, improved connectivity, and preservation of brain volume.
• 🌟 Gamma wave stimulation is a safe and non-invasive approach, making it accessible for potential widespread use and integration into daily environments.
• 💭 Further studies are needed to determine the full clinical efficacy of gamma wave stimulation, but it holds potential for delaying the onset of Alzheimer's disease.

Questions & Answers

Q: What are gamma waves and what is their purpose in brain activity?

Gamma waves are brainwaves that have a frequency of 40 hertz and are responsible for coordinating the activity of nerve cells in the brain. They are important for synchronizing brain activity, processing new information from the senses, and for learning and memory.

Q: How do weaker gamma waves contribute to Alzheimer's disease?

Weaker gamma waves than they should be have been shown to contribute to Alzheimer's disease. Both people with Alzheimer's and laboratory mice that model the disease have been found to have reduced power and synchrony in gamma waves at the frequency of 40 hertz.

Q: What approach did the researchers take to potentially treat Alzheimer's disease by changing brainwaves?

The researchers worked with colleagues at MIT and found that they could boost gamma waves by showing mice lights blinking at a frequency of 40 hertz or by placing 40-hertz buzzing sound. This stimulation increased the power and synchrony of gamma waves across the brain.

Q: What were the effects of gamma wave stimulation on mice that modeled Alzheimer's disease?

Mice exposed to gamma light and sound stimulation showed major reductions in protein build-ups, amyloid plaques, and tau tangles that are hallmarks of Alzheimer's progression. The stimulation also preserved more connections between nerve cells, reduced brain decay, and improved their performance on learning and memory tests.

Q: Have the effects of gamma wave stimulation been tested in humans?

Yes, gamma wave stimulation has been tested in humans. Clinical studies have shown that gamma light and sound stimulation entrained stronger gamma waves in people, increased connectivity and synchrony in their brains, preserved brain volume, and improved cognitive functioning. A private company, Cognito Therapeutics, has also observed benefits in human testing, including reduced brain atrophy and improved mental functioning.

Q: Is gamma wave stimulation a safe and accessible approach to potentially treat Alzheimer's disease?

Yes, the gamma wave stimulation approach appears to be safe and accessible. Participants in the study consistently used their devices and tolerated the stimulation well. Unlike drugs, this stimulation is non-invasive and has minimal side effects. The researchers are now working on launching a new study to determine if gamma-wave stimulation can effectively delay the incidence of Alzheimer's disease.

Summary & Key Takeaways

• Brainwaves, particularly gamma waves at a frequency of 40 hertz, are important for synchronizing brain activity and are disrupted in Alzheimer's disease.

• Stimulating gamma waves through light and sound therapy shows beneficial effects in mice engineered to model Alzheimer's disease, including reductions in protein build-ups and improved cognitive performance.

• Preliminary clinical studies in humans have shown promising results, including increased connectivity and preservation of brain volume, suggesting that gamma wave stimulation may be a safe and accessible approach for Alzheimer's treatment.