Researchers use lasers to induce gamma brain waves in mice

Deborah Halber, Picower Institute April 26, 2009

Scientists have studied high-frequency brain waves, known as gamma oscillations, for more than 50 years, believing them crucial to consciousness, attention, learning and memory. Now, for the first time, MIT researchers and colleagues have found a way to induce these waves by shining laser light directly onto the brains of mice.

Weiqing Ren
Courant Institute of Mathematical Sciences, New York University, New York, New York 10012

Weinan E
Department of Mathematics and PACM, Princeton University, Princeton, New Jersey 08540 and School of Mathematical Sciences, Peking University, Beijing, China

The physical processes near a moving contact line are investigated systematically using molecular dynamics and continuum mechanics. Constitutive relations for the friction force in the contact line region, the fluid-fluid interfacial force, and the stresses in the fluid-solid interfacial region are studied. Verification of force balance demonstrates the importance of the normal stress jump across the contact line region.

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