Patients awaiting epilepsy surgery agreed to keep a running log of their mood while researchers used tiny wires to monitor electrical activity in their brains. The combination revealed a circuit for sadness.
Stuart Kinlough/Ikon Images/Getty Images
The fix was in for this rhesus macaque drinking juice on the Ganges River in Rishikesh, Uttarakhand, India. No gambling was required to get the reward.
Fotofeeling/Getty Images/Westend61 RM
Several circular herpes virus particles are seen near a cell membrane. Roseola herpes virus causes a childhood illness marked by skin rashes and now has been found in brains with Alzheimer's disease.
Marines based in Okinawa, Japan, fire an M136 AT-4 rocket launcher as part of a weapons training exercise on the Kaneohe Bay Range Training Facility, in 2014.
Lance Cpl. Matthew Bragg/U.S. Marines/DVIDS
Scientists placed two clusters of cultured forebrain cells side by side (each cluster the size of a head of a pin) in the lab. Within days, the minibrains had fused and particular neurons (in green) migrated from the left side to the right side, as groups of cells do in a real brain.
Courtesy of Pasca lab/Stanford University
This light micrograph of a part of a brain affected by Alzheimer's disease shows an accumulation of darkened plaques, which have molecules called amyloid-beta at their core. Once dismissed as all bad, amyloid-beta might actually be a useful part of the immune system, some scientists now suspect — until the brain starts making too much.
Martin M. Rotker/Science Source
Neuroscientist Joseph Jebelli says that while a certain amount of memory loss is a natural part of aging, what Alzheimer's patients experience is different.
Roy Scott/Ikon Images/Getty Images
Carl Luepker, his son Liam, 12, and daughter Lucia, 11, light the menorah during Hanukkah in their home in Minneapolis, Minn. Carl and Liam both have a degenerative nerve disorder called dystonia.
Jenn Ackerman for NPR
Alzheimer's disease causes atrophy of brain tissue. The discovery that lymph vessels near the brain's surface help remove waste suggests glitches in the lymph system might be involved in Alzheimer's and a variety of other brain diseases.
Alfred Pasieka/Science Source