This image shows a mouse hippocampus.

Memories Get the Emotional Switch

A new study reports neurons which encode whether a memory is negative or positive can be reprogrammed to change the emotional association of the experience. Findings could have implications for future research into PTSD.
This image shows a top view of a mouse brain.

In a Battle of Brains, Bigger Isn’t Always Better

Bigger brains don't necessarily mean greater intelligence, at least in mice and rats, a new study reports. The findings could have major implications for the future of research into learning and behavior.