What's the Difference?

The two halves of the brain do specialise - but not in the way pop psychology claims. Here's what the left and right hemispheres actually do, and why nobody is 'left-brained' or 'right-brained'.

The hippocampus and amygdala sit next to each other deep in the temporal lobe. One records what happened; the other flags whether it mattered. Here's how they differ - and how they work together.

Dementia is a general term for a decline in thinking skills; Alzheimer's is the most common disease that causes it. Learn how the main types of dementia differ and which brain regions each affects.

Parkinson's and Huntington's both damage the basal ganglia, yet one causes too little movement and the other too much. Here's how the same circuit can fail in opposite directions.

Grey matter is where neurons process information; white matter is the wiring that connects them. Learn what each is made of, where it's found, how it changes with age, and why both matter.