Here is a roundup of news and research for the week of 20 January.

The bulk of the increase in autism prevalence stems from a growing awareness of the condition and changes to the diagnostic criteria.

A new map of the fetal brain during the second and third trimesters of pregnancy reveals the brain’s complex network of connections.

Researchers have monitored the active genome in brain organoids over the course of nearly two years — and may find clues to autism’s roots.

People with autism have more brain-related health problems, such as headaches and epilepsy, than typical people do.

The mutation that causes Angelman syndrome makes neurons hyperexcitable, which may explain the frequent seizures that most people with the syndrome have.

Here is a roundup of news and research for the week of 13 January.

Electronic neurons made from silicon mimic brain cells and could be used to treat conditions such as autism.

A child’s environment exerts a strong influence on the severity of her autism, a study of identical twins suggests.