The ability to recognize faces and interpret facial expressions is programmed partly by genes and inherited separately from other traits, according to three independent studies published this year.

Researchers have found a higher density of several types of interneurons — nerve cells that connect sensory and motor neurons in the brain— in postmortem brain tissue from individuals with autism, compared with healthy controls. The findings appear in the February issue of Acta Neurologica Scandinavica.

Several genetic and animal studies in the past year have found intriguing ties between autism and DISC1, one of the oldest candidate genes for psychiatric disorders.

When thinking about themselves, adults with autism have lower activity in two specific brain regions than do healthy controls, according to an imaging study published in the February issue of Brain.

Researchers are using dogs as models of psychiatric and behavioral conditions, including obsessive-compulsive disorder and autism.

A class of medications widely used during pregnancy to treat asthma and prevent early labor increases the baby’s risk of autism and other psychiatric disorders, according to a controversial review in the American Journal of Obstetrics and Gynecology.

Individuals who carry a large and rare deletion on chromosome 16 that is associated with autism are likely to have developmental delays, be obese or both, according to two studies published last week in Nature.

The TSC2 gene, mutations in which cause tuberous sclerosis complex, is needed for budding nerve fibers to find their proper targets in the brain, according to a mouse study published in Nature Neuroscience.

Genetic variations that tweak the brain’s release of oxytocin — a hormone involved in social bonding and establishing trust — may increase the risk of developing autism or traits of the disorder, according to three new studies published in the past few months.

A chilling new technique shows the intricate and coordinated activity of previously mysterious pieces of the synapse, the all-important junction between neurons that allows cells to talk to each other.