Signs & Symptoms

Routine screening of toddlers for autism in China could lead to much earlier diagnosis of the condition.

The motion perception difficulties seen in people with fragile X syndrome, a leading cause of autism, may stem from a faulty visual circuit.

In autism research, as in other fields, small sample sizes can lead to false findings. The size of the sample needed for statistical significance depends on the type of study.

Even undiagnosed siblings of children with autism tend to struggle with anxiety, depression and social difficulties.

Fragile X syndrome is a leading genetic cause of autism. People who have either condition often share certain traits, such as difficulties in social situations.

Traits linked to autism and attention deficit hyperactivity disorder tend to co-occur even in adulthood.

People who have a mutation linked to autism plus a second genetic glitch tend to have more severe symptoms than those with the mutation alone.