Autistic people tend to have fewer GABA-ergic interneurons than non-autistic people, and autistic people with intellectual disability have the fewest. Autism Young children who attend more to the toys than to an ongoing social interaction in a video, as measured by eye tracking, are less likely to engage with their parents while playing with their own toys. Autism Research Glutamate AMPA receptors accumulate in the dendritic spines of motor cortex neurons of wildtype mice after the animals learn a motor skill, an upregulation that is absent in a mouse model of fragile X syndrome. eNeuro Rats exposed to particulate-matter air pollution show autism-like behaviors that seem to be accompanied by changes in SHANK3 expression and methylation. Heliyon Repetitive behaviors in children with behavioral, emotional or cognitive difficulties -not only in those with autism -are associated with heightened anxiety levels. Frontiers in Behavioral Neuroscience Autistic toddlers are less likely than those with other neurodevelopmental conditions to have gastrointestinal or sleep problems, though they still have high rates of both issues. Clinical Pediatrics Human neurodevelopment: Connections between the thalamus and the cortex are evident by 9 to 10 weeks after conception.