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Autism Spectrum Australia. Characteristics. Autism is characterised by marked difficulties in behaviour, social interaction, communication and sensory sensitivities. Some of these characteristics are common among people on the spectrum; others are typical of the disability but not necessarily exhibited by all people on the autism spectrum.
Brain development and autism spectrum disorder. In children with autism spectrum disorder (ASD), the brain develops differently from typically developing children: 1  The brain tends to grow too fast during early childhood, especially during the first three years of life.enetic factors seem to play a major part in autism spectrum disorder (ASD). For example, some families have multiple children diagnosed with ASD. Many of these families have higher rates of language and anxiety disorders.