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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.
The symptoms of autism may range from total lack of communication with others to difficulty in understanding others' feelings. Because of the range of symptoms, this condition is now called autism spectrum disorder (ASD). High-functioning autism (HFA) is at one end of the ASD spectrum.Signs and symptoms are less severe than with other forms of autism. In fact, a person with high-functioning autism usually has average or above-average intelligence.The differences from other forms of autism have led many psychiatrists to consider high-functioning autism as similar to or the same as Asperger's syndrome.hey typically have average or above-average intelligence. They may, though, show other behaviors and signs similar to what's seen with other types of autism. These include: 1  A delay in motor skills. 2  A lack of skill in interacting with others.