There is a great diversity in the skills and behaviors of individuals diagnosed as autistic, and physicians will often arrive at different conclusions about the appropriate diagnosis. Much of this is due to the sensory system of an autistic which is quite different from the sensory system of other people, since certain stimulations can affect an autistic differently than a non-autistic, and the degree to which the sensory system is affected varies wildly from one autistic person to another.

Nevertheless, professionals within pediatric care and development often look for early indicators of autism in order to initiate treatment as early as possible. However, some people do not believe in treatment for autism, either because they do not believe autism is a disorder or because they believe treatment can do more harm than good

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Typically, developing infants are social beings—early in life they do such things as gaze at people, turn toward voices, grasp a finger, and even smile. In contrast, most autistic children prefer objects to faces and seem to have tremendous difficulty learning to engage in the give-and-take of everyday human interaction. Even in the first few months of life, many seem indifferent to other people because they avoid eye contact and do not interact with them as often as non-autistic children.

Children with autism often appear to prefer being alone to the company of others and may passively accept such things as hugs and cuddling without reciprocating, or resist attention altogether. Later, they seldom seek comfort from others or respond to parents' displays of anger or affection in a typical way. Research has suggested that although autistic children are attached to their parents, their expression of this attachment is unusual and difficult to interpret. Parents who looked forward to the joys of cuddling, teaching, and playing with their child may feel crushed by this lack of expected attachment behavior.

Children with autism appear to lack "theory of mind", the ability to see things from another person's perspective, a behavior cited as exclusive to human beings above the age of five and, possibly, other higher primates such as adult gorillas, chimpanzees and bonobos. Typical 5-year-olds can develop insights into other people's different knowledge, feelings, and intentions, interpretations based upon social cues (e.g., gestures, facial expressions). An individual with autism seems to lack these interpretation skills, an inability that leaves them unable to predict or understand other people's actions. The social alienation of autistic and Asperger's people is so intense from childhood that many of them have imaginary friends as companionship. However, having an imaginary friend is not necessarily a sign of autism and also occurs in non-autistic children.

Although not universal, it is common for autistic people to not regulate their behavior. This can take the form of crying or verbal outbursts that may seem out of proportion to the situation. Individuals with autism generally prefer consistent routines and environments; they may react negatively to changes in them. It is not uncommon for individuals to exhibit aggression, increased levels of self-stimulatory behavior, self-injury or extensive withdrawal in overwhelming situations.

A key indicator to clinicians making a proper assessment for autism would include looking for symptoms much like those found in sensory integration dysfunction. Children will exhibit problems coping with the normal sensory input. Indicators of this disorder include oversensitivity or under reactivity to touch, movement, sights, or sounds; physical clumsiness or carelessness; poor body awareness; a tendency to be easily distracted; impulsive physical or verbal behavior; an activity level that is unusually high or low; not unwinding or calming oneself; difficulty learning new movements; difficulty in making transitions from one situation to another; social and/or emotional problems; delays in speech, language or motor skills; specific learning difficulties/delays in academic achievement.

One common example is an individual with autism hearing. A person with Autism may have trouble hearing certain people while other people are louder than usual. Or the person with Autism may be unable to filter out sounds in certain situations, such as in a large crowd of people (see cocktail party effect). However, this is perhaps the part of the autism that tends to vary the most from person to person, so these examples may not apply to every autistic.

It should be noted that sensory difficulties, although reportedly common in autistic's, are not part of the DSM-IV diagnostic criteria for autistic disorder.

By age 3, typical children have passed predictable language learning milestones; one of the earliest is babbling. By the first birthday, a typical toddler says words, turns when he or she hears his or her name, points when he or she wants a toy, and when offered something distasteful, makes it clear that the answer is "no." Speech development in people with autism takes different paths. Some remain mute throughout their lives while being fully literate and able to communicate in other ways—images, sign language, and typing are far more natural to them. Some infants who later show signs of autism coo and babble during the first few months of life, but stop soon afterwards. Others may be delayed, developing language as late as the teenage years. Still, inability to speak does not mean that people with autism are unintelligent or unaware. Once given appropriate accommodations, many will happily converse for hours, and can often be found in online chat rooms, discussion boards or web sites and even using communication devices at autism-community social events such as Autreat.

Those who do speak often use language in unusual ways, retaining features of earlier stages of language development for long periods or throughout their lives. Some speak only single words, while others repeat the same phrase over and over. Some repeat what they hear, a condition called echolalia. Sing-song repetitions in particular are a calming, joyous activity that many autistic adults engage in. Many people with autism have a strong tonal sense, and can often understand spoken language. Some children may exhibit only slight delays in language, or even seem to have precocious language and unusually large vocabularies, but have great difficulty in sustaining typical conversations. The "give and take" of non-autistic conversation is hard for them, although they often carry on a monologue on a favorite subject, giving no one else an opportunity to comment. When given the chance to converse with other autistic's, they comfortably do so in "parallel monologue"—taking turns expressing views and information. Just as "neurotypicals" (people without autism) have trouble understanding autistic body languages, vocal tones, or phraseology, people with autism similarly have trouble with such things in people without autism. In particular, autistic language abilities tend to be highly literal; people without autism often inappropriately attribute hidden meaning to what people with autism say or expect the person with autism to sense such unstated meaning in their own words.

The body language of people with autism can be difficult for other people to understand. Facial expressions, movements, and gestures may be easily understood by some other people with autism, but do not match those used by other people. Also, their tone of voice has a much more subtle inflection in reflecting their feelings, and the auditory system of a person without autism often cannot sense the fluctuations. What seems to non-autistic people like a high-pitched, sing-song, or flat, robot-like voice is common in autistic children. Some autistic children with relatively good language skills speak like little adults, rather than communicating at their current age level, which is one of the things that can lead to problems.

Since non-autistic people are often unfamiliar with the autistic body language, and since autistic natural language may not tend towards speech, autistic people often struggle to let other people know what they need. As anybody might do in such a situation, they may scream in frustration or resort to grabbing what they want. While waiting for non-autistic people to learn to communicate with them, people with autism do whatever they can to get through to them. Communication difficulties may contribute to autistic people becoming socially anxious or depressed.

Although people with autism usually appear physically normal and have good muscle control, unusual repetitive motions, known as self-stimulation or "stimming," may set them apart. These behaviors might be extreme and highly apparent or more subtle. Some children and older individuals spend a lot of time repeatedly flapping their arms or wiggling their toes, others suddenly freeze in position. As children, they might spend hours lining up their cars and trains in a certain way, not using them for pretend play. If someone accidentally moves one of these toys, the child may be tremendously upset. Autistic children often need, and demand, absolute consistency in their environment. A slight change in any routine—in mealtimes, dressing, taking a bath, or going to school at a certain time and by the same route—can be extremely disturbing. People with autism sometimes have a persistent, intense preoccupation. For example, the child might be obsessed with learning all about vacuum cleaners, train schedules or lighthouses. Often they show great interest in different languages, numbers, symbols or science topics. Repetitive behaviors can also extend into the spoken word as well. Perseveration of a single word or phrase, even for a specific number of times can also become a part of the child's daily routine.

Children with autism are affected with these symptoms every day. These unusual characteristics set them apart from the everyday normal student. Because they have trouble understanding people’s thoughts and feelings, they have trouble understanding what their teacher may be telling them. They do not understand that facial expressions and vocal variations hold meanings and may misinterpret what emotion their instructor is displaying. This inability to fully decipher the world around them makes education stressful. Teachers need to be aware of a student's disorder so that they are able to help the student get the best out of the lessons being taught.

Some students learn better by visual aids. They are able to understand material that they see right in front of them. Because of this, many teachers create “visual schedules” for their autistic students. This allows the student to know what is going on through out the day. They know what to prepare for and what activity they will be doing next. Some autistic kids have trouble going from one activity to the next, so this visual schedule will cause less stress on such children.

Research has shown that working in partners is beneficial to autistic children. Autistic kids have problems in schools not only with language and communication, but with socialization as well. They feel self-conscious about themselves and feel that they will always be outcasts. By allowing them to work with peers, they could make friends that can help them go through the problems that they are dealing with. They wouldn’t feel like outsiders and could feel more involved in classroom activities.

A teacher's aide might also be useful to the student. The aide would be able to give more precise directions that the teacher doesn’t have time to explain to the autistic child. The aide would be able to give them breaks that are needed so they aren’t frustrated, while allowing them to stay caught up with what the rest of the class is doing. This would allow a more one on one lesson so that the child is still able to stay in a normal classroom, but be given the extra help that they need.

There are many different techniques that teachers can use to assist their students. A teacher needs to become familiar with the child’s disorder to know what will work best with that particular child. Every child is going to be different and teachers need to be able to adjust with every one of them.

Students with Autism Spectrum Disorders typically have high levels of anxiety and stress particularly in social environments like school. If a student exhibits aggressive or explosive behavior, it is important for educational teams to recognize the impact of stress and anxiety. Preparing students for new situations by writing Social Stories can lower anxiety. Teaching social and emotional concepts using systematic teaching approaches such as The Incredible 5-Point Scale or other Cognitive Behavioral strategies can increase a student's ability to control excessive behavioral reactions.