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List of Possible Characteristics of a Person with Asperger's Syndrome (AS),High Functioning Autism (HFA) or Pervasive Developmental Disorder …

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Autism characteristics in adults - What are the specific symptoms of autism
Mottron L, Burack JA. Sensory, Motor and Attention Characteristics of Autistic Children. In: Tremblay RE, Boivin M, Peters RDeV, eds. Elsabbagh M, Clarke ME, topic eds. [online]. . Published July 2012. Accessed March 21, 2018.

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Parents’ understanding of atypical attention, perception and related behaviours, particularly in relation to the development of speech, should be addressed psycho-educationally. For example, aversive reactions due to auditory hypersensitivity, and positive emotions related to visual contemplations, may be a major element of daily interactions with an autistic toddler. In developing services and policy for early intervention, parents and professionals should consider that it might be more ethical and effective to present young children with autism information within a format that triggers their attention instead of forcing them to follow programs based on typical development and painful conditioning procedures.11

 

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The visual and auditory systems of autistics provide the rest of the brain with qualitatively and quantitatively different information than typical persons, yet that does not necessarily imply deficit.10 For example, attention is not biased to prioritizing social information, but socially-relevant material may still be processed effectively. Perception is more autonomous with regard to emotions, expectations and language-mediated processes. It is also more truthful and less distorted by top-down influences among autistics than among typical individuals. Although autism is characterized by a distributed, multilevel alteration of neuro-cognitive mechanisms, it is especially unique with regard to specifics of attention, perception processing and motor cognition.


One promising line of research is to bridge the well-established evidence of enhanced attention orientation toward perceptual regularities like auditory and visual patterns to initiatives in early intervention, in order to favour speech, literacy and improved understanding of the non-autistic world. At a fundamental level, we need to fill the gap between our understanding of behavioural and electrophysiological indices of attention and perception and the relation to cellular and genetic contributors. The role of the social and non-social aspects of the stimuli in perceptual skill and expertise needs to be better understood.


Autism behavior characteristics - Speech-Language …

Despite the early notions of a face processing deficit, the evidence is now more nuanced. Autistics show typical levels of performance on face perception tasks that involve facial images, although their scanning, sampling and later processing of faces are atypical.8 In the auditory modality, the enhanced processing of the physical aspect of speech may be associated with speech delay, a characteristic that is unique to autistics. All aspects of perception in autism appear to be less influenced by verbal, emotional, and generally by non-perceptual aspects of cognition. Rather, perception appears to play a prominent, if not always beneficial, role across a range of areas of functioning including language and problem-solving and reasoning.9 This is supported in the visual modality by compelling evidence from a functional imaging meta-analysis of all tasks of visual stimuli in which autistics were found to consistently display superior activity across brain regions involved in visual perception and expertise.

Autism Behavior Characteristics

Some perception-related behaviours among persons, such as atypical visual, random exploratory behaviours and lateral glance when exposed to periodic motion are relatively specific to autism. In addition, children with autism appear to fixate from an early age on audio-visual synchrony, as in the case of non-arbitrary coincidence between a visual and auditory event, and recurrent geometric patterns.5 Examples of superior visual and auditory low-level perceptual processing are common, including pattern detection, construction, manipulation, and the discrimination of luminance, pitch6 and symmetry. Although the integration of mechanisms appears intact under some experimental conditions, the typical spontaneous bias in favor of global aspect of information is diminished in autism. In contrast, the frequent suggestion that the perception of motion is impaired is not well supported by the scientific evidence.

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In the auditory modality, the diminished overt attention and body orientation to caregivers’ voices is an essential aspect of the autistic phenotype in toddlerhood. Whereas brain indices of attention toward speech-like stimuli are diminished, those involved in the detection of non-social auditory targets are fast and accurate.