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Van der Hallen, Ruth; Evers, Kris; de-Wit, Lee; Steyaert, Jean; Noens, Ilse; Wagemans, Johan – Journal of Autism and Developmental Disorders, 2018
The multiple object tracking (MOT) paradigm has proven its value in targeting a number of aspects of visual cognition. This study used MOT to investigate the effect of object-based grouping, both in children with and without autism spectrum disorder (ASD). A modified MOT task was administered to both groups, who had to track and distinguish four…
Descriptors: Autism, Pervasive Developmental Disorders, Children, Interference (Learning)
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Van Eylen, Lien; Boets, Bart; Steyaert, Jean; Wagemans, Johan; Noens, Ilse – Journal of Autism and Developmental Disorders, 2018
Local and global visual processing abilities and processing style were investigated in individuals with autism spectrum disorder (ASD) versus typically developing individuals, children versus adolescents and boys versus girls. Individuals with ASD displayed more attention to detail in daily life, while laboratory tasks showed slightly reduced…
Descriptors: Pervasive Developmental Disorders, Autism, Severity (of Disability), Symptoms (Individual Disorders)
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Van der Hallen, Ruth; Evers, Kris; Boets, Bart; Steyaert, Jean; Noens, Ilse; Wagemans, Johan – Journal of Autism and Developmental Disorders, 2016
Visual search has been used extensively to investigate differences in mid-level visual processing between individuals with ASD and TD individuals. The current study employed two visual search paradigms with Gaborized stimuli to assess the impact of task distractors (Experiment 1) and task instruction (Experiment 2) on local-global visual…
Descriptors: Autism, Pervasive Developmental Disorders, Comparative Analysis, Visual Perception
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Vanmarcke, Steven; Noens, Ilse; Steyaert, Jean; Wagemans, Johan – Autism: The International Journal of Research and Practice, 2018
Previous research suggested that adolescents with autism spectrum disorder are better than typically developing children in detecting local, non-social details within complex visual scenes. To better understand these differences, we used the image database by Sareen et al., containing the size and on-screen location information of all changes in…
Descriptors: Adolescents, Autism, Pervasive Developmental Disorders, Visual Perception
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Vanmarcke, Steven; Noens, Ilse; Steyaert, Jean; Wagemans, Johan – Journal of Autism and Developmental Disorders, 2017
While most typically developing (TD) participants have a coarse-to-fine processing style, people with autism spectrum disorder (ASD) seem to be less globally and more locally biased when processing visual information. The stimulus-specific spatial frequency content might be directly relevant to determine this temporal hierarchy of visual…
Descriptors: Autism, Pervasive Developmental Disorders, Visual Perception, Cognitive Processes
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Evers, Kris; Panis, Sven; Torfs, Katrien; Steyaert, Jean; Noens, Ilse; Wagemans, Johan – Journal of Autism and Developmental Disorders, 2014
Atypical visual processing in children with autism spectrum disorder (ASD) does not seem to reside in an isolated processing component, such as global or local processing. We therefore developed a paradigm that requires the interaction between different processes--an identification task with Gaborized object outlines--and applied this to two age…
Descriptors: Pervasive Developmental Disorders, Autism, Visual Perception, Children
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Vanmarcke, Steven; Mullin, Caitlin; Van der Hallen, Ruth; Evers, Kris; Noens, Ilse; Steyaert, Jean; Wagemans, Johan – Journal of Autism and Developmental Disorders, 2016
Typically developing (TD) adults are able to extract global information from natural images and to categorize them within a single glance. This study aimed at extending these findings to individuals with autism spectrum disorder (ASD) using a free description open-encoding paradigm. Participants were asked to freely describe what they saw when…
Descriptors: Young Adults, Visual Perception, Pervasive Developmental Disorders, Photography
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Evers, Kris; de-Wit, Lee; Van der Hallen, Ruth; Haesen, Birgitt; Steyaert, Jean; Noens, Ilse; Wagemans, Johan – Journal of Autism and Developmental Disorders, 2014
This study was inspired by the more locally oriented processing style in autism spectrum disorders (ASD). A modified multiple object tracking (MOT) task was administered to a group of children with and without ASD. Participants not only had to distinguish moving targets from distracters, but they also had to track targets when they were visually…
Descriptors: Cognitive Processes, Autism, Pervasive Developmental Disorders, Eye Movements
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Evers, Kris; Noens, Ilse; Steyaert, Jean; Wagemans, Johan – Research in Autism Spectrum Disorders, 2011
Background: Children with an autism spectrum disorder (ASD) are known to have an atypical visual perception, with deficits in automatic Gestalt formation and an enhanced processing of visual details. In addition, they are sometimes found to have difficulties in emotion processing. Methods: In three experiments, we investigated whether 7-to-11-year…
Descriptors: Autism, Pervasive Developmental Disorders, Visual Perception, Nonverbal Communication