Ensemble perception in autism spectrum disorder: Member-identification versus mean-discrimination.
Kids with autism read the ‘big picture’ as well as peers but ignore visual clutter, so keep your teaching arrays consistent.
01Research in Context
What this study did
Luckasson et al. (2017) asked kids to look at groups of lines on a screen. Some kids had autism, some did not. The kids had to do two jobs: pick out one special line, or tell if the whole group was tilted left or right.
The test measured how well they saw the 'average' tilt of the whole group. The team also changed how different the lines were to see if that fooled the kids more.
What they found
Both groups got the average tilt right about the same. Kids with autism were not fooled when the lines became more varied. Typical kids did worse when the lines were very different from each other.
In short, the autism group saw the big picture just as well, but paid less attention to the little changes.
How this fits with other research
Maule et al. (2017) tested autistic adults with colored circles. Those adults had trouble averaging only when the set was tiny—four items. Ruth’s kids did fine with larger sets, so the trouble may appear only in adults or only with small sets.
Evers et al. (2014) used a moving-dot game and also found kids with autism were less bothered by visual clumps. Together these studies show the same pattern: people with autism notice the pieces but are less swayed by the overall grouping.
Keehn et al. (2016) looked at search speed and found kids with autism were slower when the target could not be defined ahead of time. That task needed flexible updating, while Ruth’s task only needed a quick average—explaining why no speed gap showed up here.
Why it matters
When you show arrays of pictures, letters, or data sheets, keep the layout steady. Kids with autism will grab the average just fine, but sudden size, color, or angle jumps will not cue them the same way they cue typical peers. Use that stability to your advantage during matching, sorting, or graph-reading lessons.
Want CEUs on This Topic?
The ABA Clubhouse has 60+ free CEUs — live every Wednesday. Ethics, supervision & clinical topics.
Join Free →Cut visual noise: use same-size, same-color stimuli in your array before you ask for a choice response.
02At a glance
03Original abstract
To efficiently represent the outside world our brain compresses sets of similar items into a summarized representation, a phenomenon known as ensemble perception. While most studies on ensemble perception investigate this perceptual mechanism in typically developing (TD) adults, more recently, researchers studying perceptual organization in individuals with autism spectrum disorder (ASD) have turned their attention toward ensemble perception. The current study is the first to investigate the use of ensemble perception for size in children with and without ASD (N = 42, 8-16 years). We administered a pair of tasks pioneered by Ariely [2001] evaluating both member-identification and mean-discrimination. In addition, we varied the distribution types of our sets to allow a more detailed evaluation of task performance. Results show that, overall, both groups performed similarly in the member-identification task, a test of "local perception," and similarly in the mean identification task, a test of "gist perception." However, in both tasks performance of the TD group was affected more strongly by the degree of stimulus variability in the set, than performance of the ASD group. These findings indicate that both TD children and children with ASD use ensemble statistics to represent a set of similar items, illustrating the fundamental nature of ensemble coding in visual perception. Differences in sensitivity to stimulus variability between both groups are discussed in relation to recent theories of information processing in ASD (e.g., increased sampling, decreased priors, increased precision). Autism Res 2017. © 2017 International Society for Autism Research, Wiley Periodicals, Inc. Autism Res 2017, 10: 1291-1299. © 2017 International Society for Autism Research, Wiley Periodicals, Inc.
Autism research : official journal of the International Society for Autism Research, 2017 · doi:10.1002/aur.1767