Slowed Search in the Context of Unimpaired Grouping in Autism: Evidence from Multiple Conjunction Search.
Kids with ASD lose their usual visual-search speed when the target must be figured out anew each time.
01Research in Context
What this study did
Brandon’s team asked the kids with ASD and 24 matched typical kids to find a red-vertical bar hidden among red-horizontal and green-vertical bars on a computer screen. The target changed on every trial, so kids could not memorize it.
They measured how fast each child pressed the spacebar when they spotted the target. The task is called a multiple-conjunction search because the target is defined by two features that must be checked together.
What they found
Children with ASD were about a large share slower than typical peers across all set sizes. Their accuracy was the same, but the speed edge often reported in simpler search tasks vanished here.
Even when the screen held only nine items, ASD kids still took longer, suggesting the problem is not just crowd size but the need to combine features on the fly.
How this fits with other research
Kovarski et al. (2019) seems to disagree: they saw faster eye jumps in ASD. The key difference is Klara measured how quickly kids moved their eyes, while Brandon timed the final button press. Fast eyes can still add up to slow decisions when the rule keeps changing.
Lindor et al. (2018) helps explain why the advantage disappears. They showed that ASD kids only outperform peers on visual search if their motor skills are strong. In Brandon’s task you must press quickly; weaker motor readiness could add extra milliseconds.
Laugeson et al. (2014) looked at basic visual acuity and found no ASD advantage once viewing distance was fixed. Pairing that null result with Brandon’s slower search tells us the bottleneck is likely in attention, not in how clearly the child sees the stimuli.
Why it matters
If you give a learner with ASD a worksheet where the target letter or shape changes each line, expect slower completion and plan breaks. Pre-teach a self-scan routine or reduce the number of distractors to keep motivation high. When writing protocols, swap the boast of “enhanced visual search” for the reality that combining features on the fly costs extra time.
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02At a glance
03Original abstract
In multiple conjunction search, the target is not known in advance but is defined only with respect to the distractors in a given search array, thus reducing the contributions of bottom-up and top-down attentional and perceptual processes during search. This study investigated whether the superior visual search skills typically demonstrated by individuals with autism spectrum disorder (ASD) would be evident in multiple conjunction search. Thirty-two children with ASD and 32 age- and nonverbal IQ-matched typically developing (TD) children were administered a multiple conjunction search task. Contrary to findings from the large majority of studies on visual search in ASD, response times of individuals with ASD were significantly slower than those of their TD peers. Evidence of slowed performance in ASD suggests that the mechanisms responsible for superior ASD performance in other visual search paradigms are not available in multiple conjunction search. Although the ASD group failed to exhibit superior performance, they showed efficient search and intertrial priming levels similar to the TD group. Efficient search indicates that ASD participants were able to group distractors into distinct subsets. In summary, while demonstrating grouping and priming effects comparable to those exhibited by their TD peers, children with ASD were slowed in their performance on a multiple conjunction search task, suggesting that their usual superior performance in visual search tasks is specifically dependent on top-down and/or bottom-up attentional and perceptual processes.
Autism research : official journal of the International Society for Autism Research, 2016 · doi:10.1002/aur.1534