| 1. |
- Albrecht, Matthew A., et al.
(författare)
-
Brief Report: Visual Acuity in Children with Autism Spectrum Disorders
- 2014
-
Ingår i: Journal of autism and developmental disorders. - : Springer Science and Business Media LLC. - 0162-3257 .- 1573-3432. ; 44:9, s. 2369-2374
-
Tidskriftsartikel (refereegranskat)abstract
- Recently, there has been heightened interest in suggestions of enhanced visual acuity in autism spectrum disorders (ASD) which was sparked by evidence that was later accepted to be methodologically flawed. However, a recent study that claimed children with ASD have enhanced visual acuity (Brosnan et al. in J Autism Dev Disord 42:2491–2497, 2012) repeated a critical methodological flaw by using an inappropriate viewing distance for a computerised acuity test, placing the findings in doubt. We examined visual acuity in 31 children with ASD and 33 controls using the 2 m 2000 Series Revised Early Treatment Diabetic Retinopathy Study chart placed at twice the conventional distance to better evaluate possible enhanced acuity. Children with ASD did not demonstrate superior acuity. The current findings strengthen the argument that reports of enhanced acuity in ASD are due to methodological flaws and challenges the reported association between visual acuity and systemising type behaviours.
|
|
| 2. |
- Albrecht, Matthew A., et al.
(författare)
-
Visual search strategies during facial recognition in children with ASD
- 2014
-
Ingår i: Research in Autism Spectrum Disorders. - : Elsevier BV. - 1750-9467 .- 1878-0237. ; 8:5, s. 559-569
-
Tidskriftsartikel (refereegranskat)abstract
- Facial recognition is a complex skill necessary for successful human interpersonal and social interactions. Given that the most prevalent disorder of social interaction is autism spectrum disorder (ASD), a number of studies have investigated and found impaired facial recognition abilities in people with ASD. Further, this impairment may be critically involved in mediating the deficits in interpersonal and social interactions in people with ASD. We sought to address the question of whether face processing is impaired in children with ASD in the current study. While there were a number of differences in visual search behaviours between the 19 children with ASD and the 15 controls, this did not manifest in deficits in facial recognition accuracy. In addition, there were notable differences with respect to eye fixation behaviours and recognition accuracy in this study compared to the findings in a previous similar study conducted in adults with ASD. These differences suggest a performance enhancing developmental trajectory in facial processing in controls that may not be present in individuals with ASD.
|
|
| 3. |
- Falkmer, Marita, et al.
(författare)
-
Local visual perception bias in children with high-functioning autism spectrum disorders: do we have the whole picture?
- 2016
-
Ingår i: Developmental Neurorehabilitation. - : Informa UK Limited. - 1751-8423 .- 1751-8431. ; 19:2, s. 117-122
-
Tidskriftsartikel (refereegranskat)abstract
- Objective: While local bias in visual processing in children with autism spectrum disorders (ASD) has been reported to result in difficulties in recognizing faces and facially expressed emotions, but superior ability in disembedding figures, associations between these abilities within a group of children with and without ASD have not been explored.Methods: Possible associations in performance on the Visual Perception Skills Figure–Ground test, a face recognition test and an emotion recognition test were investigated within 25 8–12-years-old children with high-functioning autism/Asperger syndrome, and in comparison to 33 typically developing children.Results: Analyses indicated a weak positive correlation between accuracy in Figure–Ground recognition and emotion recognition. No other correlation estimates were significant.Conclusion: These findings challenge both the enhanced perceptual function hypothesis and the weak central coherence hypothesis, and accentuate the importance of further scrutinizing the existance and nature of local visual bias in ASD.
|
|
| 4. |
- Horlin, Chiara, et al.
(författare)
-
The influence of static versus naturalistic stimuli on face processing in children with and without Asperger syndrome or high-functioning autism
- 2013
-
Ingår i: Research in Autism Spectrum Disorders. - : Elsevier. - 1750-9467 .- 1878-0237. ; 7:12, s. 1617-1624
-
Tidskriftsartikel (refereegranskat)abstract
- Questions regarding the use of static or dynamic facial stimuli in experimental studies investigating facial processing of individuals with AS/HFA raises issues of both ecological validity and the applicability of experimental findings to clinical or everyday practice. Children with and without AS/HFA (n = 38) were fitted with a head-mounted eye-tracker and exposed to either static or interactive dynamic facial stimuli. Average fixation duration, the proportion of fixations in areas of interest and a comparative index that was independent of differences in presentation length between stimuli types were calculated. Visual scanning patterns of individuals with AS/HFA were not affected by stimuli type. However, control participants exhibited different scanning patterns between dynamic and static stimuli for certain regions of the face. Visual scanning patterns in children with AS/HFA are consistent regardless of the stimuli being a static photo or dynamic in the form of a real face. Hence, information from experimental studies with static photos of faces provide information that is valid and can be generalised to "real world" interactions.
|
|
| 5. |
- Horlin, C., et al.
(författare)
-
Visual search strategies of children with and without autism spectrum disorders during an embedded figures task
- 2014
-
Ingår i: Research in Autism Spectrum Disorders. - : Elsevier. - 1750-9467 .- 1878-0237. ; 8:5, s. 463-471
-
Tidskriftsartikel (refereegranskat)abstract
- Individuals with ASD often demonstrate superior performance on embedded figures tasks (EFTs). We investigated visual scanning behaviour in children with ASD during an EFT in an attempt replicating a previous study examining differences in visual search behaviour. Twenty-three children with, and 31 children without an ASD were shown 16 items from the Figure-Ground subtest of the TVPS-3 while wearing an eye tracker. Children with ASD exhibited fewer fixations, and less time per fixation, on the target figure. Accuracy was similar between the two groups. There were no other noteworthy differences between children with and without ASD. Differences in visual scanning patterns in the presence of typical behavioural performance suggest that any purported differences in processing style may not be detrimental to cognitive performance and further refinement of the current methodology may lead to support for a purported advantageous cognitive style. © 2014 Elsevier Ltd.
|
|
| 6. |
- Joosten, Annette, et al.
(författare)
-
Gaze and visual search strategies of children with Asperger syndrome/high functioning autism viewing a magic trick
- 2016
-
Ingår i: Developmental Neurorehabilitation. - : Informa UK Limited. - 1751-8423 .- 1751-8431. ; 19:2, s. 95-102
-
Tidskriftsartikel (refereegranskat)abstract
- Objective: To examine visual search patterns and strategies used by children with and without Asperger syndrome/high functioning autism (AS/HFA) while watching a magic trick. Limited responsivity to gaze cues is hypothesised to contribute to social deficits in children with AS/HFA. Methods: Twenty-one children with AS/HFA and 31 matched peers viewed a video of a gaze-cued magic trick twice. Between the viewings, they were informed about how the trick was performed. Participants’ eye movements were recorded using a head-mounted eye-tracker.Results: Children with AS/HFA looked less frequently and had shorter fixation on the magician’s direct and averted gazes during both viewings and more frequently at not gaze-cued objects and on areas outside the magician’s face. After being informed of how the trick was conducted, both groups made fewer fixations on gaze-cued objects and direct gaze.Conclusions: Information may enhance effective visual strategies in children with and without AS/HFA.
|
|
| 7. |
- Leung, Denise, et al.
(författare)
-
Facial emotion recognition and visual search strategies of children with high functioning autism and Asperger syndrome
- 2013
-
Ingår i: Research in Autism Spectrum Disorders. - Elsevier : Elsevier. - 1750-9467 .- 1878-0237. ; 7:7, s. 833-844
-
Tidskriftsartikel (refereegranskat)abstract
- Adults with high functioning autism (HFA) and Asperger syndrome (AS) are often less able to identify facially expressed emotions than their matched controls. However, results regarding emotion recognition abilities in children with HFA/AS remain equivocal. Emotion recognition ability and visual search strategies of 26 children with HFA/AS and matched controls were compared. An eye tracker measured the number of fixations and fixation durations as participants were shown 12 pairs of slides, displaying photos of faces expressing anger, happiness or surprise. The first slide of each pair showed a face broken up into puzzle pieces. The eyes in half of the puzzle piece slides were bisected, while those in the remaining half were whole. Participants then identified which of three alternative faces was expressing the same emotion shown in the preceding puzzle piece slide. No differences between the participant groups were found for either emotion recognition ability or number of fixations. Both groups fixated more often on the eyes and performed better when the eyes were whole, suggesting that both children with HFA/AS and controls consider the eyes to be the most important source of information during emotion recognition. Fixation durations were longer in the group with HFA/AS, which indicates that while children with HFA/AS may be able to accurately recognise emotions, they find the task more demanding.
|
|
| 8. |
- Ordqvist, Anna, et al.
(författare)
-
Information and Repetition Change Children's Visual Strategies When Viewing Magic Tricks With and Without Gaze Cues
- 2013
-
Ingår i: Perceptual and Motor Skills. - : Ammons Scientific. - 0031-5125 .- 1558-688X. ; 116:1, s. 144-162
-
Tidskriftsartikel (refereegranskat)abstract
- Gaze cues and direct gaze attract visual attention. However, few studies have explored visual cues in children within realistic contexts. The effect of information and repetitive stimulus presentation has not been thoroughly studied with dynamic stimuli. The aim of the present study was to investigate how information affects the visual strategies of children measured by the number of fixations on certain areas of interest and their durations. Furthermore, this study examined the effect of gaze cues and direct gaze. In two consecutive experiments, children's visual strategies when viewing magic tricks were measured by an eye tracker. Gaze cues were only present in Experiment 1.The results showed that repetitive stimulus presentation and information caused children to change their visual strategies when viewing magic tricks with and without gaze cues. However, the effect was larger when the gaze cues were not present. These findings in children were similar to those in adults.
|
|
