Authors
Boutheina Jemel; Daniel Mimeault; Dave Saint-Amour; Anthony Hosein; Laurent Mottron

VEP contrast sensitivity responses reveal reduced functional segregation of mid and high filters of visual channels in Autism

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Abstract/Introduction

Despite the vast amount of behavioral data showing a pronounced tendency in individuals with autism spectrum disorder (ASD) to process fine visual details, much less is known about the neurophysiological characteristics of spatial vision in ASD. Here, we address this issue by assessing the contrast sensitivity response properties of the early visual-evoked potentials (VEPs) to sine-wave gratings of low, medium and high spatial frequencies in adults with ASD and in an age- and IQ-matched control group. Our results show that while VEP contrast responses to low and high spatial frequency gratings did not differ between ASD and controls, early VEPs to mid spatial frequency gratings exhibited similar response characteristics as those to high spatial frequency gratings in ASD. Our findings show evidence for an altered functional segregation of early visual channels, especially those responsible for processing mid- and high-frequency spatial scales.


Conclusion/Results

In this paper, we address the question whether the early cortical visual processes of spatial channels tuned to low, mid, and high spatial frequency inputs in autism show some modified functional properties with respect to typical adults. VEPs recorded to sinusoidal contrast reversal gratings revealed similar response contrast functions for ASD and controls to low and high spatial frequency gratings. Moreover, contrary to the controls' results, VEP contrast sensitivity to mid spatial frequency gratings in ASD was not different from that obtained for high spatial frequency gratings. Our present findings provide evidence for an altered functional segregation of early visual channels, especially those responsible for processing mid-frequency spatial scale. It is thus possible that their tendency to process visual details stems from the fact that a wide range of visual stimuli that fall within the mid-frequency range may be processed using the same mechanisms as those devoted to process high spatial frequency information.


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Testimonials


My eight year old daughter was terrified to go to the eye doctor for fear of her eyes being dilated. The doctor was SO KID friendly! He immediately made her comfortable by engaging her in conversation. It was a geat experience.


Joya B.

Dr. Garbus spent an amazing amount of time to solve my very complicated visual problems. Over the years he has continually achieved results beyond what others felt possible. He is always up to date on the latest science. He is great!


Dolores K.

Family Vision Care Valencia makes it so easy. Staff is knows what they are doing and Dr. Garbus is thorough and kept me well informed during the exam.


Kristy B.

I have been coming to Family Vision Center for almost 20 years. Dr. Garbus has been able to help my vision when other doctors could not. Now my kids see him as well. I highly recommend this office!


Autumn C.

The Doctor is very good. I felt on this visit he seemed rushed. I had questions to ask him but he was already with another patient. I still do not know if my eyes are the same , worse, or better.


Howard B.

All the staff is friendly, helpful and knowledgeable, and has been for all the years I have been going there.


Mary Ann H.
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