Spatial Contrast Sensitivity in Adolescents with Autism Spectrum Disorders
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Adolescents with autism spectrum disorders (ASD) and typically developing (TD) controls underwent a rigorous psychophysical assessment that measured contrast sensitivity to seven spatial frequencies (0.5–20 cycles/degree). A contrast sensitivity function (CSF) was then fitted for each participant, from which four measures were obtained: visual acuity, peak spatial frequency, peak contrast sensitivity, and contrast sensitivity at a low spatial frequency. There were no group differences on any of the four CSF measures, indicating no differential spatial frequency processing in ASD. Although it has been suggested that detail-oriented visual perception in individuals with ASD may be a result of differential sensitivities to low versus high spatial frequencies, the current study finds no evidence to support this hypothesis.
KeywordsAutism spectrum disorders Spatial frequency Contrast sensitivity Visual acuity Perception Visual psychophysics
This research was supported by NIH grant R01 HD052804-01A2 (KD), and a WUN Research mobility award (HCK). We would like to thank all of the families who generously participated in this study, and the schools who helped with participant recruitment. We also acknowledge Ms Beth Hannaman, the Program Manager of Resources for Students with Autism, and the Research Review committee with the Research and Reporting Department, at the San Diego Unified School District for their valuable input and assistance in participant recruitment. We would also like to thank Sarah Song for her assistance with data collection, and Katie Wagner and Hao Ye for technical advice.
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