Abstract
People with autism show superior performance to controls on the Embedded Figures Test (EFT). However, studies examining the relationship between autistic-like traits and EFT performance in neurotypical individuals have yielded inconsistent findings. To examine the inconsistency, a meta-analysis was conducted of studies that (a) compared high and low Autism-Spectrum Quotient (AQ) groups, and (b) treated AQ as a continuous variable. Outcomes are consistent with superior visual search forming part of the broader autism phenotype, but in existing literature, this is evident only when comparing extreme groups. Reanalysis of data from previous studies suggests findings are unlikely to be driven by a small number of high scorers. Monte Carlo simulations are used to illustrate the effect of methodological differences on results.
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Notes
A comprehensive discussion of all documented strengths and weaknesses on visual tasks in autism and the theories that have been put forward to explain this pattern of performance is beyond the scope of this paper. Interested readers are referred to the following review paper for a review: Simmons et al. (2009).
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Acknowledgments
We would like to thank Renita A. Almeida, J. Edwin Dickinson, Johanna C. Badcock and David R. Badcock for allowing us to reanalyse data from work they completed with author M.T.M.
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This research was partially supported by an Australian Research Council Discovery Project Grant to M. Maybery and A. Whitehouse (DP120104713).
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M.T.M. conceived of the study and M.T.M., S.J.C., M.O. and R.D.L. participated in its design and coordination. R.D.L. and M.O. conducted the literature search and R.D.L., M.O. and S.J.C. reviewed articles for inclusion in the meta-analysis. M.O. conducted the meta-analysis. S.J.C. conducted the reanalysis of data from previous studies. P.D.D. provided expertise regarding extreme groups studies and Monte Carlo analysis, and wrote the software to conduct the Monte Carlo simulations. M.T.M. ran the Monte Carlo simulations using this software. S.J.C., M.O. and M.T.M. were involved in interpretation of the data. S.J.C. and M.O. are joint first authors and wrote the manuscript. S.J.C. substantially wrote the introduction, discussion and results of the reanalysis of previous data and Monte Carlo simulations, while M.O. substantially wrote the methods and results of the meta-analysis, though both authors contributed to all sections of the manuscript. M.T.M. reviewed numerous drafts of the manuscript and gave feedback on these drafts. All authors read and approved the final manuscript.
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Serena J. Cribb and Michelle Olaithe have contributed equally to this work.
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Cribb, S.J., Olaithe, M., Di Lorenzo, R. et al. Embedded Figures Test Performance in the Broader Autism Phenotype: A Meta-analysis. J Autism Dev Disord 46, 2924–2939 (2016). https://doi.org/10.1007/s10803-016-2832-3
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DOI: https://doi.org/10.1007/s10803-016-2832-3