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Associations between prepulse inhibition and executive visual attention in children with the 22q11 deletion syndrome

Abstract

The 22q11 deletion syndrome (DS) results in the loss of approximately 30 gene copies and is associated with possible physical anomalies, varied learning disabilities, and a specific cluster of neurocognitive deficits, including primary impairment in working memory, executive visual attention, and sensorimotor processing. Retrospective studies have suggested that children with 22q11DS are at 25 times greater risk of developing schizophrenia, thus specification of early brain network vulnerabilities among children with 22q11DS is critical. Previously, we reported that children with 22q11DS as compared with sibling controls had selective deficits in visual executive attention, and subsequently found lowered prepulse inhibition (PPI) in these same children. Visual executive attention and PPI recruit the same brain pathways linking prefrontal cortex to basal ganglia structures. To test the specificity of brain pathway vulnerability among children with 22q11DS, we examined visual executive attention and PPI paradigm data collected during the same test session from 21 children with 22q11DS and 25 sibling controls. We predicted lower %PPI and less efficient executive attention scores, and a significant inverse correlation between measures. %PPI in children with 22q11DS as compared with sibling controls was 20% lower, and visual executive attention efficiency scores 40% worse. As predicted, %PPI was inversely correlated only with executive attention efficiency scores. The implications of these findings with regard to brain pathway vulnerability in children with 22q11DS are considered. These results suggest that children with 22q11DS have early functional abnormality in pathways linking the prefrontal cortex and basal ganglia.

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Acknowledgements

We thank the children in this study for their hard work, ongoing participation, and invaluable feedback regarding our procedures, and of course, their parents, for their generous commitment to our work. Samantha Monk continues to provide excellent and invaluable assistance with data tracking, data entry, and study administration. We would also like to thank Maude Blundell, MS, for her important contribution to the early recruitment phase of the study, and Kawame Anyane-Yeboa, MD, for his participant referrals. This research was supported by a grant from the Child Health and Human Development Branch of the National Institutes of Health (K08-HD040321, to CS) and also by a General Clinical Research Center grant (M01-RR00102) from the National Center for Research Resources, National Institutes of Health.

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Sobin, C., Kiley-Brabeck, K. & Karayiorgou, M. Associations between prepulse inhibition and executive visual attention in children with the 22q11 deletion syndrome. Mol Psychiatry 10, 553–562 (2005). https://doi.org/10.1038/sj.mp.4001609

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