**5. Conclusions**

In summary, the pattern of results invites the conclusion that preschool children's ERPs associated with visual attentional selective-set were enhanced in response to target as compared to distractor, and may have involved functions and structures consistent with adult ERP activity. The modeling results sugges<sup>t</sup> a large-scale network, including Dorsal and Ventral Attentional Networks, corticostriatal loops, and subcortical hubs connected to prefrontal cortex top-down (working memory) executive control. The present findings are compatible with the claim [17] that the attentional selective-set might be, or become, adult-like by 4–5 years of age. Although preliminary, our approach may contribute to sugges<sup>t</sup> novel directions for further tests and falsifiable hypotheses on the origins and development of visual selective attention and their ERP correlates.

#### **Supplementary Materials:** The following are available online at http://www.mdpi.com/2076-3425/10/2/124/s1.

**Author Contributions:** A.D. is the primary author and contributor responsible for data collection, conceptualization, resources, supervision, funding, analyses, and final preparation and editing of the manuscript. D.A.T.P. was responsible for literature review, data analysis, methodological aspects and assembly and preparation of the first draft. G.G. was responsible for conceptualization, writing-review and editing and funding. G.L. was responsible for conceptualization, writing-review and editing of the revised final versions. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by a standard research gran<sup>t</sup> to A.D. and an insight gran<sup>t</sup> to G.G. from Social Sciences and Humanities Research Council of Canada.

**Acknowledgments:** We thank Patricia Van Roon for assistance with EEG/ERP analysis. We thank Nina Hedayati for curating parts of the project and preliminary writing for conference dissemination. We thank Christine Miller for assistance with data collection. We thank two anonymous pediatric neurology experts affiliated with the University of Ottawa Brain and Mind Research Institute who served as judges for the MRI mapping.

**Conflicts of Interest:** The authors declare no conflict of interest.
