**2. Materials and Methods**

### *2.1. Design*

This observational, descriptive, and cross-sectional study was conducted from October 2019 to January 2020 in toddlers at the facilities of the University of Seville's (Spain) nursery schools. This study followed the Declaration of Helsinki's tenets. The parents were written and orally informed about the study characteristics, benefits, and risks. Written informed consent was obtained after explaining the nature and possible consequences of the study. The Institutional Review Board of the University Hospital Virgen Macarena of the University of Seville approved this research.

### *2.2. Subjects*

The sample consisted of 116 typical developing participants. Inclusion criteria were toddlers with normal or corrected-to-normal vision, and exclusion criteria were toddlers with previous history of disorder, toddlers with learning disabilities, and preterm toddlers.
