The ABCD study consists of two complementary parts, community phases and laboratories.

Community phases are carried out during the last term of the corresponding academic year and families and tutors participate through schools. The first community phase was carried out during the 2022-2023 academic year.

The laboratories are carried out throughout the corresponding academic year and a small number of families participate, who attend the facilities of the Human Laboratory research group at the UAB. The first laboratory was carried out during the 2023-2024 academic year.

Below you will find all the information related to each academic year.

Academic year 2025-2026

Laboratory 4

This stage has already begun and will be underway throughout the academic year 2025-2026 at the Autonomous University of Barcelona. It is aimed at a subgroup of girls and boys who are in fourth grade and had participated in Phase 1.

Phase 4

This phase will be carried out in the last quarter of the 2025-2026 academic year to monitor the girls and boys who are in fourth grade.

Academic year 2024-2025

Laboratory 3

This stage was carried out during the 2024-2025 academic year at the Autonomous University of Barcelona and was aimed at a subgroup of girls and boys participating in Phase 1 and who attended third grade of primary school. Around 200 girls and boys have participated.

Phase 3


This phase was carried out during the last quarter of the 2024-2025 academic year to monitor the girls and boys who were in third grade and had participated in Phase 1 and 2. In addition, participation was opened to new families of third grade of primary interested in participating. Around 600 girls and boys from 52 schools have participated.

Academic year 2023-2024

Laboratory 2

This stage was carried out during the 2023-2024 academic year at the Autonomous University of Barcelona and was aimed at a subgroup of girls and boys participating in Phase 1 and who were taking second grade of primary school. Around 200 girls and boys have participated.

Phase 2

This phase was carried out during the last quarter of the 2023-2024 academic year to monitor the girls and boys who had participated in Phase 1 and who were taking second year of primary school. Around 600 girls and boys from 52 schools have participated.

Academic year 2022-2023

Phase 1

This phase began the 2022-2023 school year and was aimed at all students by taking first year of primary school in public and subsidized centers in the city of Sabadell. Around 800 girls and boys from 52 schools have participated.

Thank you very much families and schools for your trust and participation!