Why should I help?  

If your child is between the ages of 12-16, we are seeking their involvement in an important study that will help us to understand more about how young people spend their free time. This will help us to identify which activities affect young people’s health and wellbeing.  

Will my child’s answers to these questionnaires be kept private?  

All data will be kept confidential. No personal information (name or identification number) will be recorded in this research and no information about individuals will be given to the schools that participate. All data will be processed anonymously. The results of this study might be presented online or in a scientific journal, but the data is not traceable to an individual.

What does participation involve?  

Children will be asked to fill out an online questionnaire every evening for a week in which they will answer questions about how they spent their leisure time during that day. This will take around 15 minutes to complete. Before the children start, we will ask them once a series of questions about other aspects of their lives such as their friendships, mood, and bullying. This will take about 30 minutes to complete.  

Your child’s participation in this survey is voluntary. If you agree to them participating in this study, you or your child can indicate at any time that you wish to withdraw, without having to give an explanation.  

How can I help?  

If your child’s school has been invited to participate in the research, a letter with a consent form will have been given to you by your child’s teacher, or you can download it here from the website. Depending on the age of you child, we may also need your consent for your child to take part in this study. Please refer to the consent form for more information.    

What if I have more questions?

If you need more information about the study, you could send an email to this address: This email address is being protected from spambots. You need JavaScript enabled to view it..      


Project lead: Prof. Carolien Rieffe This email address is being protected from spambots. You need JavaScript enabled to view it.  

PhD position in autism project

January 4th, 2019


We are looking for a PhD student to join our project on creating an inclusive high-school environment for adolescents with autism. It is a fixed-term post for 5 years (0.8 fte). The PhD student has to be fluent in both Dutch and English. Click here to know more about the position and how to apply.


Ricardo Cachucho successfully defended his PhD research

December 10th, 2018

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On December 10th, Ricardo Cachucho (right photo, on the left) successfully defended his PhD thesis "Methods and tools for Mining Multivariate Time Series”, supervised by Joost Kok and Arno Knobbe at the Leiden Institute of Advanced Computer Science. Ricardo was the first to develop means for us to study children's movements on the playground, which has allowed us to measure the frequency and duration of children's interactions during play. We now widely apply this innovative method in all of our follow-up studies. During his PhD defense, Ricardo was able to expertly bridge the gap between Computer Science and Psychology. 

Parabens Dr. Cachucho!

Participate in our research!

November 10th, 2018

Adva is currently looking for participants for her research, which focuses on enhancing the social participation of deaf and hard-of-hearing children. Children in groep 7 or 8 in Dutch mainstream schools, who are deaf or hard-of-hearing, are invited to participate. You can read more about this research here and contact Adva (This email address is being protected from spambots. You need JavaScript enabled to view it.) or Carolien (This email address is being protected from spambots. You need JavaScript enabled to view it.) if you, your students or your children might be interested in participating.

We appreciate your support!

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Evelien Broekhof submitted her PhD thesis!

December 21st, 2018

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On Thursday December 20th, just before the start of the Christmas holiday, Evelien Broekhof submitted her thesis entitled "Reflect, (re)act and interaction; the roles of shame, guilt, and social access in adolescent aggression", supervised by Carolien and Marieke Bos. Great job, Evelien!


NOC*NSF Sport Gala 2018

December 20th, 2018

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On December 19th, the NOC*NSF held a sport gala for voting "the Atheletes of the Year", which was broadcast live on NPO 1. The NOC*NSF research program manager, Nicolette van Veldhoven (right on photo), is the principal investigator of the NWO "Kids First" project. This project, in which our lab participates, aims to create a safe social climate for children at sport clubs and started March 2018.


Boya gives her first lecture on moral emotions and culture

October 10th, 2018

Boya lecture

On Tuesday 25th of September, Boya gave her first lecture as part of the Clinical Child and Adolescent Psychology (CCAP) course for Bachelor students of Psychology.

Read more ...

Who are we?

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Our team is located at the department of Developmental Psychology of Leiden University in the Netherlands. We work in close collaboration with the Dutch Foundation for the Deaf and Hard of Hearing Child (NSDSK), the ENT department of the Leiden University Medical Centre (LUMC), and the Centre for Autism. Our group is dedicated to examining the emotional development of children and adolescents of all walks of life. We have a strong focus on the functionality of emotions, and its impact on children's social development. Besides typically developing children and adolescents, we are interested in the development of those with hearing impairments, with autism spectrum disorders, or with specific language impairments.

On this site we regularly post news items about new publications, events, and so on. You can also read more about our ongoing projects, read about and download questionnaires we have developed, see an overview of our publications per topic, or read about opportunities for students to join our team.