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Pieter Hoekstra

Telefoonnummer
06 12 24 38 57

Pieter Hoekstra is Professor of Child and Adolescent Psychiatry at the Accare Child Study Center and the University of Groningen.

Biography

Pieter’s research primarily relates to children with a developmental disorder (ADHD, autism spectrum disorder, Gilles de la Tourette syndrome). He focuses on both aetiology (genetics, gene-environment interactions, neuroimaging) and treatment. One of his specific interests is research into the outcomes of children and adolescents being treated with psychopharmaceutical drugs, especially predictors of response, side-effects and the long-term effects of psychopharmaceuticals. 

Pieter is also active in patient care. He works at the Groningen outpatient clinic, primarily seeing children with tics and/or ADHD.
 

Research studies

OLAV

Status
Searching participants

The OLAV research study is about ‘Education for pupils with autism: supporting teachers’.

Tic Genetics

Status
Analysis

The aim of this major international study is to discover the genes that cause Gilles de la Tourette syndrome and other tic disorders.

TRACE

Status
Searching participants

The TRACE treatment study is investigating how dietary treatment affects ADHD in the short term and the long term.

Aggressotype

Status
Analysis

The Aggressotype research study is a large-scale international study of the causes of various types of aggressive behaviour.

Parent training for ADHD

Status
Completed

This research study investigated whether group-based parent training can help reduce parental stress and the behavioural problems of the child or adolescent.

EMTICS

Status
Analysis

European Multicentre Tics in Children Study (EMTICS) is the first large-scale and long-term study of the role played by genes, inflammation processes and...

STAP-studie

Status
Completed

We compared the effects of two types of follow-up treatment: medication (methylphenidate) and behavioural therapy for both parents and child.

NeuroIMAGE

Status
Completed

We researched the effect of ADHD medication on the brain development of children with ADHD and also the effects that only become evident later, e.g. in young...

ATHENE

Status
Completed

This research study investigated the differences between the usual method of taking part in this training, i.e. at the outpatient clinic, and a ‘blended’...

MASK

Status
Completed

This research study examines the efficacy of methylphenidate following more than two years of use.

SPARTA

Status
Analysis

This research study examines the effectiveness of two types of parent training: training at the outpatient clinic and training via an online treatment...

Long-term use of risperidone

Status
Analysis

This research study examines the long-term efficacy of risperidone use for behavioural problems experienced by children, adolescents and adults with...

TRAILS

Status
Analysis

TRAILS is a large-scale, longitudinal Dutch research study of the mental, social and physical development of over 2,500 adolescents progressing towards...

TS-Eurotrain

Status
Completed

The aim of this study was to investigate the role ADHD in children with tic disorders.

Predictors of treatment success

Status
Analysis

In this research study we have studied what the role is of family, parent, child and environmental factors in treatment success in child- and adolescent...

MATRICS

Status
Completed

Project which investigates the (neuro)biological mechanisms, genetics and potential novel treatment possibilities regarding aggression, behavioral problems...

IBIS

Status
Analysis

Behavioral therapeutic techniques can help staff in dealing with people with challenging behavior. Previous research show that these techniques work, but...

NeuroIMAGE

Status
Analysis

NeuroIMAGE is an NWO-funded, Dutch follow-up study of the IMAGE project, which is a multi-site, international cohort study set up to investigate the genetics...

BIRD

Status
Analysis

In the BIRD project we will investigate early signs of developmental disorders. 1700 children representative of the Dutch population will be assessed to...

VANTASTIC

Status
Analysis

Do vitamins and minerals help to become less irritable?

Tackle your tics

Status
Analysis

Tackle your Tics is a brief, intensive group-based treatment for 9-17-year-old children with troublesome tics.

DREAMS

Status
New

DREAMS is a collaboration between the four large, academic institutions for child and adolescent psychiatry in the Netherlands: Accare, Curium , Karakter and...

SCODA

Status
Searching participants

Youth with behavioural problems (also referred to as disruptive behaviour) often experience difficulties in their interactions with other people. We think...

SCASS

Status
Searching participants

In this study we investigate how social information is processed in the brain of adolescents with and without ASD.

PAINT

Status
Analysis

PAINT is the overarching name for the studies conducted within a consortium funded by, among others, ZonMw and the training institute PPO.

Bounce Back

Status
New

Study on risk and resilience, differences in coping strategies, quality of life and stigma. We will study this in children and adolescents with Tourette...

ADHD@Home

Status
Completed

The aim of this study is to investigate the effectiveness of home treatment in children with ADHD.

PAINT-P Microtrial

Status
Completed

In the PAINT-P Microtrial, we investigated the effectiveness of two types of behavioral therapy techniques separately. Based on this research and a...

PAINT-T Microtrial

Status
Completed

In the PAINT-T Microtrial, we investigated the effectiveness of different behavioral techniques (antecedent and consequent techniques) that teachers learn in...

PAINT-M

Status
New

Parent training is effective in reducing ADHD and behavioral problems. But which elements of parent training are the most effective, and why? This is what we...

More research studies

Publications

Home-based parent training for school-aged children with attention-deficit/hyperactivity disorder and behavior problems with remaining impairing disruptive behaviors after routine treatment: a randomized controlled trial

Published on date

30 September 2021

Published in

European child & adolescent psychiatry

De behandeling van kinderen met ADHD bestaat meestal uit oudertraining en/of medicatie. Als dat onvoldoende helpt wordt vaak een thuisbehandeling gestart. Er komt dan een behandelaar bij het gezin thuis om samen met de ouder(s) en het kind te werken aan de problemen die ouders thuis met hun kind ervaren.We onderzochten de werkzaamheid van een nieuw ontwikkelde gedragstherapeutische...

Mental and Social Health of Children and Adolescents With Pre-existing Mental or Somatic Problems During the COVID-19 Pandemic Lockdown

Published on date

8 July 2021

Published in

Frontiers in Psychiatry

De landelijke Coronamaatregelen, en in het bijzonder de meer strenge ‘lockdowns’ in Nederland hebben geleid tot een toename aan psychische klachten onder kinderen en jongeren. Vanuit DREAMS hebben we het geestelijk en sociaal welzijn tijdens de eerste Corona lockdown in Nederland onderzocht bij jongeren met psychische klachten, die op dat moment in behandeling waren bij de zorginstellingen...

Clinical precursors of tics: an EMTICS study

Published on date

25 June 2021

Published in

Journal of Child Psychology and Psychiatry, and allied disciplines

Tics ontstaan meestal tussen de 3 en 6 jaar. Van andere aandoeningen zoals autisme of schizofrenie is bekend dat er al vroege tekenen zijn van ‘anders zijn’. Nog voordat de eerste duidelijke symptomen van de aandoening optreden. In dit onderzoek vroegen we ons af of kinderen die tics ontwikkelen al op vroege leeftijd ‘anders’ zijn. Dit is nog nooit eerder onderzocht bij tics. 

Impaired response inhibition during a stop-signal task in children with Tourette syndrome is related to ADHD symptoms: A functional magnetic resonance imaging study

Published on date

June 2021

Published in

The World Journal of Biological Psychiatry

Tics zijn plotseling en snel. Dit zou er wel eens toe kunnen leiden dat kinderen met tics minder goed gedrag kunnen afremmen. Dit is een belangrijke vaardigheid om ons gedrag te reguleren. Kinderen met ADHD hebben ook vaak moeite met het afremmen van gedrag en zijn impulsief. ADHD komt vaak voor bij kinderen met tics. We hebben daarom onderzocht of het afremmen van gedrag te maken heeft met...

An Individual Participant Data Meta-analysis: Behavioral Treatments for Children and Adolescents With Attention-Deficit/Hyperactivity Disorder

Published on date

28 April 2021

Published in

Journal of the American Academy of Child & Adolescent Psychiatry

Gedragstherapeutische interventies en medicatie behoren tot de effectief bevonden behandelmogelijkheden bij ADHD. Wanneer een gedragstherapeutische interventie geïndiceerd is, blijkt dat vooral kinderen met ernstige kenmerken van ADHD, kinderen met (kenmerken van) een gedragsstoornis en kinderen met ADHD van alleenstaande ouders erbij gebaat zijn om zo snel mogelijk gedragstherapeutische...

Effects of methylphenidate on executive functioning in children and adolescents with ADHD after long-term use: a randomized, placebo-controlled discontinuation study

Published on date

28 March 2021

Published in

Journal of Child Psychology & Psychiatry, and allied disciplines

Methylfenidaat (beter bekend als Ritalin of Concerta) kan de informatieverwerking (zoals aandacht en geheugen) van kinderen en jongeren met ADHD verbeteren. Het is nog onduidelijk of methylfenidaat na lang gebruik (meer dan 2 jaar) hierop nog steeds een effect heeft. 

Tackle your Tics: pilot findings of a brief, intensive group-based exposure therapy program for children with tic disorders

Published on date

March 2021

Published in

European Child and Adolescent Psychiatry

Gedragsgerichte behandelingen voor tics, zoals exposure/respons preventie (ERP) en habit reversal (HR) therapie, zijn effectief in het verminderen en beter hanteerbaar maken van tics. Medicatie voor de behandeling van tics heeft vaak ongewenste bijeffecten, en is daarom in de regel een tweede keuze. Echter de beschikbaarheid van gedragstherapie is vaak een probleem. Daarom is Tackle-your-Tics...

The Premonitory Urge for Tics Scale in a large sample of children and adolescents: psychometric properties in a developmental context. An EMTICS study

Published on date

October 2020

Published in

European Child and Adolescent Psychiatry

In dit onderzoek keken we naar zogenaamde ‘tic-alerts’. Tic-alerts, ook tic-alarmen genoemd, zijn lichamelijke prikkelingen die vaak voorafgaan aan een tic. Deze ‘tic-alerts’ spelen een belangrijke rol bij de gedragsbehandeling van tics. Tot nu toe dachten onderzoekers dat deze ‘tic-alerts’ pas rond het tiende jaar duidelijk aanwezig waren. We onderzochten de psychometrische kwaliteiten van de...

A graph theory study of resting-state functional connectivity in children with Tourette syndrome

Published on date

May 2020

Published in

Cortex

Hersengebieden communiceren met elkaar om informatie uit te wisselen. Bij het opgroeien veranderen verbindingen tussen bepaalde hersengebieden. Ze worden korter of langer, of dikker of dunner en meestal efficiënter. Dit kan worden gemeten middels MRI onderzoek (hersenscan) in rust. Er zijn ideeën dat er bij kinderen met tics sprake zou kunnen zijn van verbindingen die niet goed met elkaar...

Interventions for challenging behaviours of adults with intellectual disabilities

Nederlandse samenvatting.

Published on date

30 April 2020

Published in

J Intellect Disabil Res. 2020 Aug;64(8):561-578. doi: 10.1111/jir.12736. Epub 2020 Jun 17.

As part of the IBIS project we examined what is already known about interventions without medication for challenging behaviours of adults with intellectual disabilities. There are a lot of those interventions. However, it is unclear if these interventions are effective.

Executive functioning and emotion recognition in youth with oppositional defiant disorder and/or conduct disorder

Published on date

April 2020

Published in

The World Journal of Biological Psychiatry

Gedragsproblemen kunnen ontstaan door de manier waarop de hersenen werken. We weten alleen nog niet goed welke hersenfuncties een rol spelen. Daarom onderzochten wij verschillende functies in jeugd met gedragsproblemen en jeugd zonder gedragsproblemen. Ook keken we naar verschillen tussen opstandig gedrag (ODD) en normoverschrijdend gedrag (CD). 

Executive function in children with Tourette syndrome and attention-deficit/hyperactivity disorder: Cross-disorder or unique impairments?

Published on date

1 March 2020

Published in

Cortex

Kinderen met ADHD hebben vaak informatieverwerkingsproblemen. Zo doen ze het dikwijls minder goed op taken die cognitieve controle en werkgeheugen vereisen. Vaak reageren ze impulsief en doen dingen zonder nadenken. ADHD komt ook vaak voor bij kinderen met tics. In hoeverre kinderen met tics ook last hebben van informatieverwerkingsproblemen is onduidelijk. Daarom vergeleken we drie groepen...

De Novo Sequence and Copy Number Variants Are Strongly Associated with Tourette Disorder and Implicate Cell Polarity in Pathogenesis

Published on date

25 September 2018

Published in

Cell Reports

Wang S, Mandell JD, Kumar Y, Sun N, Morris MT, Arbelaez J, Nasello C, Dong S, Duhn C, Zhao X, Yang Z, Padmanabhuni SS, Yu D, King RA, Dietrich A, Khalifa N, Dahl N, Huang AY, Neale BM, Coppola G, Mathews CA, Scharf JM; Tourette International Collaborative Genetics Study (TIC Genetics); Tourette Syndrome Genetics Southern and Eastern Europe Initiative (TSGENESEE); Tourette Association of America...

Evaluating Sex and Age Differences in ADI-R and ADOS Scores in a Large European Multi-site Sample of Individuals with Autism Spectrum Disorder

Published on date

July 2018

Published in

Journal of Autism and Developmental Disorders

Tillmann J, Ashwood K, Absoud M, Bölte S, Bonnet-Brilhault F, Buitelaar JK, Calderoni S, Calvo R, Canal-Bedia R, Canitano R, De Bildt A, Gomot M, Hoekstra PJ, Kaale A, McConachie H, Murphy DG, Narzisi A, Oosterling I, Pejovic-Milovancevic M, Persico AM, Puig O, Roeyers H, Rommelse N, Sacco R, Scandurra V, Stanfield AC, Zander E, Charman T.

Analysis of shared heritability in common disorders of the brain

Published on date

22 June 2018

Published in

Science

Brainstorm Consortium, Anttila V, Bulik-Sullivan B, Finucane HK, Walters RK, Bras J, Duncan L, Escott-Price V, Falcone GJ, Gormley P, Malik R, Patsopoulos NA, Ripke S, Wei Z, Yu D, Lee PH, Turley P, Grenier-Boley B, Chouraki V, Kamatani Y,  Berr C, Letenneur L, Hannequin D, Amouyel P, Boland A, Deleuze JF, Duron E, Vardarajan BN, Reitz C, Goate AM, Huentelman MJ, Kamboh MI, Larson EB, Rogaeva...

De werking van oxytocine bij autisme

Published on date

1 June 2018

Published in

Wetenschappelijk Tijdschrift Autisme

Groen, Y., Althaus, M., Oosterhoff, M., van Balkom, I., & Hoekstra, P. J.

Response

Published on date

May 2018

Published in

Chest

van der Schans J, Hak E, Hoekstra PJ, de Vries TW.

Investigation of previously implicated genetic variants in chronic tic disorders: a transmission disequilibrium test approach

Published on date

April 2018

Published in

European Archives of Psychiatry and Clinical Neuroscience

Abdulkadir M, Londono D, Gordon D, Fernandez TV, Brown LW, Cheon KA, Coffey BJ, Elzerman L, Fremer C, Fründt O, Garcia-Delgar B, Gilbert DL, Grice DE, Hedderly T, Heyman I, Hong HJ, Huyser C, Ibanez-Gomez L, Jakubovski E, Kim YK, Kim YS, Koh YJ, Kook S, Kuperman S, Leventhal B, Ludolph AG, Madruga-Garrido M, Maras A, Mir P, Morer A, Müller-Vahl K, Münchau A, Murphy TL, Plessen KJ, Roessner V,...

More publications