Fotograaf: Brenda Jansen

mw. dr. J. (Janna) Cousijn

  • Faculteit der Maatschappij- en Gedragswetenschappen
    Programmagroep: Developmental Psychology
  • Bezoekadres
    REC G
    Nieuwe Achtergracht 129  Kamernummer: 1.11
  • Postadres:
    Postbus  15916
    1001 NK  Amsterdam
    T: 0625690525

Janna Cousijn

I am a scientist with an interdisciplinary background in neurobiology, medicine and psychology. An intriguing question central to all my studies is why only some individuals develop an addiction after heavy substance use. I thereby study the interaction between motivational processes (reward, emotions) and cognitive control in the brain. I received my Doctorate Cum Laude (awarded <5%) for identifying predictors of cannabis dependence with a novel combination of neuroimaging techniques (structural MRI, functional MRI, connectivity analyses) and neuropsychological tasks applied to a large group of difficult to find cannabis users and closely matched controls. After finishing by PhD, I became a postdoc at Leiden University where I extended my knowledge on the study of atypical brain development in the context of mental disorders. In 2014 I moved to Utrecht University to work as an Associate Research Scientist responsible for theory development, study design and supervision of PhD students in a prestigious large-scale (6000 children) 10-year longitudinal neuroimaging study on atypical brain development (NWO Zwaartekracht). Recently, I was invited back at the University of Amsterdam as an assistant professor (Tenure) in Clinical Developmental Neuroscience.

Cannabis & the brain

Contribution to Science

Partly due to the ongoing discussion regarding the addictive potential of cannabis, compared to other substances of abuse, relatively little is known about the brain processes underlying regular cannabis use and dependence. An estimated 10 percent of the weekly cannabis users will develop a dependency. From both a fundamental and clinical perspective, it is crucial to delineate the effects of regular cannabis use versus cannabis dependence on brain and behavior. The overarching goal of my research is to fill this knowledge gap. I thereby made great progress 1) unraveling the neurobiology underlying cannabis dependence and 2) identifying predictors of the course of cannabis dependence, and 3) testing the validity and clinical value of our laboratory measures in different real-life settings, including treatment.

1) Neurobiology underlying cannabis use versus dependence. I have conducted several studies investigating brain structure, function and behavior in regular and dependent cannabis users. My results imply that motivational processes like craving, approach-bias and attentional-bias are already evident in regular cannabis users. In contrast, cognitive control deficits and malfunctioning of the underlying brain systems may only occur in those cannabis users whom are dependent, covarying with the severity of the cannabis use-related problems. My work thereby profiled brain structure and function in cannabis user with and without problems, fostering a well informed and balanced view on the effects of cannabis use and dependence on the brain.

2) Predictors of the course of cannabis dependence. Using different neuropsychological tasks and MRI techniques, I studied the predictive association between brain function and future cannabis use is clinical and subclinical populations. I thereby revealed that both motivational (e.g., approach-bias, craving) and control (working-memory) related processes can predict the escalation of cannabis use towards dependence, and relapse after treatment. I embrace a multimodal approach, combining and comparing behavioral, self-reported and neural measures. Importantly, the results showed that neural measures explained unique variance in future cannabis use, on top of more simpler and cheaper behavioral measures.

3) Mechanisms underlying approach-bias: from neuroscience to treatment. The automatic tendency to approach drugs (i.e., approach-bias) shows great potency as a predictor of problematic drug use and as a target for treatment. However, little is known about the underlying mechanisms. Through studies investigating the expression of approach-bias within different contexts (e.g., real-life, laboratory and clinical settings, emotional context) I advanced the knowledge on the underlying behavioral and neural mechanisms. In collaboration with multiple international research groups I successfully studied the mechanisms of chance underlying approach-bias retraining in different drug-using populations to unravel for whom the training works.


  • ENIGMA Addiction Working Group (2018). Mega-Analysis of Gray Matter Volume in Substance Dependence: General and Substance-Specific Regional Effects. The American Journal of Psychiatry, appiajp201817040415. DOI: 10.1176/appi.ajp.2018.17040415 
  • Labots, M., Cousijn, J., Jolink, L. A., Kenemans, J. L., Vanderschuren, L. J. M. J., & Lesscher, H. M. B. (2018). Age-Related Differences in Alcohol Intake and Control Over Alcohol Seeking in Rats. Frontiers in Psychiatry, 9, [419]. DOI: 10.3389/fpsyt.2018.00419  [details] 
  • Chye, Y., Lorenzetti, V., Suo, C., Batalla, A., Cousijn, J., Goudriaan, A. E., ... Solowij, N. (2018). Alteration to hippocampal volume and shape confined to cannabis dependence: a multi-site study. Addiction Biology. DOI: 10.1111/adb.12652 
  • Cousijn, J., & van Duijvenvoorde, A. C. K. (2018). Cognitive and Mental Health Predictors of Withdrawal Severity During an Active Attempt to Cut Down Cannabis Use. Frontiers in Psychiatry, 9, [301]. DOI: 10.3389/fpsyt.2018.00301  [details] 
  • Kong, X-Z., Mathias, S. R., Guadalupe, T., ENIGMA Laterality Working Group, Glahn, D. C., Franke, B., ... Cousijn, J. (2018). Mapping cortical brain asymmetry in 17,141 healthy individuals worldwide via the ENIGMA Consortium. Proceedings of the National Academy of Sciences of the United States of America, 115(22), E5154-E5163. DOI: 10.1073/pnas.1718418115  [details] 
  • Cousijn, J., Núñez, A. E., & Filbey, F. M. (2018). Time to acknowledge the mixed effects of cannabis on health: a summary and critical review of the NASEM 2017 report on the health effects of cannabis and cannabinoids. Addiction, 113(5), 958-966. DOI: 10.1111/add.14084  [details] 
  • Leeman, R. F., Nogueira, C., Wiers, R. W., Cousijn, J., Serafini, K., DeMartini, K. S., ... O'Malley, S. S. (2018). A Test of Multisession Automatic Action Tendency Retraining to Reduce Alcohol Consumption Among Young Adults in the Context of a Human Laboratory Paradigm. Alcoholism - Clinical and Experimental Research, 42(4), 803-814. DOI: 10.1111/acer.13613  [details] 
  • Cousijn, J., Luijten, M., & Feldstein Ewing, S. W. (2018). Adolescent resilience to addiction: a social plasticity hypothesis. The Lancent Child & Adolescent Health, 2(1), 69-78. DOI: 10.1016/S2352-4642(17)30148-7  [details] 
  • Peeters, M., & Cousijn, J. (Accepted/In press). Development of alcohol use. In S. Hupp, & J. Jewell (Eds.), The encyclopaedia of child and adolescent development (pp. 1). Chicester, UK: Wiley-Blackwell.


  • Chye, Y., Solowij, N., Ganella, E. P., Suo, C., Yücel, M., Batalla, A., ... Lorenzetti, V. (2017). Role of orbitofrontal sulcogyral pattern on lifetime cannabis use and depressive symptoms. Progress in Neuro-Psychopharmacology & Biological Psychiatry, 79(B), 392-400. DOI: 10.1016/j.pnpbp.2017.07.017  [details] 
  • Weckler, H., Kong, G., Larsen, H., Cousijn, J., Wiers, R. W., & Krishnan-Sarin, S. (2017). Impulsivity and approach tendencies towards cigarette stimuli: Implications for cigarette smoking and cessation behaviors among youth. Experimental and Clinical Psychopharmacology, 25(5), 363-372. DOI: 10.1037/pha0000139  [details] 
  • Chye, Y., Solowij, N., Suo, C., Batalla, A., Cousijn, J., Goudriaan, A. E., ... Yücel, M. (2017). Orbitofrontal and caudate volumes in cannabis users: a multi-site mega-analysis comparing dependent versus non-dependent users. Psychopharmacology, 234(13), 1985-1995. DOI: 10.1007/s00213-017-4606-9  [details] 
  • Cousijn, J., Hessels, R. S., Van der Stigchel, S., & Kemner, C. (2017). Evaluation of the Psychometric Properties of the Gap-Overlap Task in 10-Month-Old Infants. Infancy, 22(4), 571-579. DOI: 10.1111/infa.12185  [details] 
  • Koenders, L., Lorenzetti, V., de Haan, L., Suo, C., Vingerhoets, W. A. M., van den Brink, W., ... Cousijn, J. (2017). Longitudinal study of hippocampal volumes in heavy cannabis users. Journal of Psychopharmacology, 31(8), 1027-1034. DOI: 10.1177/0269881117718380  [details] 
  • Prashad, S., Milligan, A. L., Cousijn, J., & Filbey, F. M. (2017). Cross-Cultural Effects of Cannabis Use Disorder: Evidence to Support a Cultural Neuroscience Approach. Current Addiction Reports, 4(2), 100-109. DOI: 10.1007/s40429-017-0145-z  [details] 


  • Koenders, L., Cousijn, J., Vingerhoets, W. A. M., van den Brink, W., Wiers, R. W., Meijer, C. J., ... de Haan, L. (2016). Grey Matter Changes Associated with Heavy Cannabis Use: A Longitudinal sMRI Study. PLoS One, 11(5), [e0152482]. DOI: 10.1371/journal.pone.0152482  [details] 
  • Lobbestael, J., Cousijn, J., Brugman, S., & Wiers, R. W. (2016). Approach and avoidance towards aggressive stimuli and its relation to reactive and proactive aggression. Psychiatry Research, 240, 196-201. DOI: 10.1016/j.psychres.2016.04.038  [details] 
  • Lorenzetti, V., Alonso-Lana, S., Youssef, G. J., Verdejo-Garcia, A., Suo, C., Cousijn, J., ... Solowij, N. (2016). Adolescent cannabis use: What is the evidence for functional brain alteration? Current pharmaceutical design, 22(42), 6353-6365. DOI: 10.2174/1381612822666160805155922  [details] 
  • Lorenzetti, V., Batalla, A., & Cousijn, J. (2016). Cannabis Use Disorders and Altered Brain Morphology: Where is the evidence? Current Addiction Reports, 3(2), 189-198. DOI: 10.1007/s40429-016-0102-2  [details] 
  • Lorenzetti, V., & Cousijn, J. (2016). Cannabis use disorders and brain morphology. In V. R. Preedy (Ed.), Neuropathology of drug addictions and substance misuse. - Vol. 1: Foundations of Understanding, tobacco, alcohol, cannabinoids and opioids (pp. 773-785). London: Elsevier Inc.. [details] 
  • Lorenzetti, V., Cousijn, J., Solowij, N., Garavan, H., Chao, S., Yücel, M., & Verdejo-García, A. (2016). The neurobiology of cannabis use disorders: A call for evidence. Frontiers in Behavioral Neuroscience, 10(86). DOI: 10.3389/fnbeh.2016.00086  [details] 
  • Mackey, S., Kan, K-J., Chaarani, B., Alia-Klein, N., Batalla, A., Brooks, S., ... Conrod, P. (2016). Genetic imaging consortium for addiction medicine: From neuroimaging to genes. Progress in Brain Research, 224, 203-223. DOI: 10.1016/bs.pbr.2015.07.026  [details] 
  • Vingerhoets, W. A. M., Koenders, L., van den Brink, W. P., Wiers, R. W., Goudriaan, A. E., van Amelsvoort, T., ... Cousijn, J. (2016). Cue-induced striatal activity in frequent cannabis users independently predicts cannabis problem severity three years later. Journal of Psychopharmacology, 30(2), 152-158. DOI: 10.1177/0269881115620436  [details] 


  • Lindgren, K. P., Wiers, R. W., Teachman, B. A., Gasser, M. L., Westgate, E. C., Cousijn, J., ... Neighbors, C. (2015). Attempted training of alcohol approach and drinking identity associations in US undergraduate drinkers: null results from two studies. PLoS One, 10(8), [e0134642]. DOI: 10.1371/journal.pone.0134642  [details] 
  • Cousijn, J. (2015). Embracing comorbidity: a way towards understanding the role of motivational and control processes in cannabis use disorders. Frontiers in Psychology, 6, [677]. DOI: 10.3389/fpsyg.2015.00677  [details] 
  • Cousijn, J., & Filbey, F. (2015). New approaches to treating cannabis dependence: from neuroscience to practice. In S. W. Feldstein Ewing, K. Witkiewitz, & F. M. Filbey (Eds.), Neuroimaging and psychosocial addiction treatment: an integrative guide for researchers and clinicians (pp. 97-110). Basingstoke: Palgrave Macmillan. DOI: 10.1057/9781137362650_7  [details] 
  • Cousijn, J., van Benthem, P., van der Schee, E., & Spijkerman, R. (2015). Motivational and control mechanisms underlying adolescent cannabis use disorders: a prospective study. Developmental Cognitive Neuroscience, 16, 36-45. DOI: 10.1016/j.dcn.2015.04.001  [details] 
  • Brom, M., Laan, E., Everaerd, W., Spinhoven, P., Cousijn, J., & Both, S. (2015). The influence of emotion down-regulation on the expectation of sexual reward. Behavior Therapy, 46(3), 379-394. DOI: 10.1016/j.beth.2015.01.005  [details] 
  • Kong, G., Larsen, H., Cavallo, D. A., Becker, D., Cousijn, J., Salemink, E., ... Krishnan-Sarin, S. (2015). Re-training automatic action tendencies to approach cigarettes among adolescent smokers: a pilot study. The American Journal of Drug and Alcohol Abuse, 41(5), 425-432. DOI: 10.3109/00952990.2015.1049492  [details] 
  • van den Boomen, C., Jonkman, L. M., Jaspers-Vlamings, P. H. J. M., Cousijn, J., & Kemner, C. (2015). Developmental changes in ERP responses to spatial frequencies. PLoS One, 10(3), [e0122507]. DOI: 10.1371/journal.pone.0122507  [details] 


  • Cousijn, J., Luijten, M., & Wiers, R. W. (2014). Mechanisms underlying alcohol-approach action tendencies: the role of emotional primes and drinking motives. Frontiers in Psychiatry, 5, 44. [44]. DOI: 10.3389/fpsyt.2015.00044  [details] 
  • Cousijn, J., Vingerhoets, W. A. M., Koenders, L., de Haan, L., van den Brink, W., Wiers, R. W., & Goudriaan, A. E. (2014). Relationship between working-memory network function and substance use: a 3-year longitudinal fMRI study in heavy cannabis users and controls. Addiction Biology, 19(2), 282-293. DOI: 10.1111/adb.12111  [details] 
  • Cousijn, J., Zanolie, K., Munsters, R. J. M., Kleibeuker, S. W., & Crone, E. A. (2014). The relation between resting state connectivity and creativity in adolescents before and after training. PLoS One, 9(9), e105780. [e105780]. DOI: 10.1371/journal.pone.0105780  [details] 
  • Cousijn, J., Koolschijn, P. C. M. P., Zanolie, K., Kleibeuker, S. W., & Crone, E. A. (2014). The relation between gray matter morphology and divergent thinking in adolescents and young adults. PLoS One, 9(12), e114619. [e114619]. DOI: 10.1371/journal.pone.0114619  [details] 
  • Cousijn, J., Wiers, R. W., Ridderinkhof, K. R., van den Brink, W., Veltman, D. J., & Goudriaan, A. E. (2014). Effect of baseline cannabis use and working-memory network function on changes in cannabis use in heavy cannabis users: a prospective fMRI study. Human Brain Mapping, 35(5), 2470-2482. DOI: 10.1002/hbm.22342  [details] 
  • Larsen, H., Kong, G., Becker, D., Cousijn, J., Boendermaker, W., Cavallo, D., ... Wiers, R. (2014). Implicit motivational processes underlying smoking in American and Dutch adolescents. Frontiers in Psychiatry, 5, 51. [51]. DOI: 10.3389/fpsyt.2015.00051  [details] 
  • Schulte, M. H. J., Cousijn, J., den Uyl, T. E., Goudriaan, A. E., van den Brink, W., Veltman, D. J., ... Wiers, R. W. (2014). Recovery of neurocognitive functions following sustained abstinence after substance dependence and implications for treatment. Clinical Psychology Review, 34(7), 531-550. DOI: 10.1016/j.cpr.2014.08.002  [details] 
  • Gainsbury, S. M., Blankers, M., Wilkinson, C., Schelleman-Offermans, K., & Cousijn, J. (2014). Recommendations for international gambling harm-minimisation guidelines: comparison with effective public health policy. Journal of Gambling Studies, 30(4), 771-788. DOI: 10.1007/s10899-013-9389-2  [details] 
  • Koenders, L., Machielsen, M. W., van der Meer, F. J., van Gasselt, A. C., Meijer, C. J., van den Brink, W., ... de Haan, L. (2014). Brain volume in male patients with recent onset schizophrenia with and without cannabis use disorders. Journal of Psychiatry & Neuroscience, 39(6), 140081. [140081]. DOI: 10.1503/jpn.140081  [details] 


  • Beraha, E. M., Cousijn, J., Hermanides, E., Goudriaan, A. E., & Wiers, R. W. (2013). Implicit associations and explicit expectancies toward cannabis in heavy cannabis users and controls. Frontiers in Psychiatry, 4, 59. [59]. DOI: 10.3389/fpsyt.2015.00059  [details] 
  • Cousijn, J., Snoek, R. W. M., & Wiers, R. W. (2013). Cannabis intoxication inhibits avoidance action tendencies: a field study in the Amsterdam coffee shops. Psychopharmacology, 229(1), 167-176. DOI: 10.1007/s00213-013-3097-6  [details] 
  • Cousijn, J., Goudriaan, A. E., Ridderinkhof, K. R., van den Brink, W., Veltman, D. J., & Wiers, R. W. (2013). Neural responses associated with cue-reactivity in frequent cannabis users. Addiction Biology, 18(3), 570-580. DOI: 10.1111/j.1369-1600.2011.00417.x  [details] 
  • Cousijn, J., Watson, P., Koenders, L., Vingerhoets, W. A. M., Goudriaan, A. E., & Wiers, R. W. (2013). Cannabis dependence, cognitive control and attentional bias for cannabis words. Addictive Behaviors, 38(12), 2825-2832. DOI: 10.1016/j.addbeh.2013.08.011  [details] 
  • Cousijn, J., Wiers, R. W., Ridderinkhof, K. R., van den Brink, W., Veltman, D. J., Porrino, L. J., & Goudriaan, A. E. (2013). Individual differences in decision making and reward processing predict changes in cannabis use: a prospective functional magnetic resonance imaging study. Addiction Biology, 18(6), 1013-1023. DOI: 10.1111/j.1369-1600.2012.00498.x  [details] 
  • Watson, P., de Wit, S., Cousijn, J., Hommel, B., & Wiers, R. W. (2013). Motivational mechanisms underlying the approach bias to cigarettes. Journal of Experimental Psychopathology, 4(3), 250-262. DOI: 10.5127/jep.030512  [details] 


  • Cousijn, J., Goudriaan, A. E., Ridderinkhof, K. R., van den Brink, W., Veltman, D. J., & Wiers, R. W. (2012). Approach-bias predicts development of cannabis problem severity in heavy cannabis users: results from a prospective FMRI study. PLoS One, 7(9), [e42394]. DOI: 10.1371/journal.pone.0042394  [details] 
  • Cousijn, J., Wiers, R. W., Ridderinkhof, K. R., van den Brink, W., Veltman, D. J., & Goudriaan, A. E. (2012). Grey matter alterations associated with cannabis use: results of a VBM study in heavy cannabis users and healthy controls. NeuroImage, 59(4), 3845-3851. DOI: 10.1016/j.neuroimage.2011.09.046  [details] 


  • Cousijn, J., Goudriaan, A. E., & Wiers, R. W. (2011). Reaching out towards cannabis: approach-bias in heavy cannabis users predicts changes in cannabis use. Addiction, 106(9), 1667-1674. DOI: 10.1111/j.1360-0443.2011.03475.x  [details] 
  • Schmaal, L., Berk, L., Hulstijn, K. P., Cousijn, J., Wiers, R. W., & van den Brink, W. (2011). Efficacy of N-acetylcysteine in the treatment of nicotine dependence: a double-blind placebo-controlled pilot study. European Addiction Research, 17(4), 211-216. DOI: 10.1159/000327682  [details] 
  • Veeneman, M. M. J., Boleij, H., Broekhoven, M. H., Snoeren, E. M. S., Guitart Masip, M., Cousijn, J., ... Vanderschuren, L. J. M. J. (2011). Dissociable roles of mGlu5 and dopamine receptors in the rewarding and sensitizing properties of morphine and cocaine. Psychopharmacology, 214(4), 863-876. DOI: 10.1007/s00213-010-2095-1  [details] 


  • Creemers, H., Cousijn, J., & Wiers, R. (2015). Stoornis in cannabisgebruik. In I. Franken, P. Muris, & D. Denys (Eds.), Psychopathologie: oorzaken, diagnostiek en behandeling (pp. 743-754). Utrecht: De Tijdstroom. [details] 


  • Wiers, R. W., Cousijn, J., ter Mors-Schulte, M., den Uyl, T., Goudriaan, A., Schilt, T., ... van den Brink, W. (2012). State of the art: neurocognitieve effecten van verslaving. Den Haag: ZonMw. [details] 


  • Larsen, H., Kong, G., Becker, D., Cavallo, D. A., Cousijn, J., Salemink, E., ... Wiers, R. (2015). Cognitive bias modification combined with cognitive behavioral therapy: A smoking cessation intervention for adolescents. Drug and Alcohol Dependence, 146, [e168]. DOI: 10.1016/j.drugalcdep.2014.09.374 


  • Cousijn, J. & Filbey, F. (2017). National Institute of Drug Abuse RO1 (Project ID:1R01DA042490-01A1, 2.500.000 American Dollar, role: PI): The Role of Motivation and Control in Cannabis Use Disorders: A Cross-Cultural Longitudinal Neuroimaging Study.
  • Cousijn, J. & Willhun, I. (2017). Amsterdam Brain and Cognition project grant (250.000 Euro, role: PI): Unraveling adolescent risk and resilience to alcohol: A parallel fMRI study in humans and rats.
  • Cousijn, J. (2016). APS Rising star.
  • Cousijn, J. (2016). NHMRC Project Grant 2016, Australia (Project ID: APP1130079, 732.000 Australian Dollar, role: co-I): Characterising neurobiological abnormalities in Cannabis Use Disorders. Collaboralion with dr. N Solowij, dr. V Lorenzetti, dr. A Verdejo-Garcia, prof. dr. J Copeland..
  • Cousijn, J. (2016). American Psychological Association, travel award (500 American Dollars).
  • Cousijn, J. (2015). DOY-grant, Utrecht University (100.000 Euro, role: co-PI). Unraveling adolescent risk and resilience to alcohol use disorders. Collaboration with dr. HMB Lesscher and prof. LJM Vanderschuren.
  • Cousijn, J. (2012). IVO addiction masterclass, the Netherlands, best paper award 2012 (2.500 Euro).
  • Cousijn, J. (2011). National Institute Drug Abuse, US, travel award 2011 (1.300 Euro).

Wetenschappelijke positie

  • Cousijn, J. (2015). Chair and organizer of symposium ‘Behavior in context: a neuro-cognitive, behavioral and educational perspective on cognition and adolescent (…), International Convention of Psychological Science.
  • Cousijn, J. (2015). Chair and organizer of symposium ‘From impulsivity to habit? Neuropsychopharmacological mechanisms underlying addiction’, Congress of The European College of Neuropsychopharmacology.


  • Cousijn, J. (31-05-2018). Een cannabisverslaving kan net zo destructief zijn als heroïneverslaving [Web] Folia. Een cannabisverslaving kan net zo destructief zijn als heroïneverslaving.
  • Cousijn, J. (08-05-2017). UvA-onderzoeker Janna Cousijn: 'Omarm de twee gezichten van wiet' [Print] Parool. UvA-onderzoeker Janna Cousijn: 'Omarm de twee gezichten van wiet'.


  • Cousijn, J. (member of editorial board) (2017). Addiction (Journal).
  • Cousijn, J. (member of editorial board) (2017). Current Addiction Reports (Journal).
  • Cousijn, J. (editor) (2016). Addiction (Journal).


  • Cousijn, J. (invited speaker) (6-8-2016). Can we use neurocognitive functions to predict the course of cannabis use and dependence?, American Psychological Association Annual Convention, Denver, USA.
  • Cousijn, J. (invited speaker) (26-6-2016). Staying in control? The role of behavioral control in the course of cannabis use towards dependence, Research Society on Alcoholism, New Orleans, USA.
  • Cousijn, J. (speaker) (28-8-2015). Tracking development of behavioral control: Introduction to the Dutch Consortium on Individual Development, Annual Meeting of the International Society for Research on Impulsivity, Amsterdam, Netherlands.
  • Cousijn, J. (speaker) (13-3-2015). Approach and avoidance tendencies in substance users: the role of context, The International Convention of Psychological Science (ICPS), Amsterdam, the Netherlands.
  • Cousijn, J. (invited speaker) (23-7-2013). Cannabis approach and avoidance in the brain: a novel predictor of future cannabis problems, 7th World Conference for Behavioural and Cognitive Therapies, Lima, Peru.
  • Cousijn, J. (speaker) (16-2-2013). Can we use brain function to predict the course of cannabis use towards dependence?, 3rd International Conference on Applications of Neuroimaging to Alcoholism, New Haven, United States.


  • Cousijn, J. (organiser) (2015). Member of the organizing committee of the International Society for Research on Impulsivity meeting, Amsterdam, The Netherlands (organising a conference, workshop, ...).
  • Cousijn, J. (organiser) (31-8-2015). 28th Congress of the European College of Neuropsychopharmacology, Amsterdam, Netherlands. Chair and organizer of symposium ‘From impulsivity to habit? Neuropsychopharmacological mechanisms underlying addiction’ (organising a conference, workshop, ...).
  • Cousijn, J. (organiser) (13-3-2015). The International Convention of Psychological Science (ICPS), Amsterdam, the Netherlands. Chair and organizer of symposium ‘Behavior in context: a neuro-cognitive, behavioral and educational perspective on cognition and adolescent (…) (organising a conference, workshop, ...).
  • Cousijn, J. (organiser) (30-5-2012). 10th Dutch Endo-Neuro-Psycho meeting, Lunteren, Netherlands. Chair and organizer of symposium ‘Boosting cognitive control in addiction’ (organising a conference, workshop, ...).
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