R J Verkes

Summary

Affiliation: University Medical Center Nijmegen
Country: The Netherlands

Publications

  1. ncbi Mood correlates with blood serotonin, but not with glucose measures in patients with recurrent suicidal behavior
    R J Verkes
    Department of Psychiatry, University Hospital of Nijmegen, The Netherlands
    Psychiatry Res 80:239-48. 1998
  2. ncbi Cognitive performance and serotonergic function in users of ecstasy
    R J Verkes
    Centre for Human Drug Research, Leiden, The Netherlands
    Psychopharmacology (Berl) 153:196-202. 2001
  3. doi Ethanol co-administration moderates 3,4-methylenedioxymethamphetamine effects on human physiology
    G J H Dumont
    Department of Psychiatry, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
    J Psychopharmacol 24:165-74. 2010
  4. doi Acute psychomotor effects of MDMA and ethanol (co-) administration over time in healthy volunteers
    G J H Dumont
    Department of Psychiatry, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
    J Psychopharmacol 24:155-64. 2010
  5. doi Acute psychomotor, memory and subjective effects of MDMA and THC co-administration over time in healthy volunteers
    G J H Dumont
    Donders Institute for Brain, Cognition and Behaviour, Department of Psychiatry, Radboud University Nijmegen Medical Centre, The Netherlands
    J Psychopharmacol 25:478-89. 2011
  6. ncbi Feedback-related negativity codes outcome valence, but not outcome expectancy, during reversal learning
    A K L von Borries
    Department of Psychiatry, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
    Cogn Affect Behav Neurosci 13:737-46. 2013
  7. pmc Acute neuropsychological effects of MDMA and ethanol (co-)administration in healthy volunteers
    G J H Dumont
    Unit for Clinical Psychopharmacology and Neuropsychiatry UCPN, Department of Psychiatry, University Medical Centre St Radboud, Nijmegen, The Netherlands
    Psychopharmacology (Berl) 197:465-74. 2008
  8. ncbi Effects of allopregnanolone on sedation in men, and in women on oral contraceptives
    F van Broekhoven
    Department of Psychiatry, Unit for Clinical Psychopharmacology and Neuropsychiatry, Radboud University Nijmegen Medical Centre, P O Box 9101, 6500 HB Nijmegen, The Netherlands
    Psychoneuroendocrinology 32:555-64. 2007
  9. ncbi Increased oxytocin concentrations and prosocial feelings in humans after ecstasy (3,4-methylenedioxymethamphetamine) administration
    G J H Dumont
    Unit for Clinical Psychopharmacology and Neuropsychiatry, Department of Psychiatry, Radboud University Nijmegen Medical Centre, 966, PO Box 9101, Nijmegen NL 6500 HB, The Netherlands
    Soc Neurosci 4:359-66. 2009
  10. pmc Effect of apomorphine on cognitive performance and sensorimotor gating in humans
    Arnt F A Schellekens
    Department of Psychiatry, Radboud Medical Centre Nijmegen, 6500 HB Nijmegen, The Netherlands
    Psychopharmacology (Berl) 207:559-69. 2010

Collaborators

Detail Information

Publications17

  1. ncbi Mood correlates with blood serotonin, but not with glucose measures in patients with recurrent suicidal behavior
    R J Verkes
    Department of Psychiatry, University Hospital of Nijmegen, The Netherlands
    Psychiatry Res 80:239-48. 1998
    ..long-term effects. The results do support an association between serotonergic function and mood, but not between glucose metabolism and mood, in recurrent suicide attempters...
  2. ncbi Cognitive performance and serotonergic function in users of ecstasy
    R J Verkes
    Centre for Human Drug Research, Leiden, The Netherlands
    Psychopharmacology (Berl) 153:196-202. 2001
    ..The neurotoxic effects in humans are less clear and little is known about the functional consequences, although some studies suggest memory impairment. Given the widespread use of MDMA, our lack of knowledge raises concerns...
  3. doi Ethanol co-administration moderates 3,4-methylenedioxymethamphetamine effects on human physiology
    G J H Dumont
    Department of Psychiatry, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
    J Psychopharmacol 24:165-74. 2010
    ..In conclusion, co-administration of ethanol and MDMA did not exacerbate physiologic effects compared to all other drug conditions, and moderated some effects of MDMA alone...
  4. doi Acute psychomotor effects of MDMA and ethanol (co-) administration over time in healthy volunteers
    G J H Dumont
    Department of Psychiatry, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
    J Psychopharmacol 24:155-64. 2010
    ..These findings may have implications for general neuropsychological functioning as this may provide a sense of adequate performance that does not agree with a significant reduction in psychomotor accuracy...
  5. doi Acute psychomotor, memory and subjective effects of MDMA and THC co-administration over time in healthy volunteers
    G J H Dumont
    Donders Institute for Brain, Cognition and Behaviour, Department of Psychiatry, Radboud University Nijmegen Medical Centre, The Netherlands
    J Psychopharmacol 25:478-89. 2011
    ..However, co-administration of THC with MDMA increased desired subjective drug effects and drug strength compared with the MDMA condition, which may explain the widespread use of this combination...
  6. ncbi Feedback-related negativity codes outcome valence, but not outcome expectancy, during reversal learning
    A K L von Borries
    Department of Psychiatry, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
    Cogn Affect Behav Neurosci 13:737-46. 2013
    ..By contrast, the P300 reflects the updating of information relevant for behavior in a changing context...
  7. pmc Acute neuropsychological effects of MDMA and ethanol (co-)administration in healthy volunteers
    G J H Dumont
    Unit for Clinical Psychopharmacology and Neuropsychiatry UCPN, Department of Psychiatry, University Medical Centre St Radboud, Nijmegen, The Netherlands
    Psychopharmacology (Berl) 197:465-74. 2008
    ..Commonly, ecstasy is used in combination with other substances, in particular alcohol (ethanol). MDMA induces both arousing as well as hallucinogenic effects, whereas ethanol is a general central nervous system depressant...
  8. ncbi Effects of allopregnanolone on sedation in men, and in women on oral contraceptives
    F van Broekhoven
    Department of Psychiatry, Unit for Clinical Psychopharmacology and Neuropsychiatry, Radboud University Nijmegen Medical Centre, P O Box 9101, 6500 HB Nijmegen, The Netherlands
    Psychoneuroendocrinology 32:555-64. 2007
    ..Other pharmacokinetic parameters were not different between sexes. On the EEG, beta power increased in men. In conclusion, men and women on OC reacted differently to allopregnanolone...
  9. ncbi Increased oxytocin concentrations and prosocial feelings in humans after ecstasy (3,4-methylenedioxymethamphetamine) administration
    G J H Dumont
    Unit for Clinical Psychopharmacology and Neuropsychiatry, Department of Psychiatry, Radboud University Nijmegen Medical Centre, 966, PO Box 9101, Nijmegen NL 6500 HB, The Netherlands
    Soc Neurosci 4:359-66. 2009
    ..MDMA induces oxytocin release in humans, which may be involved in the characteristic prosocial effects of ecstasy...
  10. pmc Effect of apomorphine on cognitive performance and sensorimotor gating in humans
    Arnt F A Schellekens
    Department of Psychiatry, Radboud Medical Centre Nijmegen, 6500 HB Nijmegen, The Netherlands
    Psychopharmacology (Berl) 207:559-69. 2010
    ..The objective of the current study was to assess dopamine receptor functioning at the forebrain level...
  11. doi Cannabis coadministration potentiates the effects of "ecstasy" on heart rate and temperature in humans
    G J Dumont
    Department of Psychiatry, Donders Institute for Brain, Cognition, and Behavior, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
    Clin Pharmacol Ther 86:160-6. 2009
    ..These effects may be of particular relevance for the cardiovascular safety of ecstasy users who participate in energetic dancing in nightclubs with high ambient temperature...
  12. doi Neural correlates of error-related learning deficits in individuals with psychopathy
    A K L von Borries
    Radboud University Nijmegen Medical Centre, Donders Institute for Brain, Cognition and Behaviour, Department of Psychiatry, Nijmegen, The Netherlands
    Psychol Med 40:1559-68. 2010
    ..Psychopathy (PP) is associated with a performance deficit in a variety of stimulus-response and stimulus-reinforcement learning paradigms. We tested the hypothesis that failures in error monitoring underlie these learning deficits...
  13. doi Short term neurocognitive effects of treatment with ziprasidone and olanzapine in recent onset schizophrenia
    Nicoletta M J van Veelen
    Rudolf Magnus Institute of Neuroscience, Department of Psychiatry, University Medical Center Utrecht, Utrecht, The Netherlands
    Schizophr Res 120:191-8. 2010
    ..An earlier study conducted in chronic patients revealed an enhancement of cognition after treatment for both agents, but the extent of improvement was not significantly different between ziprasidone and olanzapine...
  14. ncbi The acute effects of MDMA and ethanol administration on electrophysiological correlates of performance monitoring in healthy volunteers
    D B Spronk
    Department of Psychiatry, Radboud University Medical Center, Postbox 9101, 6500 HB, Nijmegen, The Netherlands
    Psychopharmacology (Berl) 231:2877-88. 2014
    ..The error-related negativity (ERN), correct-related negativity (CRN), and N2 are electrophysiological indices of performance monitoring...
  15. ncbi A review of acute effects of 3,4-methylenedioxymethamphetamine in healthy volunteers
    G J H Dumont
    Unit for Clinical Psychopharmacology and Neuropsychiatry, Department of Psychiatry, Radboud University Medical Centre Nijmegen, The Netherlands
    J Psychopharmacol 20:176-87. 2006
    ....
  16. doi Treatment of unipolar psychotic depression: a randomized, double-blind study comparing imipramine, venlafaxine, and venlafaxine plus quetiapine
    J Wijkstra
    Rudolf Magnus Institute of Neuroscience, Department of Psychiatry, University Medical Center Utrecht, Utrecht, The Netherlands
    Acta Psychiatr Scand 121:190-200. 2010
    ..It remains unclear whether unipolar psychotic depression should be treated with an antidepressant and an antipsychotic or with an antidepressant alone...
  17. ncbi Oral progesterone decreases saccadic eye velocity and increases sedation in women
    F van Broekhoven
    Department of Psychiatry, Unit for Clinical Psychopharmacology and Neuropsychiatry, Radboud University Nijmegen Medical Centre, P O Box 9101, 6500 HB Nijmegen, The Netherlands
    Psychoneuroendocrinology 31:1190-9. 2006
    ..Administration of progesterone decreased SEV and increased sedation. This effect is probably due to enhanced GABA activity...