Iris Sommer


Prof. Iris Sommer

  • psychoses
31 88 756365


I obtained my PhD in 2004 cum laude on language lateralization in schizophrenia.  After I finished my psychiatry residencies I worked as a psychiatrist in UMCU where I started the Voices Clinic. I started a research group investigating the pathophysiology of hallucinations and developed an interest in the treatment of schizophrenia.

I have several positions in editotial boards and committees:

  1. Elected member of the Young Academy of the Royal Dutch Academy of Arts and Science (DJA of KNAW)
  2. Invited member of AcademiaNet (500 leading women in science), headed by Angela Merckel
  3. Associate editor at Schizophrenia Bulletin (neuro-imaging section),
  4. Chair of the Dutch ZonMW program "Memorabel", part of the Deltaplan Dementie
  5. Member of the International Advisory Council SIRS (Schizophrenia International Research Society), 
  6. Member of the Steering Committee of the International Consortium on Hallucination Research
  7. Chair of the Scientific Committee of the Dutch Psychiatry Association 
  8. Member of the Dutch Committee for Research Integrity (Landelijk Orgaan Wetenschappelijke Integriteit)
  9. Member of the KNAW (Royal Dutch Academy of Arts and Sciences) Jury of the Heineken Medicine Price 
  10. Member of the KNAW (Royal Dutch Academy of Arts and Sciences) Committee KNAW-agenda large-scale research facilities (grootschalige onderzoeksfaciliteiten)

Research line and group

Research line
Pathophysiology and treatment of psychosis
Number of PhD students
Number of postdocs

Personal fellowships and awards

  • 2005 Veni ZONMW € 200,000, nr. 916.56.172
  • 2008 Clinical Fellowship ZonMW €160,000, nr. 40-00703-97-270
  • 2009 Vidi, ZonMW €800,000, nr. 017.106.301
  • 2012: Stanley foundation USA, $491,000 12T-008
  • 2012: Stanley foundation USA, $475,000, and 12T-009

Most recent key publications

  • Sommer IE, de Kort GA, Meijering AL, Dazzan P, Hulshoff Pol HE, Kahn RS, van Haren NE. How Frequent Are Radiological Abnormalities in Patients With Psychosis? A Review of 1379 MRI Scans. Schizophr Bull, 2012 Mar 13, Epub ahead of print
  • Sommer IE, de Witte L, Begemann M, Kahn RS. Nonsteroidal anti-inflammatory drugs in schizophrenia: ready for practice or a good start? A meta-analysis. J Clin Psychiatry, 2012 73(4):414-419.
  • Sommer IE, Slotema CW, Daskalakis J, Derks EM, Blom JD, van der Gaag M. The treatment of hallucinations in schizophrenia Schizophrenia Bulletin, 2012 Jun;38(4):704-14
  • Howes O, Shotbold PJ, Daalman K, Diederen KMJ, Kahn RS, Sommer IE. Dopaminergic function in the psychosis spectrum: an [18F]-DOPA imaging study in healthy individuals with auditory hallucinations. Schizophrenia Bulletin 2012 January 26
  • Sommer IE, Aleman A, Slotema CM, Schutter DJ. Transcranial stimulation for psychosis: the relationship between effect size and published findings. Am J Psychiatry, 2012 169(11):1211