As a researcher, Maj is especially known for his contributions in the area of bipolar disorder, including the clinical characterization of rapid cycling, mixed states,
and psychotic depression, and the study of the determinants of response to prophylaxis with lithium salts.
He has also produced widely quoted editorials on the concept of psychiatric comorbidity, conflicts of interests in psychiatry, and DSM-5 operational diagnostic criteria for schizophrenia.
References
↑Maj M, Pirozzi R, Formicola AM, Tortorella A. Reliability and validity of four alternative definitions of rapid-cycling bipolar disorder. American Journal of Psychiatry. 1999; 156: 1421-4.
↑Maj M, Pirozzi R, Magliano L, Bartoli L. Agitated depression in bipolar I disorder: prevalence, phenomenology, and outcome. American Journal of Psychiatry. 2003; 160: 2134-40.
↑Maj M, Pirozzi R, Magliano L, Fiorillo A, Bartoli L. Phenomenology and prognostic significance of delusions in major depressive disorder: a 10-year prospective follow-up study. Journal of Clinical Psychiatry. 2007; 68: 1411-7.
↑Maj M, Pirozzi R, Magliano L, Bartoli L. Long-term outcome of lithium prophylaxis in bipolar disorder: a 5-year prospective study of 402 patients at a lithium clinic. American Journal of Psychiatry. 1998; 155: 30-5.
↑Maj M. "Psychiatric comorbidity": an artefact of current diagnostic systems? British Journal of Psychiatry. 2005; 186: 182-4.
↑Maj M. Non-financial conflicts of interests in psychiatric research and practice. British Journal of Psychiatry. 2008; 193: 91-2.
↑Maj M. Critique of the DSM-IV operational diagnostic criteria for schizophrenia. British Journal of Psychiatry. 1998; 172: 458-60.