Publications 2025

Flagstad E, Hummelen B, Moen E, Dammen T, Haaland Å, Sunde T, Hansen B, Johnsen DS, Woods D, Grøtte T (2025)
Early maladaptive schemas in trichotillomania and skin-picking disorder: their relationships with symptom severity and subtypes
BMC Psychol, 13 (1), 789
DOI 10.1186/s40359-025-03096-y, PubMed 40665464

Malkomsen A, Wilberg T, Bull-Hansen B, Dammen T, Evensen JH, Hummelen B, Løvgren A, Osnes K, Ulberg R, Røssberg JI (2025)
Comparative effectiveness of short-term psychodynamic psychotherapy and cognitive behavioral therapy for major depression in psychiatric outpatient clinics: a randomized controlled trial
BMC Psychiatry, 25 (1), 113
DOI 10.1186/s12888-025-06544-6, PubMed 39934737

Paap MCS, Lortz SAJ, Hummelen B, Fjermestad-Noll J, Kvarstein EH, Pedersen G (2025)
An Investigation of Longitudinal Measurement Invariance and Item Response Theory Analysis of the LPFS-BF 2.0 in a Large Clinical Norwegian Sample
Personal Ment Health, 19 (3), e70032
DOI 10.1002/pmh.70032, PubMed 40654158

Publications 2024

Eikeseth FF, Pedersen G, Hummelen B, Sütterlin S, Stubhaug A, Kvarstein EH, Kvarstein G (2024)
Pain prevalence rates and the mediating role of negative affect in adults referred to personality disorder treatment: A cross-sectional study
J Pain, 26, 104724
DOI 10.1016/j.jpain.2024.104724, PubMed 39481671

Publications 2023

Bekk M, Meland KJ, Moen E, Nøstvik LI, Gausdal AL, Hummelen B (2023)
Group-based comprehensive behavioral intervention for tics (CBIT) for adults with Tourette syndrome or chronic tic disorders: A pilot study
Scand J Psychol, 64 (6), 784-793
DOI 10.1111/sjop.12942, PubMed 37339108

Frans N, Hummelen B, Albers CJ, Paap MCS (2023)
Visualizing Uncertainty to Promote Clinicians' Understanding of Measurement Error
Assessment, 30 (8), 2449-2460
DOI 10.1177/10731911221147042, PubMed 36726201

Heltne A, Frans N, Hummelen B, Falkum E, Germans Selvik S, Paap MCS (2023)
A systematic review of measurement uncertainty visualizations in the context of standardized assessments
Scand J Psychol, 64 (5), 595-608
DOI 10.1111/sjop.12918, PubMed 37259691

Kvarstein EH, Frøyhaug M, Pettersen MS, Carlsen S, Ekberg A, Fjermestad-Noll J, Ulvestad DA, Gikling EL, Hjermann E, Lindberget K, Omvik S, Eikenæs IU, Hummelen B, Morken KTE, Wilberg T, Pedersen GAF (2023)
Improvement of personality functioning among people treated within personality disorder mental health services. A longitudinal, observational study
Front Psychiatry, 14, 1163347
DOI 10.3389/fpsyt.2023.1163347, PubMed 37229394

Paap MCS, Pedersen G, Kvarstein E, Hummelen B (2023)
Evaluating the Construct Validity of the Norwegian Version of the Level of Personality Functioning Scale - Brief Form 2.0 in a Large Clinical Sample
J Pers Assess, 106 (1), 49-59
DOI 10.1080/00223891.2023.2182694, PubMed 36897004

Sveen CA, Pedersen G, Hummelen B, Kvarstein EH (2023)
Personality disorders: the impact of severity on societal costs
Eur Arch Psychiatry Clin Neurosci, 275 (1), 181-192
DOI 10.1007/s00406-023-01715-6, PubMed 37991536

Publications 2022

Heltne A, Braeken J, Hummelen B, Germans Selvik S, Buer Christensen T, Paap MCS (2022)
Do Flexible Administration Procedures Promote Individualized Clinical Assessments? An Explorative Analysis of How Clinicians Utilize the Funnel Structure of the SCID-5-AMPD Module I: LPFS
J Pers Assess, 105 (5), 636-646
DOI 10.1080/00223891.2022.2152344, PubMed 36511879

Hummelen B, Ulltveit-Moe Eikenæs I, Wilberg T (2022)
Is the alternative model for personality disorders able to capture avoidant personality disorder according to Section II of the DSM-5? A systematic review
Personal Disord, 13 (4), 412-417
DOI 10.1037/per0000553, PubMed 35787131

Korsgaard HO, Ulberg R, Hummelen B, Midgley N, Thorén A, Dahl HJ (2022)
Personality Disorders as a Possible Moderator of the Effects of Relational Interventions in Short-Term Psychoanalytic Psychotherapy with Depressed Adolescents
Int J Environ Res Public Health, 19 (17)
DOI 10.3390/ijerph191710952, PubMed 36078667

Nysaeter TE, Hummelen B, Christensen TB, Eikenaes IU, Selvik SG, Pedersen G, Bender DS, Skodol AE, Paap MCS (2022)
The Incremental Utility of Criteria A and B of the DSM-5 Alternative Model for Personality Disorders for Predicting DSM-IV/DSM-5 Section II Personality Disorders
J Pers Assess, 105 (1), 111-120
DOI 10.1080/00223891.2022.2039166, PubMed 35285763

Pedersen G, Wilberg T, Hummelen B, Hartveit Kvarstein E (2022)
The Norwegian network for personality disorders - development, contributions and challenges through 30 years
Nord J Psychiatry, 77 (5), 512-520
DOI 10.1080/08039488.2022.2147995, PubMed 36409693

Schønning T, Dahl HJ, Hummelen B, Ulberg R (2022)
Do Sleep Disturbances Improve Following Psychoanalytic Psychotherapy for Adolescent Depression?
Int J Environ Res Public Health, 19 (3)
DOI 10.3390/ijerph19031790, PubMed 35162813

Sunde T, Hummelen B, Himle JA, Walseth LT, Vogel PA, Launes G, Haaland VØ, Haaland ÅT (2022)
Correction to: Early maladaptive schemas impact on long-term outcome in patients treated with group behavioral therapy for obsessive-compulsive disorder
BMC Psychiatry, 22 (1), 291
DOI 10.1186/s12888-022-03776-8, PubMed 35459167

Zahl KE, Pedersen G, Eikenaes IU, Stänicke LI, Wilberg T, Baltzersen ÅL, Pettersen MS, Hummelen B, Arnevik E, Johansen MS, Hartveit Kvarstein E (2022)
Avoidant and borderline personality disorder patients during the first Covid-19 wave in Norway - a survey-based comparison of therapy changes and patients' accommodations
Nord J Psychiatry, 77 (4), 336-344
DOI 10.1080/08039488.2022.2110614, PubMed 35984379

Publications 2021

Eskeland SO, Moen E, Meland KJ, Andersen A, Hummelen B (2021)
Skin picking disorder
Tidsskr Nor Laegeforen, 141 (18)
DOI 10.4045/tidsskr.21.0128, PubMed 34911273

Hartveit Kvarstein E, Zahl KE, Stänicke LI, Pettersen MS, Baltzersen ÅL, Johansen MS, Eikenæs IU, Hummelen B, Wilberg T, Ajo Arnevik E, Pedersen G (2021)
Vulnerability of personality disorder during COVID-19 crises: a multicenter survey of mental and social distress among patients referred to treatment
Nord J Psychiatry
DOI 10.1080/08039488.2021.1942980, PubMed 34369842

Heltne A, Bode C, Hummelen B, Falkum E, Selvik SG, Paap MCS (2021)
Norwegian Clinicians' Experiences of Learnability and Usability of SCID-II, SCID-5-PD and SCID-5-AMPD-I Interviews: A Sequential Multi-Group Qualitative Approach
J Pers Assess, 104 (5), 599-612
DOI 10.1080/00223891.2021.1975726, PubMed 34546142

Kvarstein EH, Zahl KE, Stänicke LI, Pettersen MS, Baltzersen ÅL, Johansen MS, Eikenaes IU, Arnevik EA, Hummelen B, Wilberg T, Pedersen G (2021)
Vulnerability of personality disorder during the Covid-19 crises - a multicenter survey of treatment experiences among patients referred to treatment
Nord J Psychiatry, 76 (1), 52-63
DOI 10.1080/08039488.2021.1934110, PubMed 34126854

Paap MCS, Heltne A, Pedersen G, Germans Selvik S, Frans N, Wilberg T, Hummelen B (2021)
More is more: Evidence for the incremental value of the SCID-II/SCID-5-PD specific factors over and above a general personality disorder factor
Personal Disord, 13 (2), 108-118
DOI 10.1037/per0000426, PubMed 33600207

Ulberg R, Hummelen B, Hersoug AG, Midgley N, Høglend PA, Dahl HJ (2021)
The first experimental study of transference work-in teenagers (FEST-IT): a multicentre, observer- and patient-blind, randomised controlled component study
BMC Psychiatry, 21 (1), 106
DOI 10.1186/s12888-021-03055-y, PubMed 33596856

Publications 2020

Bøen E, Hummelen B, Boye B, Elvsåshagen T, Malt UF (2020)
Borderline patients have difficulties describing feelings; bipolar II patients describe difficult feelings. An alexithymia study
Acta Psychiatr Scand, 142 (3), 203-214
DOI 10.1111/acps.13204, PubMed 32594515

Eikeseth FF, Sætren SS, Benjamin BR, Ulltveit-Moe Eikenæs I, Sütterlin S, Hummelen B (2020)
The Test-Retest Reliability of Heart Rate Variability and Its Association With Personality Functioning
Front Psychiatry, 11, 558145
DOI 10.3389/fpsyt.2020.558145, PubMed 33329098

Hummelen B, Braeken J, Buer Christensen T, Nysaeter TE, Germans Selvik S, Walther K, Pedersen G, Eikenaes I, Paap MCS (2020)
A Psychometric Analysis of the Structured Clinical Interview for the DSM-5 Alternative Model for Personality Disorders Module I (SCID-5-AMPD-I): Level of Personality Functioning Scale
Assessment, 28 (5), 1320-1333
DOI 10.1177/1073191120967972, PubMed 33155489

Paap MCS, Hummelen B, Braeken J, Arnevik EA, Walderhaug E, Wilberg T, Berghuis H, Hutsebaut J, Pedersen G (2020)
A multi-center psychometric evaluation of the Severity Indices of Personality Problems 118 (SIPP-118): Do we really need all those facets?
Qual Life Res, 30 (2), 567-575
DOI 10.1007/s11136-020-02654-8, PubMed 33029679

Zimmermann J, Muller S, Bach B, Hutsebaut J, Hummelen B, Fischer F (2020)
A Common Metric for Self-Reported Severity of Personality Disorder
Psychopathology, 53 (3-4), 168-178
DOI 10.1159/000507377

Publications 2019

Arnevik EA, Pedersen G, Walderhaug E, Lien I, Wilberg T, Hummelen B (2019)
Measuring Personality Problems in Patients With Substance Use Disorders: A Cross-Sample Validation
J Dual Diagn, 15 (4), 324-332
DOI 10.1080/15504263.2019.1668583, PubMed 31571533

Buer Christensen T, Eikenaes I, Hummelen B, Pedersen G, Nysæter TE, Bender DS, Skodol AE, Selvik SG (2019)
Level of personality functioning as a predictor of psychosocial functioning-Concurrent validity of criterion A
Personal Disord, 11 (2), 79-90
DOI 10.1037/per0000352, PubMed 31580097

Buer Christensen T, Hummelen B, Paap MCS, Eikenaes I, Selvik SG, Kvarstein E, Pedersen G, Bender DS, Skodol AE, Nysæter TE (2019)
Evaluation of Diagnostic Thresholds for Criterion A in the Alternative DSM-5 Model for Personality Disorders
J Pers Disord, 34 (Supplement C), 40-61
DOI 10.1521/pedi_2019_33_455, PubMed 31682197

Bøen E, Hjørnevik T, Hummelen B, Elvsåshagen T, Moberget T, Holtedahl JE, Babovic A, Hol PK, Karterud S, Malt UF (2019)
Patterns of altered regional brain glucose metabolism in borderline personality disorder and bipolar II disorder
Acta Psychiatr Scand, 139 (3), 256-268
DOI 10.1111/acps.12997, PubMed 30552759

Pedersen G, Arnevik EA, Hummelen B, Walderhaug E, Wilberg T (2019)
Psychometric Properties of the Severity Indices of Personality Problems (SIPP) in Two Samples A Norwegian Community Sample and Clinical Samples of Patients With and Without Personality Disorders
Eur. J. Psychol. Assess., 35 (5), 698-711
DOI 10.1027/1015-5759/a000436

Sunde T, Hummelen B, Himle JA, Walseth LT, Vogel PA, Launes G, Haaland VØ, Haaland ÅT (2019)
Early maladaptive schemas impact on long-term outcome in patients treated with group behavioral therapy for obsessive-compulsive disorder
BMC Psychiatry, 19 (1), 318
DOI 10.1186/s12888-019-2285-2, PubMed 31655556

Sönmez N, Romm KL, Østefjells T, Grande M, Jensen LH, Hummelen B, Tesli M, Melle I, Røssberg JI (2019)
Cognitive behavior therapy in early psychosis with a focus on depression and low self-esteem: A randomized controlled trial
Compr Psychiatry, 97, 152157
DOI 10.1016/j.comppsych.2019.152157, PubMed 31935529

Publications 2018

Buer Christensen T, Paap MCS, Arnesen M, Koritzinsky K, Nysaeter TE, Eikenaes I, Germans Selvik S, Walther K, Torgersen S, Bender DS, Skodol AE, Kvarstein E, Pedersen G, Hummelen B (2018)
Interrater Reliability of the Structured Clinical Interview for the DSM-5 Alternative Model of Personality Disorders Module i: Level of Personality Functioning Scale
J Pers Assess, 100 (6), 630-641
DOI 10.1080/00223891.2018.1483377, PubMed 30084661

Eskeland SO, Moen E, Hummelen B (2018)
[Trichotillomania]
Tidsskr Nor Laegeforen, 138 (10)
DOI 10.4045/tidsskr.17.0599, PubMed 29893105

Kvarstein EH, Pedersen G, Folmo E, Urnes Ø, Johansen MS, Hummelen B, Wilberg T, Karterud S (2018)
Mentalization-based treatment or psychodynamic treatment programmes for patients with borderline personality disorder - the impact of clinical severity
Psychol Psychother, 92 (1), 91-111
DOI 10.1111/papt.12179, PubMed 29582581

Pedersen G, Urnes Ø, Hummelen B, Wilberg T, Kvarstein EH (2018)
Revised manual for the Global Assessment of Functioning scale
Eur Psychiatry, 51, 16-19
DOI 10.1016/j.eurpsy.2017.12.028, PubMed 29510296

Selvik SG, Hummelen B, Romild U, Langbehn DR, Pedersen G (2018)
The Iowa Personality Disorder Screen: A validation study in a psychiatric population that receives long-term group psychotherapy for personality related problems
Personal Ment Health, 12 (3), 229-240
DOI 10.1002/pmh.1418, PubMed 29722177

Publications 2017

Haaland AT, Eskeland SO, Moen EM, Vogel PA, Haseth S, Mellingen K, Himle JA, Woods DW, Hummelen B (2017)
ACT-enhanced behavior therapy in group format for Trichotillomania: An effectiveness study
J. Obsessive-Compuls. Relat. Disord., 12, 109-116
DOI 10.1016/j.jocrd.2017.01.005

Paap MCS, Braeken J, Pedersen G, Urnes Ø, Karterud S, Wilberg T, Hummelen B (2017)
A Psychometric Evaluation of the DSM-IV Criteria for Antisocial Personality Disorder: Dimensionality, Local Reliability, and Differential Item Functioning Across Gender
Assessment, 27 (1), 89-101
DOI 10.1177/1073191117745126, PubMed 29284276

Publications 2016

Selvik SG, Kristiansen O, Hummelen B, Solhaug HI (2016)
[A shortcut in the diagnosis of personality disorders?]
Tidsskr Nor Laegeforen, 136 (7), 596
DOI 10.4045/tidsskr.16.0148, PubMed 27094658

Publications 2015

Antonsen BT, Kvarstein EH, Urnes Ø, Hummelen B, Karterud S, Wilberg T (2015)
Favourable outcome of long-term combined psychotherapy for patients with borderline personality disorder: Six-year follow-up of a randomized study
Psychother Res, 27 (1), 51-63
DOI 10.1080/10503307.2015.1072283, PubMed 26261865

Eikenaes I, Egeland J, Hummelen B, Wilberg T (2015)
Avoidant personality disorder versus social phobia: the significance of childhood neglect
PLoS One, 10 (3), e0122846
DOI 10.1371/journal.pone.0122846, PubMed 25815817

Eikenaes I, Egeland J, Hummelen B, Wilberg T (2015)
Correction: Avoidant Personality Disorder versus Social Phobia: The Significance of Childhood Neglect
PLoS One, 10 (5), e0128737
DOI 10.1371/journal.pone.0128737, PubMed 25978045

Publications 2014

Antonsen BT, Klungsøyr O, Kamps A, Hummelen B, Johansen MS, Pedersen G, Urnes O, Kvarstein EH, Karterud S, Wilberg T (2014)
Step-down versus outpatient psychotherapeutic treatment for personality disorders: 6-year follow-up of the Ullevål personality project
BMC Psychiatry, 14, 119
DOI 10.1186/1471-244X-14-119, PubMed 24758722

Bøen E, Hummelen B, Elvsåshagen T, Boye B, Andersson S, Karterud S, Malt UF (2014)
Different impulsivity profiles in borderline personality disorder and bipolar II disorder
J Affect Disord, 170, 104-11
DOI 10.1016/j.jad.2014.08.033, PubMed 25237733

Bøen E, Westlye LT, Elvsåshagen T, Hummelen B, Hol PK, Boye B, Andersson S, Karterud S, Malt UF (2014)
Smaller stress-sensitive hippocampal subfields in women with borderline personality disorder without posttraumatic stress disorder
J Psychiatry Neurosci, 39 (2), 127-34
DOI 10.1503/jpn.130070, PubMed 24309162

Hummelen B, Pedersen G, Wilberg T, Karterud S (2014)
Poor Validity of the DSM-IV Schizoid Personality Disorder Construct as a Diagnostic Category
J Pers Disord, 29 (3), 334-46
DOI 10.1521/pedi_2014_28_159, PubMed 25248009

Kvarstein EH, Pedersen G, Urnes Ø, Hummelen B, Wilberg T, Karterud S (2014)
Changing from a traditional psychodynamic treatment programme to mentalization-based treatment for patients with borderline personality disorder--does it make a difference?
Psychol Psychother, 88 (1), 71-86
DOI 10.1111/papt.12036, PubMed 25045028

Publications 2013

Bøen E, Westlye LT, Elvsåshagen T, Hummelen B, Hol PK, Boye B, Andersson S, Karterud S, Malt UF (2013)
Regional cortical thinning may be a biological marker for borderline personality disorder
Acta Psychiatr Scand, 130 (3), 193-204
DOI 10.1111/acps.12234, PubMed 24571788

Eikenaes I, Hummelen B, Abrahamsen G, Andrea H, Wilberg T (2013)
Personality functioning in patients with avoidant personality disorder and social phobia
J Pers Disord, 27 (6), 746-63
DOI 10.1521/pedi_2013_27_109, PubMed 23786266

Pedersen G, Karterud S, Hummelen B, Wilberg T (2013)
The impact of extended longitudinal observation on the assessment of personality disorders
Personal Ment Health, 7 (4), 277-87
DOI 10.1002/pmh.1234, PubMed 24343977

Reas DL, Rø Ø, Karterud S, Hummelen B, Pedersen G (2013)
Eating disorders in a large clinical sample of men and women with personality disorders
Int J Eat Disord, 46 (8), 801-9
DOI 10.1002/eat.22176, PubMed 23983043

Publications 2011

Hummelen B, Pedersen G, Karterud S (2011)
Some suggestions for the DSM-5 schizotypal personality disorder construct
Compr Psychiatry, 53 (4), 341-9
DOI 10.1016/j.comppsych.2011.05.009, PubMed 21741634

Publications 2010

Hummelen B (2010)
Treatment of borderline personality disorder with schizotypal traits by Cesare Maffei, MD
Personal. Ment. Health, 4 (3), 229-232
DOI 10.1002/pmh.135

Publications 2008

Hummelen B, Wilberg T, Pedersen G, Karterud S (2008)
The quality of the DSM-IV obsessive-compulsive personality disorder construct as a prototype category
J Nerv Ment Dis, 196 (6), 446-55
DOI 10.1097/NMD.0b013e3181775a4e, PubMed 18552621

Wilberg T, Hummelen B, Pedersen G, Karterud S (2008)
A study of patients with personality disorder not otherwise specified
Compr Psychiatry, 49 (5), 460-8
DOI 10.1016/j.comppsych.2007.12.008, PubMed 18702931

Publications 2007

Hummelen B, Wilberg T, Karterud S (2007)
Interviews of female patients with borderline personality disorder who dropped out of group psychotherapy
Int J Group Psychother, 57 (1), 67-91
DOI 10.1521/ijgp.2007.57.1.67, PubMed 17266430

Hummelen B, Wilberg T, Pedersen G, Karterud S (2007)
The relationship between avoidant personality disorder and social phobia
Compr Psychiatry, 48 (4), 348-56
DOI 10.1016/j.comppsych.2007.03.004, PubMed 17560956

Publications 2006

Hummelen B, Wilberg T, Pedersen G, Karterud S (2006)
An investigation of the validity of the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition avoidant personality disorder construct as a prototype category and the psychometric properties of the diagnostic criteria
Compr Psychiatry, 47 (5), 376-83
DOI 10.1016/j.comppsych.2006.01.006, PubMed 16905400