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  • E-mailAasa.Hammar@uib.no
  • Phone+47 55 58 62 12+47 971 67 225
  • Visitor Address
    Jonas Lies vei 91
  • Postal Address
    Postboks 7807
    5020 BERGEN

Longitudinal studies in Major Depressive Disorder (MDD), cognitive functioning and cortisol profiles.

Hammar is head of the node Bergen Mood and Cognitive Function Group (MCF) with several doctoral candidates been working with issues dealing with major depression, cognitive functioning and longitudinal studies. Data collection has been conducted in three large main studies and Hammar is the principal investigator for all projects included in these studies.  

All investigations include a comprehensive neuropsychological test battery, consisting of both experimental and standardized tests, cortisol measurements with dexamethasone, self-reports concerning cognitive functioning, quality of life, working capacity, coping strategies, ruminative style and dysfunctional attitudes. Some patients have been investigated with fMRI.

The first study is a literature of the longest follow-up studies within a group of patients who suffer from recurrent depression and examining cognitive functioning over a 10 year period.

The other main project is a longitudinal study that included patients with recurrent depression.

The third major project is one of the first worldwide to collect a patient group of first episode depressed patients and follow them over time.

Several findings are generated from these data and materials published in international journals (see publication list).

Another major project is currently collecting data from patients in remission.

Further, we are currently conducting a 5-year follow-up on the first episode patient group.

Hammar is also a partner in various projects that examine children with autism, patients with anxiety, bipolar patients receiving ECT treatment, biological markers in adolescents who survived the Utøya massacre.

 

 

 

 

 

 

Since 1997 I have been a lecturer at the Professional studies in Psychology at UiB, including both biological psychology and neuropsychological courses (including master’s and bachelor’s level), as well as several other teaching activities. I have also been lecturing in psychological courses for the Master’s training in Logopedy at UiB between 2001-2010.000

 

 

 

 

 

 

 

 

 

                                                                                         

Journal articles
  • Brus, Ole; Nordanskog, Pia; Båve, Ullvi; Cao, Yang; Hammar, Åsa; Landén, Mikael; Lundberg, Johan; Nordenskjöld, Axel. 2017. Subjective memory immediately following electroconvulsive therapy. Journal of ECT. 33: 96-103. doi: 10.1097/YCT.0000000000000377
  • Porter, Richard J; Hammar, Åsa; Beevers, Christopher G; Bowie, Christopher R.; Nodtvedt, Øystein O; Peckham, Andrew D; Siegle, Greg J; Tharp, Jordan A; Ueland, Torill; Vinogradov, Sophia; Johnson, Sheri L. 2017. Cognitive and affective remediation training for mood disorders. Australian and New Zealand journal of psychiatry (Print). 51: 317-319. doi: 10.1177/0004867416678079
  • Hammar, Åsa; Neto, Emanuel; Clemo, Leila; Hjetland, Gunnhild Johnsen; Hugdahl, Kenneth; Elliott, Rebecca. 2016. Striatal hypoactivation and cognitive slowing in patients with partially remitted and remitted major depression. PsyCh Journal. 5: 191-205. doi: 10.1002/pchj.134
  • Brix, Maiken Kirkegaard; Ersland, Lars; Hugdahl, Kenneth; Grüner, Renate; Posserud, Maj-Britt Rocio; Hammar, Åsa; Craig-Craven, Alexander Richard; Noeske, Ralph; Evans, C. John; Walker, Hanne Bjørg Hansen; Midtvedt, Tore; Beyer, Mona K. 2015. Brain MR spectroscopy in autism spectrum disorder—the GABA excitatory/inhibitory imbalance theory revisited. Frontiers in Human Neuroscience. 9: 1-12. doi: 10.3389/fnhum.2015.00365
  • Hansson, Pia Berner; Murison, Robert; Lund, Anders; Hammar, Åsa. 2015. Cognitive functioning and cortisol profiles in first episode major depression. Scandinavian Journal of Psychology. 56: 379-383. doi: 10.1111/sjop.12230
  • Oltedal, Leif; Kessler, Ute; Ersland, Lars; Grüner, Renate; Andreassen, Ole Andreas; Haavik, Jan; Hoff, Per Ivar; Hammar, Åsa; Dale, Anders Martin; Hugdahl, Kenneth; Ødegaard, Ketil Joachim. 2015. Effects of ECT in treatment of depression: Study protocol for a prospective neuroradiological study of acute and longitudinal effects on brain structure and function. BMC Psychiatry. 15:94. 10 pages. doi: 10.1186/s12888-015-0477-y
  • Gjerde, Priyanthi Borgen; Schmid, Marit Therese; Hammar, Åsa; Wester, Knut. 2013. Intracranial arachnoid cysts: impairment of higher cognitive functions and postoperative improvement. Journal of Neurodevelopmental Disorders. 5. 10 pages. doi: 10.1186/1866-1955-5-21
  • Hammar, Åsa; Schmid, Marit Therese. 2013. Visual memory performance in patients with major depression: a 9-month follow-up. Applied neuropsychology. 20: 192-196. doi: 10.1080/09084282.2012.670170
  • Hammar, Åsa; Årdal, Guro. 2013. Verbal memory functioning in recurrent depression during partial remission and remission. Frontiers in Psychology. 4. doi: 10.3389/fpsyg.2013.00652
  • Hansson, Pia Berner; Murison, Robert; Lund, Anders; Hammar, Åsa. 2013. Cognitive functioning and cortisol suppression in recurrent major depression. PsyCh Journal. 2: 167-174. doi: 10.1002/pchj.29
  • Hovland, Anders; Pallesen, Ståle; Hammar, Åsa; Hansen, Anita Lill; Thayer, Julian Francis; Sivertsen, Børge; Tarvainen, Mika P.; Nordhus, Inger Hilde. 2013. Subjective sleep quality in relation to inhibition and heart rate variability in patients with panic disorder. Journal of Affective Disorders. 150: 152-155. doi: 10.1016/j.jad.2012.12.017
  • Kessler, Ute; Schøyen, Helle Kristine; Andreassen, Ole Andreas; Eide, Geir Egil; Hammar, Åsa; Malt, Ulrik Fredrik; Ødegaard, Ketil Joachim; Morken, Gunnar; Sundet, Kjetil Søren; Vaaler, Arne Einar. 2013. Neurocognitive profiles in treatment-resistant bipolar I and bipolar II disorder depression. BMC Psychiatry. 13. doi: 10.1186/1471-244X-13-105
  • Schmid, Marit Therese; Hammar, Åsa. 2013. Cognitive function in first episode major depressive disorder: Poor inhibition and semantic fluency performance. Cognitive Neuropsychiatry. 18: 515-530. doi: 10.1080/13546805.2012.754748
  • Schmid, Marit Therese; Hammar, Åsa. 2013. A follow-up study of first episode major depressive disorder. Impairment in inhibition and semantic fluency – potential predictors for relapse? Frontiers in Psychology. 4. doi: 10.3389/fpsyg.2013.00633
  • Strand, Mari; Oram, Mike W.; Hammar, Åsa. 2013. Emotional information processing in major depression remission and partial remission: faces come first. Applied neuropsychology. 20: 110-119. doi: 10.1080/09084282.2012.670159
  • Strand, Mari; Sætrevik, Bjørn; Lund, Anders; Hammar, Åsa. 2013. The relationship between residual symptoms of depression and emotional information processing. Nordic Journal of Psychiatry. 67: 233-239. doi: 10.3109/08039488.2012.711857
  • Årdal, Guro; Lund, Anders; Hammar, Åsa. 2013. Health-related quality of life in recurrent major depressive disorder-A 10-year follow-up study. Nordic Journal of Psychiatry. 67: 339-343. doi: 10.3109/08039488.2012.746730
  • Hammar, Åsa; Kildal, Anna; Schmid, Marit Therese. 2012. Information processing in patients with first episode major depression. Scandinavian Journal of Psychology. 53: 445-449. doi: 10.1111/sjop.12012
  • Hammar, Åsa; Kildal, Anna; Schmid, Marit Therese. 2012. Information processing in first episode depression. Scandinavian Journal of Psychology. 53: 445-449. doi: 10.1111/sjop.12012
  • Hammar, Åsa; Årdal, Guro. 2012. Effortful information processing in patients with major depression - A 10-year follow-up study. Psychiatry Research. 198: 420-423. doi: 10.1016/j.psychres.2011.11.020
  • Hovland, Anders; Pallesen, Ståle; Hammar, Åsa; Hansen, Anita Lill; Thayer, Julian Francis; Tarvainen, Mika P.; Nordhus, Inger Hilde. 2012. The relationships among heart rate variability, executive functions, and clinical variables in patients with panic disorder. International Journal of Psychophysiology. 86: 269-275. doi: 10.1016/j.ijpsycho.2012.10.004
  • Kessler, Ute; Schøyen, Helle Kristine; Andreassen, Ole Andreas; Bergsholm, Per; Eide, Geir Egil; Hammar, Åsa; Malt, Ulrik Fredrik; Ødegaard, Ketil Joachim; Morken, Gunnar; Sundet, Kjetil Søren; Vaaler, Arne. 2012. The neurocognitive profile in depressed therapy resistant bipolar disorder inpatients. Bipolar Disorders. 14: 91-91.
  • Hammar, Åsa; Isaksen, Lise Widding; Schmid, Marit Therese; Årdal, Guro; Strand, Mari. 2011. Patients with major depression show intact memory performance- given optimal conditions. Applied neuropsychology. 18: 191-196. doi: 10.1080/09084282.2011.595445
  • Hammar, Åsa; Strand, Mari; Årdal, Guro; Schmid, Marit Therese; Lund, Anders; Elliott, Rebecca. 2011. Testing the cognitive effort hypothesis of cognitive impairment in major depression. Nordic Journal of Psychiatry. 65: 74-80. doi: 10.3109/08039488.2010.494311
  • Schmid, Marit Therese; Strand, Mari; Årdal, Guro; Lund, Anders; Hammar, Åsa. 2011. Prolonged Impairment in Inhibition and Semantic Fluency in a Follow-up Study of Recurrent Major Depression. Archives of clinical neuropsychology. 26: 677-686. doi: 10.1093/arclin/acr048
  • Årdal, Guro; Hammar, Åsa. 2011. Is impairment in cognitive inhibition in the acute phase of major depression irreversible? Results from a 10-year follow-up study. Psychology and Psychotherapy: Theory, Research and Practice. 84: 141-150. doi: 10.1348/147608310X502328
  • Eichele, Heike; Eichele, Tom; Hammar, Åsa; Freyberger, Harald J.; Hugdahl, Kenneth; Plessen, Kerstin J. 2010. Go/NoGo performance in boys with Tourette Syndrome. Child Neuropsychology. 16: 162-168. doi: 10.1080/09297040903150182
  • Hammar, Åsa; Sørensen, Lin; Årdal, Guro; Ødegaard, Ketil Joachim; Kroken, Rune; Roness, Atle; Lund, Anders. 2010. Enduring cognitive dysfunction in unipolar major depression: A test-retest study using the Stroop paradigm. Scandinavian Journal of Psychology. 51: 304-308. doi: 10.1111/j.1467-9450.2009.00765.x
  • Hammar, Åsa; Årdal, Guro. 2009. Cognitive functioning in major depression - a summary. Frontiers in Human Neuroscience. 3. 7 pages. doi: 10.3389/neuro.09.026.2009
  • Hugdahl, Kenneth; Specht, Karsten; Biringer, Eva Aaker; Weis, Susanne; Elliott, Rebecca; Hammar, Åsa; Ersland, Lars; Lund, Anders. 2007. Increased parietal and frontal activation after remission from recurrent major depression: A repeated fMRI study. Cognitive Therapy and Research. 31: 147-160. doi: 10.1007/s10608-006-9116-8
  • Plessen, Kerstin J.; Lundervold, Arvid; Grüner, Renate; Hammar, Åsa; Lundervold, Astri Johansen; Peterson, Bradley Scott; Hugdahl, Kenneth. 2007. Functional brain asymmetry, attentional modulation, and interhemispheric transfer in boys with Tourette syndrome. Neuropsychologia. 45: 767-774. doi: 10.1016/j.neuropsychologia.2006.08.006
  • Hammar, Åsa. 2006. Et longitudinelt forskningsprosjekt vedrørende alvorlig depresjon og kognitive funksjoner ved Universitetet i Bergen. Nevropsykologi : Medlemsblad for Norsk Nevropsykologisk Forening. 9: 47-49.
  • Plessen, Kerstin Von; Grüner, Renate; Lundervold, Arvid; Hirsch, Jochen G.; Xu, Dongrong; Bansal, Ravi; Hammar, Åsa; Lundervold, Astri Johansen; Wentzel-Larsen, Tore; Lie, Stein Atle; Gass, Achim; Peterson, Bradley Scott; Hugdahl, Kenneth. 2006. Reduced white matter connectivity in the Corpus Callosum of children with Tourette syndrome. Journal of Child Psychology and Psychiatry and Allied Disciplines. 47: 1013-1022. doi: 10.1111/j.1469-7610.2006.01639.x
  • Stordal, Kirsten Irene; Lundervold, Astri Johansen; Mykletun, Arnstein; Asbjørnsen, Arve Egil; Biringer, Eva Aaker; Hammar, Aasa; Hammar, Åsa; Landrø, Nils Inge; Roness, Atle; Rund, Bjørn Rishovd; Sundet, Kjetil; Egeland, Jens; Lund, Anders. 2005. Frequency and characteristics of recurrent major depressed patients with inimpaired executive functions. World Journal of Biological Psychiatry. 6: 36-44.
  • Thomsen, Tormod; Specht, Karsten; Hammar, Åsa; Nyttingnes, Jarle; Ersland, Lars; Hugdahl, Kenneth. 2004. Brain localization of attentional control in different age groups by combining functional and structural MRI. NeuroImage. 22: 912-919.
  • Hammar, Åsa. 2003. Automatic and effortful information processing in unipolar major depression. Scandinavian Journal of Psychology. 44: 409-413.
  • Hammar, Åsa. 2003. Major depression and cognitive dysfunction. An experimental study of the cognitive effort hypothesis. Presentasjon av sammendrag av doktorgradsavhandling. Nevropsykologi : Medlemsblad for Norsk Nevropsykologisk Forening. 6: 18-19.
  • Hammar, Åsa; Lund, Anders; Hugdahl, Kenneth. 2003. Long-lasting cognitive impairment in unipolar major depression. A 6 month follow-up study. Psychiatry Research. 118: 189-196.
  • Hammar, Åsa; Lund, Anders; Hugdahl, Kenneth. 2003. Selective impairment in effortful information processing in major depression. Journal of the International Neuropsychological Society. 9: 954-959.
  • Hammar, Åsa. 2002. Kvinner oftest deprimert. Bergens Tidende. Published 2002-08-31.
  • Hammar, Åsa. 2002. Beskrivelse av et undervisningsopplegg for skrivetreningsseminar. UPED-skrift. 2.
  • Svebak, S.; Søndenaa, K.; Hausken, Trygve; Søreide, O.; Hammar, Åsa; Berstad, A. 2000. The significance of personality in pain from gallbladder stones. Scandinavian Journal of Gastroenterology. 7: 759-764.
  • Svebak, Sven; Søndenaa, Karl; Hausken, Trygve; Søreide, Odd; Hammar, Åsa; Berstad, Arnold. 2000. The significance of personality in pain from gallbladder stone. Scandinavian Journal of Gastroenterology. 35: 759-764.
Reports and theses
  • Hammar, Åsa. 2003. Major depression and cognitive dysfunction - An experimental study of the cognitive effort hypothesis (doktorgradsavhandling).

More information in national current research information system (CRIStin)

 

 

ACADEMIC DEGREE 

2006                Specialist in Clinical Neuropsychology (NPF)

2003                PhD/Dr. psychol, Faculty of Psychology, University of Bergen, Norway. Title of thesis: Major depression and cognitive dysfunction- An experimental study of the cognitive effort hypothesis. Supervisor: Professor Kenneth Hugdahl.
 

1996                Cand. psychol, Faculty of Psychology, University of Bergen (UiB), Norway 

 

ACADEMIC AND SCIENTIFIC POSITIONS 

2012 -              Professor in Clinical neuropsychology, Department of Biological and Medical Psychology (IMBP), UiB, Norway

2003-               20% Clinical position at The Division of Psychiatry, Haukeland University Hospital

2003-2012       Associate professor in Clinical neuropsychology, IMBP, UiB, Norway

2002                Assistant professor, Section for Clinical Neuropsychology, IMBP, UiB, Norway

1998-1999       Specialpsychologist, Section for Rehabilitation, Neurological Division, Haukeland University Hospital

1993-1996       50% Research assistant, IMBP, UiB, Norway

INSTITUTIONAL RESPONSIBILITIES

2013-2017       Faculty board member, Faculty of Psychology, UiB, Norway

2013–present   Head of Clinic, Neuropsychological Polyclinic, UiB, Norway

2011-present     Board Member, MoodNet, Regional Research Network on Mood Disorders, Helse Vest, Norway

2008-2009       Head of Clinic, Neuropsychological Polyclinic, UIB, Norway

2006-2008       Faculty board member, Faculty of Psychology, UiB, Norway

2006-2007       Head of department, IMBP, UiB, Norway

1999-2006       Member of the Faculty Committee for Research and PhD training, Faculty of Psychology, UiB, Norway

 

 

 

 

 

Project Title

Funding source

Amount

(Euros)

Period

PI

Cognitive function and emotional information processing in recurrent MDD- PhD- project 

The National Program for Integrated Clinical Specialist and PhD-training for Psychologists, Norway

400 000

2004-2012

Hammar

Major depression, cognitive function and cortisol- including PhD project

Research Council of Norway

400 000

2006-2013

Hammar

fMRI study Depression and function

Helse Vest, Mood Net, Norway

8 670

2009

Hammar

Cognitive function and emotional information processing in first episode MDD

Helse Vest, Mood Net, Norway

48 500

2011

Hammar

Cognitive function in recurrent MDD- a 8-10 year follow up

Faculty of Psychology, University of Bergen

8 000

2008

Hammar

Cognitive functioning in first episode MDD patients- a five year follow-up

Helse Vest, MoodNet

53 300

2014-2014

Hammar

The neurocognitive profile in remitted MDD patients

Helse Vest, Mood Net, Strategic funds

 

46 700

2012-2014

Hammar

Longitudinal studies of major Depression Disorder and cognitive functioning and emotional information processing: predictors for relapse?- PhD project

Research Council of Norway

400 000

2008-2015

Hammar