Cognitive Dysfunction in Depression
A large body of evidence confirms that patients suffering from unipolar depression exhibit amnestic, attentional, and executive deficits (e.g., Moritz et al., 2001, 2002), which are largely secondary to poor test motivation and test anxiety (Moritz et al., 2017). To illustrate our work, some of the results of our current studies are summarized here. More findings may be found in the publications listed below.
In one study, we administered an emotional variant of the Deese-Roediger-McDermott paradigm. It was confirmed that relative to controls, patients with major depression memorize emotional material more efficiently than neutral material (Moritz et al., 2005). An interesting novel finding was that emotional distractors (i.e., words not presented during encoding but shown at recognition), particularly depressive items, were significantly more often falsely recognized by depressive patients (i.e., more false alarm) relative to controls. This is the first evidence that memory structures in depressed people not only incorporate depressive information more easily but are also more susceptible to negatively-valenced intrusions. This could represent an important pathogenic mechanism of the disorder. In a further study (Moritz et al., 2008), depressed patients displayed a mood-congruency memory (MCM) bias (i.e., better recollection of depression-relevant material) only if items were appraised as more salient (i.e., personally relevant). We claim that personal salience but not valence is the key determinant of the MCM bias in depression (diploma thesis Kirsten Riedesel in cooperation with Marina G. Arzola, Stanford). In a further study by our team (Wittekind et al., 2014), we were able to provide additional evidence regarding the importance of valence and salience for false memories in depression.
In addition to memory, we investigated the ability of women suffering from depression to identify standard (emotional) facial expressions. In this study, we compared both the error rate of women with and without depression and their confidence regarding the identification of emotions. Analyses showed that depressed women had worse performance for the emotion “disgust”. Moreover, women suffering from depression showed more confidence in false answers than healthy controls (see Fieker et al., 2016).
In cooperation with Prof. Christian Otte and his colleagues, we are investigating the therapeutic role of the mineralocorticoid receptor on cognition and the association between cognition and cortisol, as well as the association between testosterone and memory deficits in depression (Dettenborn et al., 2013, Hinkelmann et al., 2009; Hinkelmann et al., 2012a; Hinkelmann et al., 2012b; Hinkelmann et al., 2013; Otte et al., 2010). Among other things, we have found that cognitive deficits in depression are associated with increased cortisol levels, whereas improvement in some cognitive domains is more associated with decreasing cortisol secretion than with improved mood.
In addition to answering basic research questions, we would like to identify ways to improve the treatment of depression. We aim to incorporate research findings into new treatment concepts and would also like to improve the dissemination of existing therapies. Over the past years, we have developed a metacognitive training for depression (D-MCT) that applies basic research findings in a clinical context. Moreover, we have evaluated self-help treatments as well as online interventions (see the next section).
Psychological Online Interventions
Although a significant amount of scientific evidence has confirmed the efficacy of various therapies for depression, only about 50% of the people suffering from depression receive an empirically-based therapy for depression. This treatment gap is caused by a lack of health care resources (e.g., long waiting times caused by a lack of therapists), as well as by patient-related treatment barriers. In a study by our team, we found that, among other factors, fears of a poor therapeutic relationship, general skepticism about psychotherapy, and fear of stigma were prominent treatment barriers (Moritz et al., 2013). In patients with depressive symptoms associated with neurological disorders, there are additional physical or transport-related treatment barriers.
Due to this large treatment gap, we are evaluating low-threshold treatment approaches, such as psychological online interventions. Research trials of such programs conducted by our working group revealed small-to-medium effect sizes in patients with a primary diagnosis of depression (Moritz et al., 2012), small effect sizes in patients with epilepsy and comorbid depression (Schröder et al., 2014), and medium effect sizes in patients with multiple sclerosis and comorbid depression (Fischer et al., 2015).
Furthermore, our group was part of the multicenter EVIDENT-project that was designed to examine the efficacy of the online intervention “deprexis” in over 1,000 people with symptoms of depression over a 3-year period (please find below a list of publications resulting from our cooperation in the EVIDENT study).
- Prof. Dr. Steffen Moritz
- Prof. Dr. Lena Jelinek
- Dipl.-Psych. Martina Fieker
- PD Dr. Sönke Arlt (Klinik für Psychiatrie und Psychotherapie, Hamburg)
- PD Dr. Kim Hinkelmann (Abteilung für Psychiatrie und Psychotherapie, Charité, Berlin)
- Dr. med. Holger Jahn (Klinik für Psychiatrie und Psychotherapie, Hamburg)
- PD Dr. Philipp Klein (Universität Lübeck)
- Prof. Dr. Christian Otte (Abteilung für Psychiatrie und Psychotherapie, Charité, Berlin)
- Dr. Johanna Schröder (Klinik für Psychiatrie und Psychotherapie, Hamburg)
Dettenborn, L., Hinkelmann, K., Muhtz, C., Gao, W., Wingenfeld, K., Spitzer, C., . . . & Otte, C. (2013). Hair testosterone and visuospatial memory in middle-aged men and women with and without depressive symptoms. Psychoneuroendocrinology, 38, 2373-2377.
Fieker, M., Moritz, S., Köther, U. & Jelinek, L. (2016). Emotion recognition in depression: An investigation of performance and response confidence in adult female patients with depression. Psychiatry Research, 242, 226-232.
Fischer, A., Schröder, J., Vettorazzi, E., Wolf, O., Pöttgen, J., Lau, S., Heesen, C., Moritz, S. & Gold, S. (2015). An online programme to reduce depression in patients with multiple sclerosis: a randomised controlled trial. The Lancet Psychiatry, 2, 217-223.
Hinkelmann, K., Moritz, S., Botzenhardt, J., Muhtz, C., Wiedemann, K., Kellner, M. & Otte, C. (2012a). Changes in cortisol secretion during antidepressive treatment and cognitive improvement in patients with major depression: A longitudinal study. Psychoneuroendocrinology, 37, 685-692.
Hinkelmann, K., Moritz, S., Botzenhardt, J., Riedesel, K., Wiedemann, K., Kellner, M. & Otte, C. (2009). Cognitive impairment in major depression: Association with salivary cortisol. Biological Psychiatry, 66, 879-885.
Hinkelmann, K., Moritz, S., Botzenhardt, J., Riedesel, K., Wiedemann, K., Kellner, M. & Otte, C. (2012b). Cognitive changes in cortisol secretion during antidepressive treatment and cognitive improvement in patients with major depression: A longitudinal study. Psychoneuroendocrinology, 37, 685-692.
Hinkelmann, K., Muhtz, C., Dettenborn, L., Agorastos, A., Moritz, S., Wingenfeld, K., . . . & Otte, C. (2013). Association between cortisol awakening response and memory function in major depression. Psychological Medicine, 43, 2255-2263.
Jelinek, L., Otte, C., Arlt, S. & Hauschildt, M. (2013). Denkverzerrungen erkennen und korrigieren: Eine Machbarkeitsstudie zum Metakognitiven Training bei Depressionen (D-MKT). Zeitschrift Für Psychiatrie, Psychologie & Psychotherapie, 61, 1–8.
Moritz, S., Birkner, C., Kloss, M., Jacobsen, D., Fricke, S., Böthern, A. & Hand, I. (2001). Impact of comorbid depressive symptoms on neuropsychological performance in obsessive-compulsive disorder. Journal of Abnormal Psychology, 110, 653-657.
Moritz, S., Gläscher, J. & Brassen, S. (2005). Investigation of mood-congruent false and true memory recognition in depression. Depression & Anxiety, 21, 9-17.
Moritz, S. & Graf, P. (2006). Performance of depressive and healthy participants on an affective priming task using word pronunciation. German Journal of Psychiatry, 9, 1-9.
Moritz, S., Kloss, M., Jahn, H., Hand, I., Haasen, C. & Krausz, M. (2002). Executive functioning in obsessive-compulsive disorder, unipolar depression and schizophrenia. Archives of Clinical Neuropsychology, 17, 477-483.
Moritz, S., Schilling, L., Hauschildt, M., Schröder, J. & Treszl, A. (2012). A randomized controlled trial of Internet-based therapy in depression. Behaviour Research & Therapy, 50, 513-521.
Moritz, S., Schröder, J., Meyer, B. & Hauschildt, M. (2013). The more it is needed, the less it is wanted: Attitudes toward face-to-face intervention among depressed patients undergoing online treatment. Depression & Anxiety, 30, 157-167.
Moritz, S., Stöckert, K., Hauschildt, M., Lill, H., Jelinek, L., Beblo, T., Dietrich, S. & Arlt, S. (2017). Are we exaggerating neuropsychological impairment in depression? Reopening a closed chapter. Expert Review of Neurotherapeutics, 17, 839-846.
Moritz, S., Voigt, K., Arzola, G. M. & Otte, C. (2008). When the half-full glass is appraised as half empty and memorised as completely empty: Mood-congruent true and false recognition in depression is modulated by salience. Memory, 16, 810-820.
Otte, C., Hinkelmann, K., Moritz, S., Yassouridis, A., Jahn, H., Wiedemann, K. & Kellner, M. (2010). Modulation of the mineralocorticoid receptor as add-on treatment in depression: A randomized, double-blind, placebo-controlled proof-of-concept study. Journal of Psychiatric Research, 44, 339-346.
Schröder, J. (2014). Psychotherapeuten und psychologische Online-Interventionen. [Psychotherapists and psychological online-interventions.] Psychotherapie Aktuell, 6, 33–36.
Schröder, J., Brückner, K., Fischer, A., Lindenau, M., Köther, U., Vettorazzi & Moritz, S. (2014). Efficacy of a psychological online intervention program for depression in people with epilepsy: A randomized controlled trial. Epilepsia, 55, 2069-76.
Wittekind, C. E., Terfehr, K., Otte, C., Jelinek, L., Hinkelmann, K. & Moritz, S. (2014). Mood-congruent memory in depression - The influence of personal relevance and emotional context. Psychiatry Research, 215, 606-613.
Schröder, J., Berger, T., Meyer, B., Lutz, W., Späth, C., Michel, P., Rose, M, Hautzinger, M., Hohagen, F., Klein, J. P. & Moritz, S. (2018). Impact and change of attitudes toward Internet interventions within a randomized controlled trial on individuals with depression symptoms. Depression & Anxiety, 35, 421-430.
Schneider, B. C., Schröder, J., Berger, T., Hohagen, F., Meyer, B., Späth, C., Greiner, W., Hautzinger, M., Lutz, W., Rose, M., Moritz, S. & Klein, J. P. (2018). Bridging the digital divide: A comparison of use and effectiveness of an online intervention for depression between digital immigrants and digital natives. Journal of Affective Disorders, 236, 243-251.
Fuhr, K.*, Schröder, J.*, Berger, T., Moritz, S., Meyer, B., Lutz, W., Hohagen, F., Hautzinger, M.* & Klein*, J. P. (2018). The association between adherence and outcome in an Internet intervention for depression. Journal of Affective Disorders, 229, 443-449. *split authorship for first and last authors
Klein, J. P., Späth, C., Schröder, J., Meyer, B., Greiner, W., Hautzinger, M., Lutz, W., Rose, M., Vettorazzi, E., Andersson, G., Hohagen, F., Moritz, S. & Berger, T. (2017b). Time to remission from mild to moderate depressive symptoms: One year results from the EVIDENT-study, an RCT of an internet intervention for depression. Behaviour Research & Therapy, 97, 154-162.
Klein, J.P., Gamon, C., Späth, C., Berger, T., Meyer, B., Hohagen, F., Hautzinger, M., Lutz, W., Vettorazzi, E., Moritz, S. & Schröder, J. (2017a). Does recruitment source moderate treatment effectiveness? A subgroup analysis from the EVIDENT study, a randomised controlled trial of an internet intervention for depressive symptoms. BMJ Open. 7, e015391.
Klein, J. P., Berger, T., Schröder, J., Späth, C., Meyer, B., Caspar, F., Lutz, W., Arndt, A., Greiner, W., Gräfe, V., Hautzinger, M., Fuhr, K., Rose, M., Nolte, S., Löwe, B., Anderssoni, G., Vettorazzi, E., Moritz, S. & Hohagen, F. (2016). Effects of a Psychological Internet Intervention in the Treatment of Mild to Moderate Depressive Symptoms: Results of the EVIDENT Study, a Randomized Controlled Trial. Psychotherapy & Psychosomatics, 85, 218-228.
Klein, J. P., Berger, T., Schröder, J., Späth, C., Meyer, B., Caspar, F. & Moritz, S. (2013). The EVIDENT-trial: Protocol and rationale of a multicenter randomized controlled trial testing the effectiveness of an online-based psychological intervention. BMC Psychiatry, 13, 239.