
Feasibility Randomized Controlled Trial Using a 'Leapfrog' Design
AnhedoniaDepressionThis study is a small-scale randomized controlled trial (RCT) using a 'Leapfrog' design (Blackwell, Woud, Margraf, & Schönbrodt, 2019) with the aim of investigating feasibility of this design in the context of an RCT of an internet-delivered intervention. The leapfrog design will be applied to a simple cognitive training intervention, imagery cognitive bias modification (imagery CBM), completed over a four-week training period. The trial will start with the three arms described in the initial registration, but these will be removed and new arms added over the course of the trial on the basis of sequential Bayesian analyses.

Study to Evaluate the Efficacy and Safety of Once-Weekly Oral NBI-1065846 in the Treatment of Anhedonia...
AnhedoniaMajor Depressive DisorderTo evaluate the efficacy of NBI-1065846 compared with placebo on improving symptoms of anhedonia in participants with major depressive disorder (MDD).

DTA (Dopaminergic Therapy for Anhedonia) Study
DepressionAnhedoniaThe purpose of this 6-week, double-blind, placebo-controlled, crossover study is to explore new treatment options for people with depression who have high inflammation and anhedonia. Thirty-five male and female participants with depression, between the ages of 25-55 years of age, will be randomized to two study tracks (A and B) to receive both placebo and three doses of L-DOPA, given in different orders. Increases or decreases in each dose will occur gradually over 6 weeks of the study. Participants will complete lab tests, medical and psychiatric assessments, neurocognitive testing and functional MRI (fMRI) scans as part of the study. The total length of participation is about 2 months.

The Effect of Computerized Cognitive Training on Mood and Thinking Style Amongst Patients in Inpatient...
DepressionAnxiety1 moreThe purpose of this randomized controlled trial is to establish feasibility and provide initial estimates of efficacy of two computerized cognitive training procedures (a form of Positive Mental Imagery Training, PMIT, and a form of Cognitive Control Training, CCT) delivered as adjuncts to treatment as usual (TAU) in inpatient mental health treatment settings.

Telemedicine for Women With Anhedonia in Bipolar and Unipolar Disorder
DepressionBipolar Disorder1 moreAnhedonia, characterized as (a) the diminished motivation to participate in activities, and/or (b) diminished enjoyment of a pleasurable activity are common symptoms among women diagnosed with mood disorders. This trial aims to test three treatments adapted to reduce anhedonia. The investigators will compare three treatment groups, specifically, two doses of Behavioral Activation treatment for anhedonia (i.e., 12 weeks vs. 8 weeks of BA) with an active comparator treatment, Bipolar Disorder Collaborative Care (12 weeks of BDCC). BA is a psychotherapy approach that helps participants to identify and modify environmental sources of their depression. BDCC is a supportive care approach that educates participants to optimize their medication initiation or their existing medication regimen. The time frame for this study will be between 12-14 weeks. Specifically, participants will be evaluated and enrolled within one week, then received up to 12 weeks of treatment (tracked through this time) and then complete two evaluations (one at week 8) and another at the end of treatment (an expected average of 12-14 weeks after enrolling into treatment). Primary analyses aim to compare the dose-mechanism change in BA relative to a standard medication optimizing protocol, BDCC. The secondary analyses are to evaluate individual differences in stated patient preferences for treatment, and group differences in treatment effect on anhedonia, side effects, and quality of life.

The Study of Effectiveness of rTMS on Rumination and Anhedonia in Patients With Major Depressive...
Major Depressive DisorderBipolar DepressionRumination is significantly frequent in major depressive disorder. However, not a lot of studies have investigated the effects of repetitive transcranial magnetic stimulation on rumination and its electrophysiological correlates. This study recruited 61 participants who were randomly assigned to sham, bilateral, or unilateral stimulation groups to investigate the potential differences between these stimulation protocols and changes in the behavioral and electrophysiological outcomes after treatment.

The Effect of CBT- Based Weight Loss Program on Obesity
ObesityHypercholesterolemia3 moreThe investigators purpose is to study how CBT (cognitive behavioral therapy)-based weight loss program affects on eating behavior, weight loss and risk factors for CHD (coronary heart diseases)and type 2 diabetes. Moreover, the investigators aim is to recognize subjects suffering from anhedonia (one of the core symptoms of depression, lack of pleasure) and follow how they benefit from the program in order to achieve maintained weight loss. Also, the associations between weight loss, physical activity and musculoskeletal disorders are studied.

The Effect of an Edible Algal Extract (Ulva Lactuca) on the Component of Depression in Healthy Volunteers...
Anhedonia in Healthy VolunteersThe effects of the seaweed extract were evaluated on the animal model equivalent of depression compared with a control group treated with the carrier (spring water) and a reference group treated with Imipramine and showed significative effect. This clinical trial was intended to confirm in humans the potential efficacy identified in animals. The primary objective was to compare against a placebo the effect of Ulva L.L extract in healthy volunteers whose anhedonia was characterized by a component of depression.

Magnetic Stimulation of the Brain in Schizophrenia or Depression
SchizophreniaDepression2 moreThe primary objective is to evaluate if repetitive transcranial magnetic stimulation (rTMS) with theta burst frequency over dorsomedial prefrontal cortex (DMPFC) is an effective treatment for negative symptoms (anhedonia and avolition) in schizophrenia or depression. Other objectives are to increase the understanding of the underlying neurobiology of negative symptoms and the mechanisms for the treatment effect of rTMS.

Depressed Mood and Anhedonia in Healthy Adults
AnhedoniaDepressed MoodThe aim of this study is to evaluate the effect of nutraceutical supplement on depressed mood and anhedonia in volunteers after 8 weeks of consumption.