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Related Concept Videos

Depressive Disorders: MDD and Dysthymia01:27

Depressive Disorders: MDD and Dysthymia

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Depressive disorders are a group of mental health conditions characterized by pervasive feelings of sadness, diminished pleasure in life, and a significant impact on daily functioning. These conditions are most prevalent in individuals during their 30s and affect women at twice the rate of men. Contrary to popular belief, younger individuals are generally more susceptible to these disorders than older adults. Two key types of depressive disorders include Major Depressive Disorder (MDD) and...
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Depressive Disorders: Etiology01:27

Depressive Disorders: Etiology

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Depressive disorders result from a complex interplay of biological, psychological, and sociocultural factors, each contributing uniquely to the development and persistence of the condition. Understanding these factors provides critical insight into the multifaceted nature of depression.
Biological Factors in Depression
Biological predispositions significantly influence the risk of developing depressive disorders. Genetic studies highlight the role of variations in the serotonin transporter...
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Antidepressant Drugs: MAOIs and Other Agents

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Atypical antidepressants, including bupropion (Wellbutrin), mirtazapine (Remeron), nefazodone (Serzone), trazodone (Desyrel), and vilazodone (Viibryd), offer unique mechanisms of action. Bupropion weakly inhibits dopamine and norepinephrine reuptake, aiding depression treatment and smoking cessation, with a low risk of sexual dysfunction. Mirtazapine enhances serotonin and norepinephrine neurotransmission, leading to sedation, increased appetite, and weight gain. As a result, it helps treat...
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Long-term Depression01:03

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Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
Calcium Ion Concentration Mechanism
If over...
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Long-term Depression01:05

Long-term Depression

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Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
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Bipolar Disorder01:30

Bipolar Disorder

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Bipolar disorder is a chronic mental health condition marked by significant mood fluctuations, including episodes of mania and depression. Elevated energy levels, heightened mood or irritability, impulsive behavior, reduced sleep needs, rapid speech, racing thoughts, inflated self-esteem, and distractibility characterize mania. Individuals with bipolar disorder often alternate between depressive and manic states, with periods of emotional stability lasting an average of six months to a year.
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Related Experiment Video

Updated: Jan 7, 2026

Author Spotlight: Unveiling the Connection Between Sleep Disorders and Cognitive Symptoms in Depression
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Author Spotlight: Unveiling the Connection Between Sleep Disorders and Cognitive Symptoms in Depression

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Delayed mood transitions in major depressive disorder.

Jakob Korf1

  • 1University of Groningen, Centre of Psychiatry, Groningen, The Netherlands.

Medical Hypotheses
|March 12, 2014
PubMed
Summary

Major depressive disorder (MDD) treatment may fail because the brain’s mood-stabilizing mechanisms are compromised. This study suggests mood transitions in MDD are unpredictable and rapid, regardless of psychological factors.

Area of Science:

  • Neuroscience
  • Psychiatry
  • Clinical Psychology

Background:

  • Major depressive disorder (MDD) is characterized by persistent low mood.
  • The underlying mechanisms of mood regulation and transition in MDD are not fully understood.
  • Current treatment approaches do not achieve remission in a significant patient proportion.

Purpose of the Study:

  • To test the hypothesis that mood-normalizing transitions fail in a substantial number of MDD patients.
  • To investigate the role of psychological content versus biological mechanisms in mood transitions.
  • To explore the temporal dynamics of mood episodes in MDD.

Main Methods:

  • Review of existing literature on mood transitions in MDD.
  • Analysis of data from studies involving deep brain stimulation, sleep deprivation, and electroconvulsive treatment.

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  • Examination of epidemiological and clinical data, including decay models of recovery time and recurrent depression patterns.
  • Discussion of recent theoretical models for random mood transitions.

    • Main Results:

    • Mood transitions can occur within minutes, days, or hours, as observed in various conditions and treatments.
    • Factors like deep brain stimulation, sleep deprivation, electroconvulsive treatment, and ketamine can facilitate rapid mood shifts in MDD.
    • Epidemiological data suggest very short depressive episode durations, independent of psychological content.
    • Mood fluctuations correlate with future therapeutic success in MDD patients.

    Conclusions:

    • The mechanism for mood transition appears compromised in major depressive disorder.
    • Mood regulation in MDD may be largely independent of psychological content.
    • These findings suggest a need for revised diagnostic criteria and therapeutic strategies for MDD.