Emotion and Clinical Psychology: Depression and Bipolar Disorder

Clinical Psychology Perspectives on Emotion

  • The Rationale for Studying Emotion in Clinical Settings

    • Analogy of the Machine: A fundamental principle in clinical psychology is that understanding a system often occurs most effectively when attempting to fix it. This applies directly to emotions; by studying emotional disorders, psychologists gain insights into "normal" emotional functioning.

    • Reciprocal Learning: This is a two-way process where learning about disorders informs the understanding of healthy emotions, and a deeper grasp of healthy emotions enables the development of better treatments for those with emotional difficulties.

  • Historical Context of Emotional Research

    • The Behaviorist Era: Throughout the 1900s, the dominance of behaviorism led to a period where few psychology researchers addressed questions regarding emotion. This trend lasted until approximately the 1980s.

    • Clinical Continuity: Despite the behaviorist shift in academic research, clinical psychologists and psychiatrists were perpetually required to address emotion in their practice.

  • Emotional Manifestations in Psychological Disorders

    • While patients may seek help for non-emotional primary issues (e.g., ADHD), many psychiatric disorders involve core emotional difficulties:

      • Obsessive-Compulsive Disorder (OCD): Characterized by excessive feelings of guilt (D’Olimpio & Mancini, 2014).

      • Dysregulation Parameters: Emotions become problematic when they are too strong, too weak, too persistent, too brief, or overly prone to fluctuation (Gross & Jazaieri, 2014).

      • Schizophrenia: Patients may display inappropriate emotions (e.g., laughter during sad occasions) and typically face impairments in understanding the emotional expressions of others (Green et al., 2015).

Diagnosis in Clinical Psychology and Psychiatry

  • Evolution of Diagnostic Practices

    • Early Era: Historically, therapists made few distinctions between types of disorders. The primary categories were schizophrenia and depression, often broadly classified under neurosis or psychosis.

    • Conceptual Confusion: Historically, "neurosis" was viewed as a psychological problem, whereas "psychosis" was assumed to be a neurological problem.

    • Avoidance of Stigma: Many early therapists avoided giving formal diagnoses altogether to protect clients from the social stigma of mental illness.

  • Drivers for Precise Classification

    • Financial/Insurance Requirements: Insurance companies became more likely to reimburse treatment for a specifically diagnosed disorder rather than general talk therapy.

    • Medical Model Alignment: Precise diagnosis allows therapists to determine specific evidence-based treatments, mirroring the scientific methodology used by medical doctors.

  • The Diagnostic and Statistical Manual of Mental Disorders (DSM)

    • Development: Created by the American Psychiatric Association (2013) to standardize diagnostic definitions for therapists and researchers.

    • Current Version: The latest revision is the DSM-5-TR (released in 2022).

  • Challenges and Limitations of the DSM

    • Symptom Complexity: The criteria can allow for a staggering number of variations. For example, panic disorder has more than 23,00023,000 possible symptom combinations, and post-traumatic stress disorder (PTSD) includes more than 636,000636,000 possible combinations (Galatzer-Levy & Bryant, 2013).

    • Lack of Biological Specificity: Diagnoses are entirely symptom-based with no available laboratory tests. This leads to overlapping symptoms where patients often fit multiple diagnoses simultaneously.

    • The Arbitrariness of "Normal": Since symptoms like anxiety and depression exist on a continuum, the line between normal variation and pathology is often arbitrary.

    • Distress and Impairment Criterion: A condition is only a disorder if it causes significant life impairment.

      • Scenario A (Phobia): Two people fear flying. It is a phobia for the frequent business traveler, but not for the domestic homebody who never needs to travel.

      • Scenario B (Alcoholism): Heavy drinking is judged as alcoholism based on whether it impairs employment, finances, family life, or health.

Taxonomy and Symptomology of Mood Disorders

  • Defining Key Terms

    • Affect: The underlying experience and expression of feeling, mood, or attachment.

    • Mood (Affective) Disorders: Mental health conditions where emotional states are persistently disturbed, impacting thought, behavior, and daily functioning. They involve abnormalities in the intensity, duration, or regulation of mood.

  • Core Symptom Clusters Across Affective Disorders

    • Emotional: Persistent sadness, mood disturbance, irritability, or emotional numbness.

    • Cognitive: Negative thinking biases, rumination, impaired attention, and difficulty with decision-making.

    • Behavioral: Social withdrawal or psychomotor agitation.

    • Physiological: Fatigue, changes in sleep patterns, and changes in appetite.

  • The Four Pillars of Emotion

    • Emotion is conceptualized through four aspects: Cognitive appraisals, Feelings, Physiological responses/changes, and Behaviors.

Characteristics of Major Depression

  • Clinical Presentation

    • Intensity: Much more severe and prolonged than standard discouragement or periodic sadness. Feelings of sadness and helplessness occur most of the day, every day, for weeks.

    • Anhedonia: The inability to imagine enjoying anything; includes sense of worthlessness and suicidal ideation.

    • Secondary Impairments: Trouble sleeping and cognitive deficits (low motivation, attention problems, impaired memory). Notably, cognitive limitations often persist even after mood symptoms are treated (Gonda et al., 2015).

    • Biological Markers: Some patients show an impaired sense of smell.

  • Demographics and Duration

    • Natural Course: Episodes can last weeks, months, or years, but most people eventually improve even without clinical treatment.

    • Gender Gap: Depression is significantly more common in women during the reproductive years, though rates are roughly equal before puberty and after menopause.

  • Symptom Specificity: Absence of Happiness

    • Research suggests the absence of positive affect is a more reliable marker than the presence of sadness.

    • Beeper Study (Peters et al., 2003): Used unpredictable beeper signals to achieve ecological validity. Results showed depressed individuals had an average amount of unpleasant experiences but a significantly lower than average number of pleasant ones.

    • Visual Reactivity Studies (Rottenberg et al., 2002): Depressed participants reacted normally to sad or frightening films but failed to smile or show reaction to comedies or pleasant photographs.

Varieties and Subtypes of Depression

  • Categorical Variations

    • Anxious Depression: High levels of anxiety paired with depressive symptoms.

    • Melancholic Depression: Severe form marked by a total lack of pleasure.

    • Psychotic Depression: Includes thought disorders similar to schizophrenia.

    • Atypical Depression: Characterized by increased appetite and increased sleep (reverse of typical insomnia/anorexia).

    • Dysthymia (Persistent Depressive Disorder): Emphasizes chronic sad mood rather than lack of pleasure; episodes last for years rather than months.     

  • Clinical Utility Note: Therapists are often unenthusiastic about these distinctions because they do not consistently predict which treatment will be most effective (Davidson, 2007).

Etiology and Causes of Depression

  • The Stress-Diathesis Model

    • Depression arises from the interaction between an underlying vulnerability (diathesis/predisposition) and external environmental stressors.

    • The diathesis can be biological (genetic) or non-genetic (environmental history).

  • Risk Factors

    • Family history (especially for severe/recurrent cases).

    • History of childhood trauma.

    • Major stressful life changes (stress is the primary environmental factor).

  • Learned Helplessness (Seligman & Maier, 1967)

    • Experimental Setup: Dogs were harnessed and subjected to electric shocks. Group A could press a panel to stop it; Group B had no control.

    • The Hurdle Phase: Later, dogs were put in a cage where they could jump a hurdle to escape a shock signaled by a tone.

    • Results: Group A quickly learned to jump the hurdle. Group B, having previously learned they had no control, made no attempt to escape the shocks even though the way out was clear. This behavior mirrors clinical depression.

Biological and Genetic Mechanisms

  • Dopamine and the Reward System

    • Prediction Error: Dopaminergic neurons encode the value of rewards; they respond to unexpected rewards to facilitate learning and motivation.

    • Nucleus Accumbens: In depressed individuals, this area (located where the caudate nucleus and putamen meet) becomes less responsive to reward. It is normally activated by sexual excitement, music, sugar, and pleasant imagery.

  • Serotonin and Transporters

    • Reuptake: The process where the presynaptic neuron reabsorbs neurotransmitters through proteins called transporters.

    • Serotonin Transporter (SERT): Controlled by the gene SLC6A4SLC6A4, it regulates the duration and strength of serotonin signaling.

  • Genetic Susceptibility (Caspi et al., 2003)

    • Study: Tracked 847847 young adults over 55 years.

    • Gene Variants: Identified the "short" and "long" versions of the serotonin transporter gene.

    • Findings: Individuals with two short alleles showed a major increase in depression risk when experiencing high stress. Those with two long alleles showed only a slight increase in risk under stress. The short gene is a marker for general emotional reactivity (magnifying both good and bad responses), not just depression.

Treatment Modalities for Mood Disorders

  • Pharmacological Options

    • Tricyclics: Block reuptake of serotonin, dopamine, and norepinephrine.

    • SSRIs: Specifically block the center of the serotonin transporter.

    • MAOIs: Block the enzyme Monoamine Oxidase to increase available neurotransmitters.

    • Ketamine (Atypical): Antagonizes NMDA-type glutamate receptors; provides rapid but temporary relief and may cause hallucinations.

    • Effectiveness: Antidepressants are moderately more effective than placebos but have a limited effect on suicide rates. Finding the right drug is often a trial-and-error process taking 66 weeks or more.

  • Psychotherapy and Lifestyle

    • Cognitive Behavioral Therapy (CBT): Focuses on changing explanatory styles and dysfunctional attitudes. Research shows CBT and drugs are roughly equal in effectiveness, though CBT effects often last longer.

    • Exercise: Regular, moderate-intensity exercise (even walking) is the simplest, least expensive treatment.

    • Diet: Omega-3 fatty acids and vitamins B6B6, B9B9, and B12B12 show potential value.

  • Biological Interventions

    • Electroconvulsive Therapy (ECT): Electrically induced seizures; usage declined after the 1950s drug boom.

    • Deep Brain Stimulation (DBS): Battery-powered device implanted to stimulate specific brain areas (experimental).

    • Transcranial Magnetic Stimulation (TMS): Non-invasive magnetic stimulation, often targeting the dorsolateral prefrontal cortex.

Bipolar Disorder

  • Clinical Presentation

    • Alternation: Movement between depression and mania.

    • Mania Symptoms: Restless activity, excitement, excessive confidence, rambling speech, and loss of inhibition.

    • Types: Bipolar I (full manic episodes) and Bipolar II (hypomanic episodes).

  • Treatment: Lithium Salts

    • Lithium acts by stabilizing mood and alleviating hyperexcitability in hippocampal cells. The dosage must be strictly regulated to avoid toxicity.

    • Getting consistent, adequate sleep is a crucial supplementary strategy for stabilizing mood and preventing new episodes.