Clinical Foundations
Clinical psychology applies psychological science to the understanding, assessment, and treatment of psychological disorders. This skill covers the major categories of psychopathology, the dominant personality theories that inform clinical conceptualization, and the evidence-based therapeutic approaches used in practice. The organizing framework is the biopsychosocial model: psychological disorders arise from the interaction of biological vulnerabilities, psychological processes, and social-environmental factors.
Agent affinity: rogers (person-centered therapy, humanistic perspective), hooks (intersectionality in mental health), skinner-p (behavioral interventions, reinforcement-based treatment design)
Concept IDs: psych-psychological-disorders, psych-treatment-approaches, psych-learning-theory, psych-behavior-reinforcement
Clinical Domains at a Glance
| # | Domain | Core Questions | Key Frameworks | |---|---|---|---| | 1 | Anxiety disorders | What distinguishes normal anxiety from disorder? How do maintenance cycles work? | Cognitive model (Beck), learning theory, neurobiology | | 2 | Depressive disorders | What causes depression? What maintains it? | Beck's cognitive triad, learned helplessness, monoamine hypothesis | | 3 | Personality theories | How do we model stable individual differences? | Big Five, psychodynamic, humanistic, social-cognitive | | 4 | Therapeutic approaches | What works for whom, and how? | CBT, psychodynamic, person-centered, behavioral, pharmacological |
Domain 1 -- Anxiety Disorders
Anxiety is a normal adaptive response to threat. It becomes a disorder when it is disproportionate to the actual threat, persistent, and causes significant distress or functional impairment.
Generalized Anxiety Disorder (GAD)
Excessive, uncontrollable worry about multiple life domains (health, finances, relationships, minor matters) occurring more days than not for at least six months. Accompanied by restlessness, fatigue, difficulty concentrating, irritability, muscle tension, and sleep disturbance. The cognitive model (Borkovec, 1994) proposes that worry is a verbal-linguistic avoidance strategy that suppresses more distressing emotional imagery.
Panic Disorder
Recurrent unexpected panic attacks -- sudden surges of intense fear peaking within minutes, with physical symptoms (pounding heart, shortness of breath, chest pain, dizziness, numbness) and cognitive symptoms (fear of dying, fear of losing control). Clark's (1986) cognitive model: catastrophic misinterpretation of bodily sensations ("my heart is pounding, I must be having a heart attack") creates a positive feedback loop that escalates anxiety into panic.
Specific Phobias
Marked, disproportionate fear of a specific object or situation (animals, heights, blood, flying, enclosed spaces). Exposure produces immediate anxiety. The person recognizes the fear is excessive but avoids the stimulus anyway. Conditioning models (Mowrer's two-factor theory): phobias are acquired through classical conditioning and maintained through operant conditioning (avoidance reduces anxiety, negatively reinforcing the avoidance behavior).
Obsessive-Compulsive Disorder (OCD)
Obsessions (intrusive, unwanted thoughts) and compulsions (repetitive behaviors performed to reduce obsession-related distress). Common themes: contamination/washing, symmetry/ordering, harm/checking, forbidden thoughts. The cognitive-behavioral model: everyone has intrusive thoughts, but OCD patients interpret them as personally significant, dangerous, or morally unacceptable, leading to compulsive neutralization attempts that paradoxically strengthen the obsession.
Post-Traumatic Stress Disorder (PTSD)
Following exposure to actual or threatened death, serious injury, or sexual violence. Symptoms cluster into: (1) intrusion (flashbacks, nightmares), (2) avoidance (of trauma reminders), (3) negative alterations in cognition/mood (guilt, detachment, inability to experience positive emotions), (4) hyperarousal (exaggerated startle, hypervigilance, sleep disturbance). Ehlers and Clark (2000) cognitive model: PTSD persists when the trauma memory is poorly integrated and the individual appraises the trauma or its aftermath in an excessively negative way.
Domain 2 -- Depressive Disorders
Major Depressive Disorder (MDD)
Five or more symptoms during a two-week period, including at least depressed mood or loss of interest/pleasure: weight/appetite change, insomnia or hypersomnia, psychomotor agitation or retardation, fatigue, worthlessness/guilt, concentration difficulty, suicidal ideation. Lifetime prevalence approximately 17% in the US. Women are affected at roughly twice the rate of men.
Beck's cognitive triad
Aaron Beck (1967) proposed that depression is maintained by negative automatic thoughts in three domains:
- Negative view of self -- "I am worthless, inadequate, defective"
- Negative view of the world -- "The world is unfair, demanding, defeating"
- Negative view of the future -- "Nothing will ever get better"
These thoughts arise from underlying schemas (core beliefs) formed through early experience, activated by stressful life events.
Learned helplessness
Seligman (1975) showed that animals exposed to inescapable shock later failed to escape even when escape was possible. The reformulated model (Abramson, Seligman, & Teasdale, 1978) emphasized attributional style: depression-prone individuals attribute negative events to internal ("it's my fault"), stable ("it will always be this way"), and global ("it affects everything") causes.
Biological factors
The monoamine hypothesis proposes that depression results from deficiency in serotonin, norepinephrine, and/or dopamine. SSRI antidepressants increase synaptic serotonin. However, the monoamine hypothesis is oversimplified: SSRIs increase serotonin within hours but take weeks to produce clinical improvement, suggesting downstream neuroplastic changes are the actual mechanism. The neurotrophin hypothesis (Duman et al., 1997) implicates reduced BDNF (brain-derived neurotrophic factor) and hippocampal atrophy, reversed by antidepressants and exercise.
Bipolar Disorders
Bipolar I: at least one manic episode (elevated/expansive/irritable mood, decreased sleep need, grandiosity, pressured speech, risky behavior, lasting at least one week). Bipolar II: hypomania (less severe, shorter duration) plus major depressive episodes. Lithium remains the gold-standard mood stabilizer. Heritability is among the highest of any psychiatric disorder (~85%).
Domain 3 -- Personality Theories
Psychodynamic (Freud and successors)
Freud proposed three structures (id, ego, superego), psychosexual stages, and defense mechanisms (repression, projection, displacement, rationalization, sublimation). Modern psychodynamic theory (object relations, attachment theory) has moved beyond Freud's drive theory but retains the emphasis on unconscious processes, early relationships, and internal conflict. Defense mechanisms have been empirically validated as a hierarchical maturity continuum (Vaillant, 1977).
Trait theories: The Big Five
The Five-Factor Model (Costa & McCrae, 1992) identifies five broad, stable, partially heritable personality dimensions:
| Factor | High pole | Low pole | |---|---|---| | Openness | Curious, creative, intellectually adventurous | Conventional, practical, routine-preferring | | Conscientiousness | Organized, disciplined, achievement-oriented | Disorganized, impulsive, careless | | Extraversion | Outgoing, energetic, sociable | Quiet, reserved, solitary | | Agreeableness | Warm, cooperative, trusting | Competitive, skeptical, antagonistic | | Neuroticism | Anxious, moody, emotionally reactive | Calm, stable, resilient |
The Big Five predict job performance (conscientiousness), relationship quality (agreeableness, neuroticism), mental health (neur