Notes on Etiology, Pathogenesis, and Biopsychosocial Perspectives
Etiology and Pathogenesis
The speaker emphasizes understanding murky but important terms and the detective-like role in clinical work: clinicians gather information from clients, using theories to make sense of data, while recognizing that each person has a narrative and may have a fixed point of view.
Therapists act as outsiders who can view clients’ lives from a different vantage point, which is a unique and valuable aspect of therapy.
Etiology: what is causing the disease or mental illness; the factors that have contributed to its presence.
Pathogenesis: the process by which those causes turn into the disease; the sequence of events from cause to disorder.
Nature vs. nurture dichotomy: etiology aligns with genetics and what we’re born with; pathogenesis aligns with environmental and nurture factors that shape how the condition develops.
Vulnerability in a developmental psychology sense: what underlies susceptibility to a disorder; involves risk factors and genetic predispositions.
Importance of collecting a client’s history to identify predispositions and vulnerability factors; helps determine what someone might be more susceptible to or what to monitor.
A single event does not always lead to a single outcome or disorder (e.g., PTSD): trauma exposure increases risk but does not guarantee PTSD.
Family and genetic considerations: siblings raised in the same home can show different presentations; twin studies show nuanced results, including identical twins with similar and different outcomes.
Diathesis-Stress Model (conceptual framework): same environmental inputs can yield different outcomes depending on underlying vulnerability; the analogy used is pouring the same amount of water into cups of different sizes—one overflows, one fills halfway due to differences in the ‘cup’ (vulnerability).
Claudia/Samantha explanation of the diathesis-stress metaphor: two people may respond differently to the same event because of their differing environmental histories and genetic factors.
Diagnostic criteria (DSM) provide a framework to recognize similarities and cluster symptoms, but the system is not a perfect science and there is substantial nuance.
Surface similarity vs. latent similarity: two people may appear similar externally (surface) but have different internal histories; conversely, similar internal processes may present differently on the surface.
Baseline concept: understanding a person’s normal functioning over time helps interpret symptom changes; asks what is baseline for sleep, appetite, functioning, etc.
Development is lifelong: brain and body continue to develop from birth to death; rapid development in childhood, but ongoing changes across the lifespan.
DSM’s role: to organize abstract, subjective symptoms into recognizable patterns, while acknowledging the inherent complexity and variability of human conditions.
The discussion highlights the interplay between surface-level presentations and deeper, historical factors in understanding mental health.
Vulnerability and Risk Factors
Vulnerability refers to underlying predispositions that make someone more susceptible to mental health disorders.
Risk factors can be environmental or biological; examples discussed include:
SES (socioeconomic status)
Genetics and family dynamics
Exposure to trauma and trauma responses
Race, ethnicity, geographic location, and cultural norms
How these factors interact with one another to shape outcomes
Pre-dispositions help determine how an individual might respond to stressors or precipitating events, and they guide what questions to ask during assessment.
The clinician’s job is to recognize that a client’s current presentation may reflect underlying vulnerabilities that may not be immediately obvious in the presenting problem.
The idea that predispositions help explain why a single event does not deterministically produce a disorder; individuals with more risk factors are more likely to develop a disorder after a trauma, but still not guaranteed.
The importance of considering both biological and environmental contributors when evaluating risk and making sense of presentations.
Precipitating Events and Trauma
A precipitating event is a singular event that can trigger the onset of symptoms, but its impact depends on the individual’s underlying vulnerability.
PTSD example: exposure to trauma does not automatically yield PTSD; the development of PTSD depends on vulnerability and context.
Both the precipitating event and existing vulnerabilities shape outcomes; a more vulnerable individual is at higher risk after trauma, whereas a person with stronger support and fewer risk factors may be more resilient.
The transcript emphasizes considering both immediate events and long-standing factors when evaluating onset and course of symptoms.
The Diathesis-Stress Model
Diathesis-Stress Model explanation: same environmental input (stress) can lead to different outcomes due to varying levels of diathesis (vulnerability).
The cup metaphor: multiple factors interact so that outcomes vary even with similar stressors.
In practical terms:
People with higher vulnerability plus a stressor are more likely to develop a disorder.
People with lower vulnerability and/or higher protective factors may experience less severe or no disorder despite stress.
The model helps explain why diagnoses like anxiety or depression can present very differently across individuals, even when criteria are met.
The model is not deterministic; it accounts for individual histories, resilience, and support.
Representational equation (conceptual): where V represents vulnerability/diathesis and S represents precipitating stress, moderated by protective factors.
Development Across the Lifespan
Development is ongoing from birth to death, not confined to childhood.
Brain and body undergo biological changes across the lifespan; there is more rapid development in childhood, but changes continue into adulthood.
The DSM organizes understanding of symptoms into clusters, but it does not capture every nuance; development can shift symptom patterns over time.
Clinicians should consider a person’s lifetime development and how early experiences shape current functioning.
DSM and Diagnostic Nuance
The DSM aims to create order from abstract subjective symptoms and human experiences by identifying patterns and clusters.
It is not perfect or entirely deterministic; there is a lot of gray area and nuance in real-world presentations.
Surface similarity vs latent similarity: outward symptoms may look the same while underlying causes/history differ, or vice versa.
Clinicians should use DSM criteria to guide questioning (e.g., how long symptoms have lasted, sleep, appetite, functional impact) but recognize limitations and individual variation.
The Biopsychosocial Model and Biological Hypothesis
Biopsychosocial model will be used to analyze client cases; it integrates biological, psychological, and social factors.
Biological hypothesis focuses on genetics and heredity, family dynamics, and physical processes in the body.
It is acknowledged that nurture interacts with biology; even with a genetic predisposition, environmental factors can modulate expression and severity.
Epigenetics: the environment can modify how genes are expressed, influencing the severity and presentation of psychopathology. For example, favorable environments may mitigate risk, whereas adverse environments may exacerbate it.
The model supports the idea that mental health outcomes emerge from complex interactions among biological, psychological, and social factors, rather than a single cause.
The Role of Parents and Caregivers
Parents and primary caregivers shape children’s development by providing stability, nurture, and modeling of coping strategies.
Studies suggest that having at least one stable and nurturing caregiver is crucial for healthy mental health development; secure attachment provides a “secure base” for exploring and building healthy relationships.
Caregiving influences a child’s world schema and expectations about relationships and social interactions.
Language used with children matters; what children observe caregivers doing (modeling) is often more impactful than what caregivers say.
Early experiences with conflict, stress, and how emotions are regulated by caregivers influence later mental health outcomes.
Even with strong caregiving, mental health disorders can still occur, indicating that risk is not deterministic and multiple factors contribute.
In clinical practice with children, clinicians should assess family dynamics, parenting styles, and role-modeling, not just reported symptoms.
For adults, early childhood experiences continue to influence current functioning and vulnerability to stress-related disorders.
Implications for Clinical Practice
Clients may present with symptoms (e.g., depression or anxiety) that do not fully reflect what they are actually experiencing or struggling with; clinicians must probe beyond stated concerns.
The duty to ask about hidden or underreported areas (e.g., eating behaviors, substance use) because secrecy is often part of many disorders.
Use diagnostic criteria to guide targeted questions: sleep patterns, appetite, energy, duration, changes over time, functioning, and onset.
Recognize that clients are providing their experience, which may be incomplete or biased; clinicians should seek additional information and corroborating history when appropriate.
The biopsychosocial approach helps structure clinical interviews and case formulations by considering multiple interacting domains.
When collecting history, consider baseline functioning to assess degree and trajectory of change and to set realistic expectations for symptom reduction.
Acknowledge that there is no one-size-fits-all explanation; multiple etiologies and pathways can lead to similar presentations, and identical diagnoses can manifest differently across individuals.
Real-World and Ethical Considerations
The discussion acknowledges complexity and nuance; clinicians should avoid assuming a single cause or a uniform presentation within a diagnosis.
Cultural, geographic, and socio-economic contexts influence how symptoms are experienced, expressed, and interpreted; clinicians must attend to these factors when formulating and diagnosing.
Ethical implication: avoid pathologizing normal variation; respect client autonomy and acknowledge multiple valid narratives and explanations.
The value of flexibility: maintain openness to different theories and approaches; integrate what feels right for the client and discard what doesn’t, as needed.
Practicum and Practice Opportunities (Contextual Note)
The material mentions practicum opportunities that have been expanded over time; the list is not exhaustive and can be added to.
This underscores the ongoing nature of clinical training and the importance of engaging with diverse cases to apply biopsychosocial formulations in real-world settings.
Quick Reference: Key Terms and Concepts
Etiology: causes or factors contributing to the presence of a disease or disorder.
Pathogenesis: the process by which causes develop into a disease.
Vulnerability/Diathesis: inherent predispositions that increase risk for a disorder.
Risk factors: environmental or biological factors increasing susceptibility.
Precipitating event: a single event that may trigger symptom onset.
Diathesis-Stress Model: outcomes depend on the interaction between vulnerability and stress; expressed as a function P(Disorder) = f(V, S).
Latent vs surface similarity: internal mechanisms vs external presentations.
Baseline functioning: an individual’s typical level of functioning against which changes are measured.
Biopsychosocial model: integrative framework considering biological, psychological, and social factors.
Epigenetics: environmental influences that alter gene expression without changing the DNA sequence.
Secure base: a stable caregiver relationship that supports exploration and development in children.
DSM: Diagnostic and Statistical Manual of Mental Disorders, used to categorize and organize mental health conditions, with inherent limitations and nuances.