Relevant Theories of Medical Psychology

Detailed notes covering Cognitive Theory, Biological Theory, Psychodynamic Theory, and Application of Schools of Thought to Health Care

Chapter 1: Cognitive Theory

1.1 Definition

1.2 Historical Background

Cognitive psychology emerged in the 1950s and 1960s as a reaction against the dominance of behaviorism, which had rejected the study of internal mental processes. The "cognitive revolution" was fueled by advances in computer science, linguistics, neuroscience, and mathematics. Researchers began to argue that behavior could not be fully explained without understanding the mental processes that mediate between stimulus and response.

Key milestones include:

• Noam Chomsky's (1959) critique of B.F. Skinner's verbal behavior, arguing that language acquisition requires innate cognitive structures.
• George Miller's (1956) paper on the "magical number seven," demonstrating limits on human information processing capacity.
• The development of the first digital computers, which provided a metaphor for understanding mental processes.
• Ulric Neisser's (1967) book Cognitive Psychology, which formally named and defined the field.

1.3 Core Concepts

1.3.1 The Information-Processing Model

The dominant framework in cognitive psychology is the information-processing model, which compares the human mind to a computer. Information flows through a series of stages:

1. Input (Sensory Register): Information from the environment is briefly held in sensory memory (approximately 0.5–3 seconds).
2. Attention and Pattern Recognition: Relevant information is selected and recognized.
3. Short-Term Memory (Working Memory): Information is temporarily held and manipulated (capacity: approximately 7±2 items; duration: approximately 20–30 seconds without rehearsal).
4. Long-Term Memory: Information is encoded and stored for extended periods, potentially indefinitely.
5. Output (Response): Retrieved information guides behavior, decisions, and responses.

1.3.2 Schemas

A schema is a mental framework or organized pattern of knowledge that helps individuals interpret and organize information about the world. Schemas include what we know and how we come to know it. They influence what we notice, how we interpret experiences, and how we remember events.

For example, a person who has a schema for "doctor" may include attributes such as white coat, stethoscope, clinic, and authority. When encountering someone who fits this schema, the person quickly recognizes them as a doctor. However, schemas can also lead to biases and stereotypes when they are inaccurate or overly rigid.

1.3.3 Assimilation and Accommodation

Jean Piaget introduced two key processes of cognitive adaptation:

• Assimilation: The process of incorporating new information into existing schemas. For example, a child who has a schema for "dog" (four-legged, furry, barks) may initially call a cat a "dog" because it fits the existing schema.
• Accommodation: The process of modifying existing schemas or creating new ones in response to new information that does not fit. The child eventually learns to distinguish cats from dogs, accommodating the schema.

1.3.4 Piaget's Stages of Cognitive Development

Jean Piaget (1896–1980) proposed that cognitive development occurs through a series of qualitative stages, each characterized by distinct ways of thinking:

1.3.5 Cognitive Biases and Heuristics

Daniel Kahneman and Amos Tversky demonstrated that human thinking is subject to systematic cognitive biases and heuristics (mental shortcuts):

• Availability Heuristic: Judging the likelihood of events based on how easily examples come to mind.
• Representativeness Heuristic: Judging probability based on how similar an event is to a prototype.
• Confirmation Bias: The tendency to seek, interpret, and remember information that confirms pre-existing beliefs.
• Anchoring Bias: Relying too heavily on the first piece of information encountered.

1.4 Cognitive Therapy

Cognitive therapy, developed by Aaron Beck, and cognitive-behavioral therapy (CBT), which integrates cognitive and behavioral principles, are among the most widely researched and practiced forms of psychotherapy. These approaches are based on the premise that distorted or maladaptive thinking patterns contribute to psychological distress.

Key techniques include:

• Cognitive restructuring: Identifying and challenging irrational or distorted thoughts.
• Behavioral activation: Increasing engagement in rewarding activities.
• Exposure therapy: Gradual confrontation with feared stimuli.
• Homework assignments: Practicing skills between sessions.

1.5 Clinical Relevance

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Chapter 2: Biological Theory

2.1 Definition

Biological psychology (also called biopsychology, behavioral neuroscience, or physiological psychology) is the branch of psychology that examines how biological processes — including the brain, nervous system, genetics, neurotransmitters, and hormones — influence behavior, thoughts, and emotions.

2.2 Historical Background

The biological perspective has roots extending back to ancient philosophers who debated the relationship between mind and body. However, modern biological psychology emerged in the 19th and 20th centuries through the integration of psychology with physiology, neurology, and genetics.

• Charles Darwin's theory of evolution provided the foundational logic: traits — including psychological traits — that increase reproductive fitness are preserved through natural selection.
• In the late 19th century, discoveries about the structure and function of neurons laid the groundwork for understanding the biological basis of behavior.
• Advances in the 20th and 21st centuries, including EEG, CT, MRI, PET, and genetic sequencing, have dramatically expanded the capacity to study behavior.

2.3 Core Concepts

2.3.1 The Nervous System

The nervous system is the body's primary communication network, consisting of:

• The Central Nervous System (CNS): The brain and spinal cord, which process and integrate information.
• The Peripheral Nervous System (PNS): Nerves outside the CNS that connect the CNS to the rest of the body. The PNS includes:
  • Somatic Nervous System: Controls voluntary movements and transmits sensory information.
  • Autonomic Nervous System (ANS): Controls involuntary functions. The ANS has two branches:
    • Sympathetic Nervous System: Activates "fight or flight" responses during stress.
    • Parasympathetic Nervous System: Promotes "rest and digest" functions during relaxation.

2.3.2 Neurons and Neural Communication

Neurons are the basic functional units of the nervous system. A typical neuron consists of:

• Dendrites: Branch-like structures that receive messages from other neurons.
• Soma (Cell Body): Maintains the life of the cell and processes incoming signals.
• Axon: A long, tube-like structure that carries the neural message to other cells.
• Axon Terminals: Rounded areas at the end of axon branches that communicate with other neurons.

Neurons communicate via neurotransmitters — chemical messengers released into the synapse (the microscopic gap between neurons) that bind to receptor sites on the receiving neuron. The action potential is an electrical impulse that travels down the axon, following the all-or-none principle (a neuron either fires completely or not at all).

2.3.3 Key Neurotransmitters

2.3.4 Brain Structures and Functions

2.3.5 Genetics and Behavior

The biological perspective emphasizes the role of genetics in shaping behavior:

• Genotype: The genetic makeup inherited from parents.
• Phenotype: The observable expression of genetic traits, influenced by both genes and environment.
• Heritability: The proportion of variation in a trait attributable to genetic differences among individuals.

Research methods include: Twin studies (monozygotic vs. dizygotic), Adoption studies, Family studies, and Molecular genetics.

2.3.6 The Endocrine System

Communicates through hormones — chemical messengers released into the bloodstream. Key hormones affecting behavior include:

• Cortisol: The primary stress hormone; elevated during "fight or flight" responses.
• Adrenaline (Epinephrine): Prepares the body for emergency action; increases heart rate and alertness.
• Thyroid Hormones: Regulate metabolism, energy, and mood.
• Insulin: Regulates blood glucose levels.
• Sex Hormones: Estrogen, progesterone, and testosterone influence sexual behavior, mood, and cognitive function.

2.4 Criticisms

• Reductionism: Reducing complex behaviors to purely biological factors, neglecting psychosocial/cultural influences.
• Determinism: Suggesting behavior is entirely governed by genetics/chemistry, potentially undermining free will.
• Correlational ambiguity: Brain abnormalities observed in disorders could be effects rather than causes.
• Ecological validity: Laboratory studies (scans) may not reflect natural activity.

2.5 Clinical Relevance

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Chapter 3: Psychodynamic / Psycho-analytic Theory

3.1 Definition

Psychoanalytic theory (also called psychodynamic theory) is a comprehensive theory of personality and psychotherapy developed by Sigmund Freud. It emphasizes the role of unconscious processes, early childhood experiences, and internal conflicts in shaping behavior, personality, and psychological disorders.

3.2 Historical Background

Sigmund Freud (1856–1939) was an Austrian neurologist who founded psychoanalysis. Working in Vienna in the late 19th and early 20th centuries, Freud developed his theories through clinical work with patients suffering from "hysteria" and other neurotic disorders. His methods included free association, dream analysis, and the analysis of "Freudian slips".

Major figures who extended or revised Freud's ideas include Carl Jung (analytical psychology), Alfred Adler (individual psychology), Melanie Klein (object relations), and Erik Erikson (psychosocial development).

3.3 Core Concepts

3.3.1 The Topographical Model: Levels of Consciousness

Freud proposed that the mind operates at three levels of awareness:

• The Conscious Mind: Contains thoughts, memories, feelings, and wishes of which we are aware at any given moment.
• The Preconscious Mind: Contains material that is not currently in awareness but can be easily retrieved and brought into consciousness (e.g., a phone number).
• The Unconscious Mind: A vast reservoir of feelings, thoughts, urges, and memories that are outside of conscious awareness. It contains unacceptable or unpleasant contents (pain, anxiety, conflict). Freud believed the unconscious is the primary determinant of behavior.

3.3.2 The Structural Model: Id, Ego, and Superego

When the ego is unable to manage the conflicting demands of the id, superego, and reality, anxiety results. The ego then employs defense mechanisms.

3.3.3 Defense Mechanisms

3.3.4 Psychosexual Stages of Development

3.3.5 The Oedipus and Electra Complexes

During the phallic stage, young boys experience the Oedipus complex — unconscious sexual desire for the mother and rivalry with the father (castration anxiety). Young girls experience the Electra complex — unconscious desire for the father and rivalry with the mother, complicated by penis envy.

3.5 Criticisms

• Lack of empirical support: Many concepts are difficult to test scientifically.
• Overemphasis on sexuality as a motivation.
• Determinism: Humans seen as driven by unconscious forces with limited free will.
• Gender bias in concepts like penis envy.

3.6 Clinical Relevance

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Chapter 4: Application of Schools of Thought to Health Care

4.1-4.11 Summary of Applications

• Idealistic Theory: Encourages a holistic vision (beyond surface symptoms) and informed self-management.
• Structuralism: Informs the systematic clinical history (breaking experience into quality, intensity, location) and element-by-element physical exams.
• Functionalism: Views symptoms as adaptive responses (e.g., fever as defense). Central to rehabilitation medicine and disability assessment.
• Humanism: Emphasizes empathy, unconditional positive regard, and patient autonomy. Maslow's hierarchy reminds clinicians to meet basic needs (nutrition, safety) before complex plans.
• Behaviourism: Uses operant conditioning for programs like smoking cessation and weight management. Classical conditioning explains iatrogenic illness (conditioned medical anxiety).
• Gestalt Theory: Informs holistic diagnosis ("the whole is greater than the sum of parts") and pattern recognition in radiology/dermatology.
• Evolutionary Theory: Explains diseases through the thrifty gene hypothesis (obesity/diabetes) and mismatch theory (ancestral adaptations vs. modern sedentary lifestyle).
• Cognitive Theory: First-line for CBT. Helps in presenting information within the limits of working memory capacity.
• Biological Theory: Foundational to psychopharmacology (neurotransmitter systems) and neurorehabilitation.

4.12 Integrated Summary Table

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Summary Tables and Key Points

Comparative Summary of Cognitive, Biological, and Psychodynamic Theories