Reinforcement Sensitivity Theory (RST) Comprehensive Study Guide

Introduction and Overview of Reinforcement Sensitivity Theory

• Context within Personality Theory: Reinforcement Sensitivity Theory (RST) is a biological approach to personality, contrasted with the purely descriptive trait approach (such as the Big Five or Five Factor Model).

• Limitations of Descriptive Approaches: The Big Five approach describes personality but, until recently, did not offer causal explanations for traits.

• Biological Basis Advantages: Biological models like RST aim to identify the underlying sources or biological systems that drive observable behavioral traits.

• Core Concept: RST explores individual differences by examining how people respond to reward and punishment rather than describing them through high-level traits like extraversion or neuroticism.

• Applications of RST:
      * Understanding psychopathology and addiction.
      * Analyzing behaviors related to COVID-$19$ self-isolation directives.
      * Examining academic integrity, such as why certain students cheat on university assessments.

• Resource Limitations: RST receives minimal attention in standard textbooks (e.g., it is only briefly mentioned in the Funder text). It is a complex theory combining biology, learning theory, and behavioral theory.

The Profile of Jeffrey Gray and the Origins of RST

• Proposer: Professor Jeffrey Gray proposed the original theory in $1970$.

• Academic and Professional Background:
      * Born in London; passed away in $2004$.
      * A gifted linguist who served in the military during the $1950 ext{s}$, where he learned Russian. He also learned Persian through his wife and was fluent in multiple other languages.
      * Earned multiple undergraduate degrees in psychology and a PhD from the Institute of Psychiatry in London.

• Connection to Hans Eysenck: Gray worked under Hans Eysenck, who was the head of the department at the Institute of Psychiatry. This relationship is compared to the way Raymond Cattell worked as a research assistant to Charles Spearman.

• Empirical Origins: Unlike other trait theorists, Gray’s theory was fundamentally rooted in research on the neurobiology of anxiety in rodents.

Historical Eras of RST: Original vs. Revised Model

• Original RST ($1970$ – $1980 ext{s}$): Founded on two primary systems:
      1. Behavioral Approach System (BAS): Often equated with Reward Sensitivity.
      2. Behavioral Inhibition System (BIS): Often equated with Punishment Sensitivity.

• The Rotation of Dimension: Gray did not accept Eysenck’s dimensions of Neuroticism (N) and Extraversion (E) as the primary axes. Instead, he rotated Eysenck’s axes by $45$ degrees.
      * BIS Position: Located close to neuroticism but within the introversion quadrant of Eysenckian space.
      * BAS Position: Leans toward extraversion but occupies the higher-than-average neuroticism space.

• Axis Properties: Like Eysenck’s model, these dimensions are orthogonal ($90$ degrees apart), meaning they are statistically independent.

• The Revision ($2000$): Jeffrey Gray and Neil McNaughton (University of Otago) published a major revision in $2000$.
      * Reason for Change: Data from experiments testing reward/punishment sensitivities did not always support the original model, and advances in neuroimaging provided new insights.
      * Structural Change: The revised theory moved from two systems to three: the BAS, the FFFS, and a redefined BIS.

The Behavioral Approach System (BAS): Reward Sensitivity

• Definition: A conceptual motivational system reflecting individual differences in sensitivity to conditioned and unconditioned appetitive stimuli.

• Appetitive Stimuli Examples:
      * Unconditioned (Natural): Eating tasty food, falling in love.
      * Conditioned (Learned): Money (which is plastic/paper without inherent value until learned), or McDonald’s television advertisements that elicit cravings through association.

• Trait Distribution: BAS sensitivity is normally distributed across the population.

• Incentive Motivation: Characterized as "reward drive" or a "go for it" system. Leading researcher Philip Corr refers to the pursuit of positive goals as seeking "attractors."

• Wanting vs. Liking: RST focuses on the incentive to seek rewards (wanting/drive) rather than the actual pleasure experienced upon receiving them (liking).

• Academic Application: University students typically score higher on self-report BAS measures than the general population, indicating a strong drive toward abstract, future goals (a degree).

Components and Steps of the BAS Process

• Sub-goal Scaffolding Hypothesis (Corr, $2008$): Proposes that the BAS drives organisms toward a goal via a "temporospatial gradient" (moving through time and space toward a goal).

• The Three-Step Process:
      1. Identify the appropriate goal.
      2. Engage in planning behavior to obtain the goal.
      3. Execute the plan.

• Goal Tensions: Motivational systems help resolve tensions between long-term goals (studying for a degree) and immediate rewards (going to a party or taking a nap).

• The RST Personality Questionnaire (RSTPQ): Developed by Philip Corr and Andy Cooper. It identifies four specific subscales/dimensions of the BAS:
      1. Reward Interest: Tendency to notice and seek rewarding situations.
      2. Goal Drive Persistence: Continued effort and persistence to attain a reward.
      3. Reward Reactivity: Positive response to the actual attainment of rewards.
      4. Impulsivity: Engaging in risky and unplanned behaviors.

• Future vs. Now BAS:
      * Future BAS: Reward Interest and Goal Drive Persistence (linked to favorable outcomes).
      * Now BAS: Reward Reactivity and Impulsivity (impulsivity is often linked to less desirable outcomes).

The Fight-Flight-Freeze System (FFFS): Threat Detection

• Purpose: Regulates "defensive avoidance" to get away from a threat.

• Associated Emotions: Fear and Panic. Hypersensitivity in this system is linked to panic disorders.

• Psychological Proximity: In humans, the "distance" to a threat can be psychological/temporal rather than physical.
      * Example: An assignment due in $6$ weeks. A person with high threat sensitivity perceives the threat as "close" now and stresses immediately. A person with low sensitivity only feels the "proximity" of the threat (stress) the day before it is due.

The Behavioral Inhibition System (BIS): Conflict Sensitivity

• Definition: Often called the "watch out" system. It is activated when there is a conflict between competing goals (e.g., Reward vs. Threat).

• Conflict Types:
      1. Approach-Avoidance (Most Common): Wanting to go on an overseas trip (BAS reward) but fearing flying or border closures (FFFS threat). This results in "defensive approach"—you proceed but with high anxiety and vigilance.
      2. Approach-Approach: Choosing between two appealing options (e.g., two different cars). Choosing one means losing the other.
      3. Avoid-Avoid: Choosing between two aversive options (e.g., studying for an exam vs. writing an assignment). Avoiding one provides a relief-based reward.

• Consequences of BIS Activation: Increased arousal, heightened vigilance (e.g., double-checking passports, arriving at the airport $3$ to $4$ hours early), and the emotion of Anxiety.

• Pathology: Individuals high in BIS sensitivity are prone to general anxiety issues.

Biological and Neurobiological Underpinnings

• BAS Biological Basis:
      * Dopamine: Linked to seeking out rewards and appetitive stimuli ($ext{mesolimbic dopaminergic circuits}$).
      * Opioid System: Linked to responding to/experiencing the reward once obtained.

• FFFS and BIS Biological Basis:
      * Amygdala: Associated with emotion, fear, anxiety, and the assessment of both threat and reward.

• Connection to Eysenck’s Traits: There are strong links between Neuroticism and both the FFFS and BIS systems.

Research Legacy and Contemporary Connections

• Academic Lineage: Jeffrey Gray supervised Sharon Dawe (Professor at Griffith University) and Philip Corr. Matt Gullo (Associate Professor at Griffith) was a student of Sharon Dawe. This creates a "research family tree" where Gray is the "research grandfather" to current Griffith researchers.

• Key Text: Gray and McNaughton ($2000$) wrote a definitive, dense text on the neuroscience of anxiety, though it is described as exceptionally difficult to read for undergraduates.