Lecture 14: Motivation & Emotion – Study Notes for Introductory Psychology

Motivation & Emotion

Introduction

This study guide summarizes key concepts from a lecture on Motivation and Emotion in psychology. It covers biological and psychological processes underlying motivation, the regulation of hunger and eating, sexual motivation, social and achievement motivation, and major theories of emotion.

Motivation

Definition and Key Concepts

• Motivation: Physiological and psychological processes that underlie the initiation of behaviors directed toward specific goals.

• Homeostasis: The body's physiological processes that maintain consistent internal states (e.g., temperature, energy balance).

• Drives: Biological motives (e.g., hunger, thirst) that push behavior; often contrasted with incentives (external rewards).

• Allostasis: Motivation influenced by current needs and anticipation of future needs, often in response to stress.

Hunger & Eating

Biological Regulation of Hunger

• Hypothalamus: Brain region critical for hunger regulation.

  • Lateral hypothalamus: Triggers hunger ('on' switch).

  • Ventromedial hypothalamus: Suppresses hunger ('off' switch).

  • Paraventricular nucleus: Modulates the activity of lateral hypothalamus.

• Satiation: Feeling of fullness; regulated by hormones such as cholecystokinin (CCK).

• Unit bias: Tendency to assume a single unit/portion is the appropriate amount to consume.

• Social influences: Eating can be affected by social facilitation, impression management, and modeling.

Eating Disorders

• Anorexia nervosa: Pursuit of thinness via starvation; can be fatal.

  • Criteria: Weight < 85% of normal for age/height, fear of gaining weight, distorted body image, amenorrhea (loss of menstruation).

• Bulimia nervosa: Binge eating followed by purging (at least twice a week for 3 months).

  • Most (~70%) recover.

  • Criteria: Eating large amounts in a specific time, lack of control over eating (impulsive behavior).

Sex

Sexual Motivation and Influences

• Libido: Motivation for sexual activity and pleasure.

• Evolutionary influences: Includes intrasexual (within-sex) and intersexual (between-sex) selection; desirable traits in humans may include social status, resources, and willingness to enter a relationship.

• Psychological influences: Social and cultural factors, personal values, and experiences.

• Physiological influences: Hormones and brain structures (e.g., hypothalamus, pituitary gland, oxytocin).

• Sexual response cycle: Sequence of physiological changes during sexual activity.

Sexual Orientation & Transgender Individuals

• Sexual orientation: Consistent preference for sexual relations with members of the opposite sex, same sex, or either sex.

• Debates about the origins of same-sex behavior (e.g., biological, genetic, prenatal hormone influences, social factors).

• Research on brain differences (e.g., hypothalamic nuclei) and prenatal testosterone.

• Transgender: Individuals who experience a mismatch between their gender identity and biological sex.

Social & Achievement Motivation

The Need to Belong

• Maslow's hierarchy of needs: Proposes that some needs (e.g., physiological, safety) are more fundamental than others (e.g., esteem, self-actualization).

• Affiliation motivation: The need to maintain relationships involving pleasant feelings (warmth, affection, appreciation, mutual concern for well-being).

• Effects on mental and physical health: Loneliness is linked to negative health outcomes, including heart attacks.

Achievement Motivation

• Definition: The drive to perform at high levels and accomplish significant goals.

• Approach goals: Pursuit of enjoyable or pleasant incentives.

• Avoidance goals: Efforts to avoid unpleasant outcomes.

• Self-determination theory: Emphasizes universal needs for relatedness, autonomy, and competence.

• Self-efficacy: Confidence in one's ability to plan and execute a course of action to solve a problem.

• Sources of motivation: Intrinsic (mastery, interest) vs. extrinsic (performance, rewards).

• Praise and cheating: Overemphasis on performance praise can promote unethical behavior (see Zhu et al., 2017).

Emotion

Physiological Response

• Emotion: A behavior with a subjective thought/experience, a pattern of neural activity/physiological arousal, and an observable expression.

• Amygdala: Key brain structure in emotional processing, especially fear.

• Autonomic Nervous System (ANS): Regulates physiological arousal during emotional responses.

• Emotional regulation: Processes involved in managing and modifying emotional reactions.

Theories of Emotion

• James-Lange theory: Physiological arousal precedes emotional experience.

  • "We feel afraid because we tremble."

• Cannon-Bard theory: Emotional experience and physiological arousal occur simultaneously but independently.

• Facial feedback hypothesis: Facial expressions can influence emotional experiences.

• Two-factor theory (Schachter-Singer): Emotion is determined by physiological arousal and cognitive interpretation of that arousal.

• Experimental groups: Informed, ignorant, misinformed, and control groups are used to study the effects of arousal and cognition on emotion.

Summary Table: Major Theories of Emotion

Theory	Main Idea	Key Evidence
James-Lange	Physiological arousal leads to emotion	Facial feedback studies
Cannon-Bard	Emotion and arousal occur simultaneously	Brain lesion studies
Two-factor	Arousal + cognitive label = emotion	Schachter & Singer (1962) experiment

Key Equations and Concepts

• Homeostasis equation: $\text{Set Point} - \text{Current State} = \text{Drive}$

• Two-factor theory: $\text{Emotion} = \text{Arousal} + \text{Cognitive Label}$

Example

• Example of Two-Factor Theory: If your heart races after narrowly avoiding a car accident, you may label the arousal as "fear" based on the context, resulting in the emotional experience of fear.

Additional info: Some content was expanded for clarity and completeness based on standard introductory psychology textbooks.