Chapter 7: Motivation and Emotion – What Moves Our Behavior?

Motivation and Emotion

Introduction

This chapter explores the psychological processes that activate, direct, and sustain behavior, focusing on the concepts of motivation and emotion. Understanding these processes helps explain why we act, feel, and respond in particular ways.

• Motivation: Forces that activate and direct behavior toward goals.

• Emotion: A complex internal state involving physiological, cognitive, and behavioral components.

• "Movere" (Latin): The root of "motivation," meaning "to move."

Instincts and Motivation

How Instincts Motivate Behavior

Instincts are innate tendencies that drive behavior without prior learning. They are studied through evolutionary psychology and ethology.

• Evolutionary psychology: Explains behavior by focusing on its function or purpose in adaptation.

• Ethology: The scientific study of animal behavior, often in natural environments.

Types of Instinctive Behaviors

• Unlearned behavior: Present from early age, requires little to no experience.

• Reflex: Automatic, unlearned response to a stimulus (e.g., rooting reflex in infants).

• Modal action patterns: Common behavioral patterns in response to specific stimuli (e.g., goose egg rolling, courtship dances in birds).

Examples of Modal Action Patterns

• Goose egg rolling

• Rooster courtship dance

• Gulls pecking

• Rooting reflex (infants)

• Grasping reflex (infants)

Internal Factors: Drives

How Internal Factors Motivate Behavior

Drives are internal states that push individuals to act in ways that restore balance or homeostasis.

• Drive: An internal force that energizes behavior to reduce physiological needs.

• Drive-reduction theory: Behavior is motivated by the desire to reduce internal tension caused by unmet needs.

• Homeostasis: The body's tendency to maintain equilibrium or balance.

Example: Hunger motivates eating; eating reduces hunger and restores homeostasis.

External Factors: Incentives

How External Goals Motivate Behavior

Incentives are external cues that pull behavior toward specific goals.

• Incentives: External stimuli that motivate behavior (e.g., rewards, grades, money).

• Reinforcement: Increases the probability of repeating a behavior.

• Punishment: Decreases the probability of repeating a behavior.

• The quantity and quality of reinforcement/punishment affect the intensity of motivation.

Example: Receiving praise for good grades increases motivation to study.

Arousal and Motivation

How Arousal Motivates Behavior

Arousal refers to the level of alertness, interest, or excitement. Optimal arousal is necessary for peak performance.

• Reticular formation: Brain structure involved in regulating attention, arousal, and sleep.

• Sympathetic nervous system: Part of the autonomic nervous system that activates the fight-or-flight response.

Yerkes-Dodson Arousal Curve

The Yerkes-Dodson Law describes the relationship between arousal and performance as an inverted-U curve:

• Low arousal: Poor performance due to lack of motivation.

• Optimal arousal: Best performance.

• High arousal: Poor performance due to stress or anxiety.

$Performance = f(Arousal)$

Arousal homeostasis: Striving to maintain an optimal level of arousal for best functioning.

Regulation of Eating Behavior

How Do I Know When, What, and How Much to Eat?

Eating behavior is regulated by physiological mechanisms that maintain energy balance and body weight.

• Homeostasis: Physiological tendency to maintain equilibrium.

• Set point: The body tries to maintain its weight within a certain range.

Physiological Components of Weight Management

• Hunger: Desire to eat.

• Satiety: Feeling of fullness.

• Basal metabolic rate (BMR): Amount of energy the body consumes at rest.

• Body fat: How our bodies store energy.

Internal Signals Regulating Feeding

• Hypothalamus: Brain structure that regulates eating behavior.

• Insulin: Hormone released by the pancreas; high levels suppress appetite.

• Leptin: Hormone released by fat cells; high levels suppress appetite.

Example: Ob/ob mice lack leptin and become obese; leptin administration reduces their appetite.

External Influences on Eating Behavior

What Else Influences My Eating Behavior?

Eating is also influenced by external signals, including environmental cues and learned associations.

• Environmental cues: Time of day, availability of food, social context.

• Classical conditioning: Cues associated with food (e.g., smell) can trigger eating.

• Operant conditioning: Foods can act as incentives; palatability (tastiness) increases motivation to eat.

Example: Smelling popcorn at a movie theater may trigger eating even if not hungry.

Summary Table: Key Concepts in Motivation and Emotion

Concept	Definition	Example
Motivation	Forces that activate and direct behavior	Studying for an exam
Emotion	Internal state with physiological, cognitive, and behavioral components	Feeling anxious before a test
Instinct	Innate tendency driving behavior	Rooting reflex in infants
Drive	Internal push to restore homeostasis	Hunger leading to eating
Incentive	External pull toward a goal	Working for a paycheck
Arousal	Level of alertness or excitement	Optimal arousal for test performance
Homeostasis	Maintaining physiological balance	Regulating body temperature
Classical Conditioning	Learning via association	Eating when smelling food
Operant Conditioning	Learning via consequences	Eating dessert as a reward