Motivation and Emotion: Key Concepts and Theories

Motivation and Emotion

Motivation

Motivation refers to the physiological and psychological processes that initiate behaviors directed toward specific goals. It is essential for survival, as it helps maintain homeostasis by driving organisms to fulfill their needs.

• Drive: A biological trigger indicating deprivation, prompting the organism to seek what is needed (e.g., hunger, thirst).

• Incentives: External stimuli that motivate behavior to reduce drives (e.g., food, water, social interaction).

• Motives: Can be physiological (e.g., drinking when thirsty) or psychological (e.g., seeking companionship when lonely).

• Goal-Directed Behavior: Behaviors are initiated to achieve specific outcomes or satisfy needs.

Physiological Aspects of Hunger

Hunger is regulated by complex interactions between the brain and hormones.

• Hypothalamus: Detects changes in blood glucose and acts as an on/off switch for hunger.

  • Lateral hypothalamus: Initiates eating ("go" signal).

  • Ventromedial hypothalamus: Inhibits eating ("stop" signal).

  • Injury: Damage to these areas can drastically alter eating behavior.

• Hormones:

  • Ghrelin: Produced in the stomach, increases appetite; levels drop after gastric bypass surgery.

  • Leptin: Produced by fat cells, signals satiety and reduces hunger.

  • Insulin: Secreted by the pancreas, regulates blood sugar and satiety.

• Ozempic (GLP-1 agonist): Mimics the GLP-1 hormone, reducing hunger and cravings, slowing gastric emptying, and making eating less rewarding.

Food and Reward

The brain's reward system is activated by food, especially highly palatable foods.

• Cingulate Cortex: Activated by fat receptors on the tongue, linking taste and texture to emotional reward.

• Dopamine Release: Highly palatable foods trigger dopamine, reinforcing eating behaviors.

Eating and Cognition

Cognitive factors influence eating behavior, including portion control and unit bias.

• Unit Bias: The tendency to assume a single unit or portion is the appropriate amount to consume.

• Portion Sizes: Portion sizes have increased over time, contributing to overeating.

Eating and Social Context

Social and environmental factors play a significant role in eating behavior.

• Social Facilitation: People tend to eat more in groups.

• Impression Management: People may eat less to manage others' perceptions.

• Modeling: Individuals often mimic the eating behaviors of those around them.

• Cultural Norms: Preferences, habits, and societal rules influence what, when, and how much people eat.

• Food-Related Cues: Appearance, odor, and effort required to obtain food affect eating.

• Stress: Heightened arousal and negative emotions can lead to overeating ("stress-eating").

Culture and Food: Cross-Cultural Comparisons

Culture shapes eating habits, portion sizes, and social norms around food.

• Philadelphia vs. Paris (Rozin et al., 2003):

  • Portion sizes in Philadelphia are 25% larger in restaurants and 41% larger for items like candy bars compared to Paris.

  • Time spent eating at McDonald's: Philadelphia (M=14.4 min), Paris (M=22.2 min).

  • Obesity rates: Americans are three times more likely to be obese than the French.

• Italy: Eating is social, with limited take-out options and specific foods reserved for certain times. Weekly markets emphasize seasonal foods.

Obesity: Causes and Trends

Obesity rates have risen rapidly due to environmental and lifestyle changes.

• Adult obesity in Canada nearly doubled from 1978 to 2005; over 63% of Canadians over 18 are overweight.

• Contributing factors:

  • Abundance of low-cost, high-fat foods

  • Eating on the run

  • Energy-saving devices (cars, remotes)

  • Leisure activities that reduce physical activity

Belongingness and Love Needs

The Need to Belong

Belongingness is a fundamental human need, crucial for physical and mental well-being.

• Motivation: To maintain warm, affectionate, mutually caring relationships.

• Permanence: Stable, enduring relationships matter more than frequent, superficial interactions.

• Health Effects: Social connectedness predicts better health; loneliness is linked to hypertension, weakened immunity, elevated stress hormones, and reduced life expectancy.

Technology and Belongingness

Technology can both foster and challenge social connections.

• Creates global communities (e.g., BookTok).

• May isolate individuals from local, face-to-face relationships.

Love

Love is a complex emotional experience with different forms.

• Passionate Love: Characterized by physical attraction, sexual desire, and intense longing ("honeymoon stage").

• Compassionate Love: Involves tenderness, affection, commitment, and enduring partnership.

Emotions

Understanding Emotional Experiences

Emotions are mental states or feelings associated with our evaluation of experiences. They involve arousal, facial and body changes, brain activation, cognitive appraisals, subjective feelings, and tendencies toward action, all shaped by cultural rules.

• Cognitive Component: Subjective, conscious experience of emotion.

• Physiological Component: Bodily arousal (e.g., heart rate, sweating).

• Behavioral Component: Overt expressions (e.g., facial expressions, gestures).

Functions of Emotions

• Prepare us for action (linking events to responses).

• Shape future behavior (reinforcement or punishment).

• Facilitate social interaction (signal to others).

Labelling Emotions

• Basic emotions: happiness, anger, fear, sadness, disgust.

• Cultural differences exist in emotional descriptions (e.g., Hagaii, Musu).

Emotional Expression: Innate and Universal

• Darwin: Emotional expressions are universal and biologically based.

• Evidence: Social smiles emerge at similar ages in sighted and blind infants; monozygotic twins more similar in fear responses than dizygotic twins; cross-cultural similarities in distress at separation from mother.

Primary Emotions

• Paul Ekman identified six basic emotions recognized worldwide: happiness, anger, fear, sadness, disgust, surprise.

• These emotions are biologically hardwired, not learned.

• Microexpressions: Brief, involuntary facial expressions that may reveal concealed emotions.

Facial Cues to Deception

• Liar's stereotype: Belief that liars show specific facial and behavioral cues (e.g., gaze aversion, raised eyebrows, pursed lips).

• Microexpressions may reveal deception, but evidence is debated.

Culture and Emotions

• Culture shapes emotional experiences and expression.

• Display rules: Cultural norms governing how emotions are expressed (e.g., Japan suppresses negative emotions in public; US expresses emotions more freely).

Theories of Emotion

Several theories explain the relationship between physiological responses and subjective feelings.

1. James-Lange Theory: Bodily reactions occur first, followed by emotional experience.

   • Physical events are interpreted by the brain as emotions.

   • Example: "My heart is pounding, so I must be scared."

2. Cannon-Bard Theory: Emotions and physiological reactions occur simultaneously and independently.

   • Thalamus sends signals to the amygdala and autonomic nervous system, producing both emotional and physical responses.

3. Schachter-Singer Two-Factor Theory: Emotion arises from physiological arousal and cognitive interpretation.

   • General arousal is cognitively assessed, leading to subjective feelings.

   • Example: Capilano bridge study—misattribution of arousal.

Facial Feedback Hypothesis

• Facial muscle activity influences emotional experience.

• Strack et al. (1988): Pencil between lips or teeth affected perceived funniness of cartoons.

• Wagenmakers et al. (2016): Failed to replicate the effect in 17 studies.

Botox and Reading Emotions

• Botox paralyzes facial muscles, reducing ability to express and identify emotions.

• Research: Botox-treated participants performed worse at identifying emotions than those with dermal fillers.

Theory of Constructed Emotion

• Lisa Feldman Barrett: Emotions are concepts constructed by the brain, based on bodily sensations, past experiences, and cultural context.

• Example: Two people at a wedding may interpret similar bodily sensations differently depending on cultural background.

Summary Table: Theories of Emotion

Theory	Main Idea	Key Components	Example
James-Lange	Body reacts first, emotion follows	Physiological arousal, then emotional experience	"I tremble, therefore I am afraid."
Cannon-Bard	Body and emotion occur together	Simultaneous physiological and emotional response	"I tremble and feel afraid at the same time."
Schachter-Singer	Body + brain = emotion	Physiological arousal + cognitive interpretation	"My heart races, I label it as attraction."
Theory of Constructed Emotion	Emotions are concepts constructed by the brain	Bodily sensations, past experience, culture	Different interpretations of the same event

Key Equations and Concepts

• Body Mass Index (BMI): Used to classify overweight and obesity. $\mathrm{BMI} = \frac{\mathrm{weight\ (kg)}}{\mathrm{height\ (m)}^2}$

Additional info: Some explanations and examples have been expanded for clarity and completeness, including definitions, applications, and research findings.