Emotions
Administrative Logistics and Course Details
Final Examination Schedule and Location:
Date and Time: Scheduled for December 18 () from to .
Location: Upstairs in the current lecture building.
Curriculum Coverage: The examination is non-cumulative and evaluates only the material covered in the final third of the course.
Duration and Structure: Designed to take approximately , though students may utilize the full block if needed.
Grading Weight and Preparation:
Exam 1 carries less weight toward the final grade than Exam 2 and Exam 3.
Comprehensive study guides are distributed approximately one week prior to Exam 2 and Exam 3.
Post-Exam Grade Review Procedures:
Following Exam 1, an entire lecture period was allocated to review questions and contest grading points; this policy will also apply to Exam 2.
Because grades must be submitted immediately after the final exam period, a post-exam review session will occur immediately following the final exam once the last test is submitted.
If the examination room is unavailable due to back-to-back scheduling, an informal meeting will be held downstairs in the student lounge area.
Experimental Research on Food Advertising and Subconscious Priming
Study Design and Deception:
Sample Size: college students assigned across three distinct experimental cohorts.
Cover Story: Participants were informed the experiment investigated how watching a television comedy program affects emotional mood, requiring subsequent ratings of their mood.
True Objective: Parallel to prior research in children, the experiment examined how different television commercial content primes immediate dietary consumption.
Experimental Manipulation and Procedures:
Phase 1 (Exposure): Subjects viewed a television broadcast embedded with one of three advertisement conditions:
Snack food advertisements.
Nutritional/healthy food advertisements.
Control advertisements featuring non-food items.
Phase 2 (Food Consumption Task): Participants were escorted to separate testing rooms under the guise of an unrelated sensory rating experiment evaluating five distinct foods ranging across a healthiness spectrum:
Healthy foods: Celery and carrots.
Snack/junk foods: Potato chips and chocolate chip cookies.
Variables:
Independent Variable: Type of television commercial viewed (snack vs. nutritional vs. non-food control).
Dependent Variables: Total volume of food consumed and total time spent eating.
Experimental Findings:
General Consumption Effects: Participants exposed to snack advertisements consumed significantly more food overall and engaged in significantly longer eating durations compared to participants in the nutritional or non-food control conditions.
Non-Specificity of Food Selection: The elevated consumption induced by snack advertisements was not restricted to snack or junk foods; consumption increased across all five food categories, including healthy vegetables (carrots and celery).
Individual Differences: The priming effect was most pronounced among male participants and chronic dieters/restricted eaters (individuals actively attempting to limit their caloric intake), who consumed the greatest volume and ate for the longest duration.
Hunger Independence: Baseline and post-consumption self-reported hunger ratings displayed an absolute lack of correlation () with the amount of food consumed, establishing that food advertisements operate as an automatic, subconscious prime rather than a physiological hunger cue.
Student Presentation Opportunity (Trigger Warnings):
A student presentation was opened regarding a study evaluating the efficacy of trigger warnings in populations with a history of psychological trauma (analyzing whether warnings are beneficial or harmful).
The methodology was noted as containing a significant conceptual or design flaw for students to critically analyze.
Conceptual Foundations and Measurement of Emotion
Linguistic Prominence:
The English language—and human language in general—contains an exceptionally vast lexicon to delineate subtle emotional variations, reflecting the central importance of emotional states to human cognition.
William James on the Primacy of Emotion:
William James argued that stripping human consciousness of emotional resonance would render the universe entirely devoid of value, hierarchy, or meaning:
If an individual were suddenly stripped of all emotional experience, no single element or event in the universe would hold greater importance than another.
All objects and historical sequences would lack character, significance, expressive quality, or subjective perspective.
Emotional reactions dictate whether stimuli are classified as important, pleasant, or meaningful.
Historical Neglect in Empirical Psychology:
Despite widespread acknowledgment of its importance, psychological research into emotion remained virtually non-existent until the .
This historical omission resulted from methodological difficulties in accurately operationalizing, manipulating, and measuring internal affective states.
Modern psychology features numerous specialized, peer-reviewed academic journals centered exclusively on affective science.
Formal Definition of Emotion:
Emotions are biologically based responses to situations evaluated as personally relevant.
They are systematically shaped by environmental learning and associative conditioning.
They are characterized by coordinated changes across three components:
Peripheral Physiology: Autonomic shifts such as alterations in heart rate, skin conductance, or neuroendocrine release.
Expressive Behavior: Observable motor outputs including facial configurations, posture, and vocalizations.
Subjective Experience: Phenomenological feeling states ("what it feels like" to the individual).
Emotion Versus Mood:
Emotion: An immediate, intense, short-lived biological and psychological reaction elicited by a discrete external or internal trigger.
Mood: A diffused, long-lasting, low-intensity emotional background state that does not require a direct, immediate situational elicitor.
Dimensional Models of Emotion:
Theoretical modeling requires mapping affective experiences into a defined coordinate space.
A standard two-dimensional affective circumplex relies on:
Arousal/Intensity: Plotted on one axis representing low to high physiological activation.
Valence: Plotted on an orthogonal axis representing negative versus positive hedonic tone.
For a dimensional model to be valid, the axes must be mathematically orthogonal (statistically independent), and the continuous coordinate space must account for all possible human emotional experiences.
Phylogenetic Distribution (Non-Human Emotions):
Scientific consensus rejects human exceptionalism (the idea that only Homo sapiens experience emotions).
Primate comparative observation (e.g., chimpanzees) demonstrates overt emotional behavioral displays.
Observational evidence in non-human mammals, such as domestic dogs, reveals clear emotional responsiveness and behavioral parallels to human affect.
Theoretical Frameworks of Emotion and the Misattribution of Arousal
Common Sense Theory:
Sequential processing order: External Fearful Stimulus Subjective Feeling of Fear Autonomic Peripheral Physiological Response (e.g., elevated heart rate).
Subjective reasoning: "My heart is pounding because I feel afraid."
James-Lange Theory:
Sequential processing order: External Fearful Stimulus Peripheral Physiological Arousal/Somatic Motor Response Cognitive Interpretation/Subjective Emotional Experience.
William James asserted that physiological bodily events precede and cause emotional feelings:
"We feel sorry because we cry, angry because we strike, afraid because we tremble."
Subjective emotional labels function as after-the-fact rationalizations of somatic and motor states.
Empirical Support (Facial Feedback Hypothesis):
Participants held a pencil in their mouth either crosswise between their teeth (forcing contraction of the zygomaticus major, simulating a smile) or gripped with their lips pointing outward (preventing smiling muscles, forcing a pout/frown).
Participants in the teeth-holding (smiling) condition rated comedic films as significantly funnier, whereas participants in the lip-holding (frowning) condition rated sad stimuli as more intensely negative.
Philosophical/Applied Parallels:
A best-selling manual on managing negative affect by a Vietnamese Buddhist monk advocates deliberately smiling during severe emotional distress.
The behavior exploits somatic feedback loops: the physical act of smiling can initiate physiological shifts toward positive affect, while also triggering social smiling reciprocity from others.
Cannon-Bard Theory:
Proposes that an emotional stimulus triggers peripheral physiological responses and subjective conscious feelings simultaneously and independently.
Neither the somatic bodily state nor the conscious feeling causes the other; both are parallel outputs of subcortical processing.
Two-Factor Theory and Misattribution of Arousal:
Emotional experience emerges from an interaction between non-specific peripheral physiological arousal and a cognitive appraisal of the environmental context to explain that arousal.
Adrenaline (Epinephrine) Injection Studies:
Subjects received unlabelled injections of either adrenaline (which causes physiological arousal, rapid heart rate, and peripheral tremors) or an inert saline placebo.
When placed in situations with emotional confederates or evocative media, adrenaline-injected subjects interpreted their heightened autonomic arousal based on immediate external cues:
Reported greater terror during horror films.
Demonstrated heightened aggression and subjective anger when insulted by an experimental confederate.
Exhibited longer durations of laughter and amusement during comedy screenings.
Dutton and Aron (1974) "Creaky Bridge" Experiment:
Context: Tested at a canyon featuring two crossing options: a high, narrow, swaying suspension bridge ("Creaky Bridge") that elicited elevated heart rates and fear of heights; and a wide, stable, low bridge engineered to safely carry vehicular traffic.
Methodology: An attractive female experimental confederate stood on each bridge, intercepted unaccompanied male pedestrians, and requested their completion of a brief survey for a purported school project. Upon completion, she provided her personal telephone number, offering to answer further inquiries.
Hypothesis: Men on the dangerous bridge would experience elevated physiological arousal (autonomic fight-or-flight response) and misattribute their pounding hearts to romantic/sexual attraction to the female confederate.
Results: Significantly more men who were interviewed on the dangerous, swaying bridge telephoned the female confederate than men interviewed on the structurally secure bridge.
Critical Methodological Flaw: Selection bias due to lack of random assignment. Individuals who voluntarily opted to cross the dangerous suspension bridge may naturally possess higher sensation-seeking, risk-taking, or assertive traits, making them inherently more likely to initiate contact with an unfamiliar woman.
Subsequent Validations: Despite the selection bias flaw in the initial naturalistic experiment, controlled laboratory replications utilizing true random assignment verified the validity of the misattribution of arousal effect.
Integrated Synthesis: An emotion-inducing stimulus triggers non-specific peripheral bodily reactions; the brain rapidly assesses contextual and environmental circumstances; and this cognitive evaluation attributes the somatic arousal to a specific emotional category.
Universality, Cross-Cultural Display Rules, and Evolutionary Adaptations
Evolutionary Continuity (Charles Darwin):
Charles Darwin compared facial configurations across mammalian species and illustrated consistent anatomical patterns.
Darwin argued that universal expressive behaviors originated as functionally adaptive physical responses to environmental demands in ancestral species.
The Classical Six Basic Universal Emotions (Paul Ekman):
A decades-long dominant paradigm posited six discrete, culturally universal basic emotions: Happiness, Sadness, Fear, Anger, Surprise, and Disgust.
Evidence cited infant facial expressions, arguing that pre-linguistic infants display these specific configurations prior to social conditioning.
Contemporary Critiques (Lisa Feldman Barrett):
Infant facial dynamics are highly variable, continuous, and show dozens of motor expressions rather than six discrete configurations.
The classical taxonomy inappropriately restricts affective experience, omitting states that show cross-cultural consistency (e.g., sultry/sensual states).
Affective neuroscience increasingly views emotions as constructed, continuous mental phenomena rather than distinct biological modules.
Cross-Cultural and Innate Expression Studies:
Congenitally Blind Athletes:
High-speed photographic analyses during Olympic and Paralympic medal ceremonies compared athletes sighted since birth with athletes blind from birth (who had never observed a human face).
Congenitally blind medalists spontaneously displayed the exact same facial configurations as sighted athletes under equivalent conditions:
Gold medalists displayed maximal authentic smiles.
Bronze medalists displayed genuine smiles of relief/contentment.
Silver medalists frequently displayed tense, downward-turned, unhappy facial expressions reflecting the frustration of narrowly missing first place.
Cross-Cultural Facial Recognition Tasks:
Western and non-Western participants sorted unlabelled photographs of Western faces exhibiting affective displays into emotion categories.
If emotional expression were purely biological, classification accuracy would be identical across cultures; if entirely culturally constructed, non-Western sorting would drop to chance ( across six options).
Empirical data revealed a intermediate outcome: high global categorization agreement, but with systematic variance across cultural cohorts.
Cultural Display Rules:
Human emotion consists of a pan-cultural, universal biological expressive core modulated by culturally acquired rules governing when, where, and to whom specific displays may be shown.
Cross-Cultural Anecdote (Russian Display Rules): Russian academics (e.g., Yuri Petrov, Olga) noted that in traditional Russian culture, smiling is reserved exclusively for expressing authentic personal happiness or humor; it is not utilized as an empty social greeting. Smiling at unfamiliar colleagues in public hallways is often perceived as abnormal, vacant, or unprovoked.
Search for Unique Physiological Signatures:
Historically, mapping distinct emotions to discrete autonomic markers (e.g., classifying anger vs. fear purely by combining heart rate, galvanic response, and skin temperature) consistently failed.
The discipline remains partially in an exploratory "alchemy phase" regarding biological classification.
Modern research (e.g., Katie Oman's doctoral dissertation at Northeastern University) evaluates high-resolution micro-measures, including fine ocular motor patterns and nystagmus, suggesting that unique physiological biomarkers may exist if assessed beyond traditional gross autonomic indicators.
Behavioral Regulation and Evolutionary Utility of Facial Expressions:
The Visual Cliff Experiment (Social Referencing):
Infants crawl across an elevated glass apparatus with a visual cliff drop-off covered by transparent, weight-bearing plexiglass.
When mothers displayed an encouraging, joyful facial expression without speaking or gesturing, () of infants successfully crawled across the drop-off after tentative tactile testing.
When mothers displayed a fearful facial expression, of infants attempted to cross the visual drop-off, demonstrating that nonverbal emotional expressions regulate survival behaviors.
Adam Anderson’s Sensory Regulation Hypothesis:
Facial expressions evolved as functional optical and respiratory adaptations rather than arbitrary communicative displays:
Fear Configuration: Wide eye aperture (widened palpebral fissures) and flared nostrils physically maximize the visual field and optimize respiratory airflow to enhance sensory surveillance during environmental emergencies.
Disgust Configuration: Narrowed eye aperture and constricted nasal passages physically restrict sensory intake, protecting the ocular surface and upper respiratory tract from airborne pathogens or noxious substances.
Neural Architecture of Emotion: The Amygdala and Fear
Amygdalar Specialization:
The amygdala—a bilateral subcortical structure within the medial temporal lobes—is essential for processing environmental threat, fear conditioning, and fear appraisal.
Animal Lesion Studies:
Rodent Research: Rodents with bilateral surgical excision of the amygdala lose all fear-mediated avoidance. Lesioned rodents voluntarily approach, touch, and rub against anesthetized live cats and show no aversion to predatory feline odors, eliminating threat detection and drastically reducing survival.
Primate Social Hierarchies: Dominant male monkeys with bilateral amygdala lesions lose threat appraisal and social dominance, descending to subordinate rank upon return to their social troop.
Rhesus Macaque Behavioral Testing:
Normal controls approach novel environmental stimuli cautiously, while amygdala-lesioned macaques approach and manipulate unfamiliar objects without hesitation.
When presented with food positioned adjacent to a hyper-realistic rubber snake, intact control macaques hesitate for nearly a full minute () before feeding, whereas amygdala-lesioned subjects ignore the threat cue and immediately consume the food.
Human Fear Conditioning and Double Dissociations:
Investigated using galvanic skin response ( ) during classical fear conditioning paradigms where neutral stimuli (visual cues) are paired with aversive unconditioned stimuli (loud noises or electric shocks):
Intact Controls (): Exhibit robust physiological fear conditioning (elevated to conditioned stimuli) alongside conscious, explicit declarative memory of the pairing rules.
Bilateral Amygdala Lesion with Intact Hippocampus (): Exhibit zero physiological fear conditioning (flat ), yet retain perfect conscious declarative memory (accurately reporting that the image preceded an electric shock).
Intact Amygdala with Bilateral Hippocampal Lesion (): Exhibit robust physiological fear conditioning (autonomic preparation and elevated to the conditioned cue), but suffer complete declarative amnesia, unable to explicitly recall the association or recognize the experimental apparatus.
Bilateral Lesions of Amygdala and Hippocampus (): Exhibit neither physiological conditioned fear nor explicit declarative memory of the contingency.
Affective Memory Consolidation:
The amygdala enhances long-term memory encoding for emotionally arousing experiences.
In three-part narrative recall tests (featuring neutral beginnings, emotionally traumatic middle sections, and neutral conclusions), neurotypical individuals demonstrate a significant memory enhancement for the emotionally intense middle section when tested one week later.
Patients with bilateral amygdala lesions display equivalent memory across all three sections, showing no emotional memory enhancement for the traumatic narrative content.
Subliminal and Subcortical Visual Processing:
Recognition Deficits: Individuals with amygdala pathology reliably misclassify fearful facial expressions as emotionally neutral.
Backward Masking Paradigms: In neurotypical brains, fearful faces presented subliminally (briefly flashed and instantly masked below conscious awareness) evoke significant amygdalar activation relative to neutral or happy faces.
Blindsight (Cortical Blindness): Patients with unilateral primary visual cortex () lesions who are consciously blind in their contralateral hemifield show selective amygdala activation when fearful faces are presented entirely within their blind field, confirming an intact subcortical collicular-pulvinar pathway for rapid threat detection.
Neural Bases of Disgust and Contemporary Affective Challenges
The Insular Cortex and Disgust:
Just as the amygdala is linked to fear, the anterior insula is linked to processing disgust.
Surgical or ischemic lesions to the insular cortex impair the physiological experience of disgust.
Patients with insular damage are selectively impaired in identifying disgust facial configurations in others.
Both the amygdala and insula perform additional cognitive and somatic functions beyond fear and disgust.
Asymmetries in Affective Neuroscience:
Affective neuroscience has isolated discrete subcortical circuits for survival-critical negative emotions (fear in the amygdala, disgust in the insula).
No single primary brain structure has been isolated as a dedicated center for positive emotions such as happiness, or for sadness.
This asymmetry suggests that happiness may represent a distributed, multi-network affective state rather than an encapsulated basic emotion, or that classical models have yet to uncover the neural architecture underlying positive valence.
Questions & Discussion
Inquiry Regarding Food Priming Hypotheses:
Question: Was there an established scientific hypothesis explaining why exposure to snack ads elevated the consumption of all foods (including vegetables) rather than only junk foods?
Clarification: The study lacked a formal pre-registered hypothesis for this broad cross-category increase. A plausible explanation is that snack advertisements prime a general appetitive state through learned reward associations ("I like this, this tastes good"). This elevates eating motivation rather than homeostatic physiological hunger, leading participants to consume whatever food is accessible.
Inquiry Regarding Age-Group Gender Discrepancies:
Question: Did the children cohort demonstrate the same gender-based consumption differences (men consuming the most) seen in the adult college student cohort?
Clarification: The gender divergence was specifically recorded within the adult demographic analysis.
Inquiry on Cultural Norms Surrounding Smiling:
Question: Are there Russian native speakers present in the room who can empirically confirm or deny the cultural display rule that smiling is strictly reserved for genuine amusement rather than standard greetings?
Clarification: The inquiry was met with silence, leaving the display rule assertion based on the anecdotal account provided by Russian vision researchers.