Emotion classification

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Emotion classification, the means by which one may distinguish or contrast one emotion from another, is a contested issue in emotion research and in affective science. Researchers have approached the classification of emotions from one of two fundamental viewpoints:

  1. that emotions are discrete and fundamentally different constructs
  2. that emotions can be characterized on a dimensional basis in groupings

Emotions as discrete categories[edit]

In discrete emotion theory, all humans are thought to have an innate set of basic emotions that are cross-culturally recognizable. These basic emotions are described as "discrete" because they are believed to be distinguishable by an individual's facial expression and biological processes.[1] Theorists have conducted studies to determine which emotions are basic. A popular example is Paul Ekman and his colleagues' cross-cultural study of 1992, in which they concluded that the six basic emotions are anger, disgust, fear, happiness, sadness, and surprise. Ekman explains that there are particular characteristics attached to each of these emotions, allowing them to be expressed in varying degrees. Each emotion acts as a discrete category rather than an individual emotional state.[2]

Basicality debate[edit]

Humans' subjective experience is that emotions are clearly recognizable in ourselves and others. This apparent ease of recognition has led to the identification of a number of emotions that are said to be basic, and universal among all people. However, a debate among experts has questioned this understanding of what emotions are. There has been recent discussion of the progression on the different views of emotion over the years.[3]

On "basic emotion" accounts, activation of an emotion, such as anger, sadness, or fear, is "triggered" by the brain's appraisal of a stimulus or event with respect to the perceiver's goals or survival. In particular, the function, expression, and meaning of different emotions are hypothesized to be biologically distinct from one another. A theme common to many basic emotions theories is that there should be functional signatures that distinguish different emotions: we should be able to tell what emotion a person is feeling by looking at his or her brain activity and/or physiology. Furthermore, knowledge of what the person is seeing or the larger context of the eliciting event should not be necessary to deduce what the person is feeling from observing the biological signatures.[2]

On "constructionist" accounts, the emotion a person feels in response to a stimulus or event is "constructed" from more elemental biological and psychological ingredients. Two hypothesized ingredients are "core affect" (characterized by, e.g., hedonic valence and physiological arousal) and conceptual knowledge (such as the semantic meaning of the emotion labels themselves, e.g., the word "anger"). A theme common to many constructionist theories is that different emotions do not have specific locations in the nervous system or distinct physiological signatures, and that context is central to the emotion a person feels because of the accessibility of different concepts afforded by different contexts.[4]

Semantically distinct emotions[edit]

Eugene Bann proposed a theory that people transmit their understanding of emotions through the language they use that surrounds mentioned emotion keywords. He posits that the more distinct language is used to express a certain emotion, then the more distinct the perception (including proprioception) of that emotion is, and thus more basic. This allows us to select the dimensions best representing the entire spectrum of emotion. Coincidentally, it was found that Ekman's (1972) basic emotion set, arguably the most frequently used for classifying emotions, is the most semantically distinct.[5]

Dimensional models of emotion[edit]

For both theoretical and practical reasons researchers define emotions according to one or more dimensions. in his philosophical treatise, The Passions of the Soul, Descartes defines and investigates the six primary passions (wonder, love, hate, desire, joy, and sadness). Wilhelm Max Wundt, the father of modern psychology, proposed in 1897 that emotions can be described by three dimensions: "pleasurable versus unpleasurable", "arousing or subduing" and "strain or relaxation".[6] In 1954 Harold Schlosberg named three dimensions of emotion: "pleasantness–unpleasantness", "attention–rejection" and "level of activation".[7]

Dimensional models of emotion attempt to conceptualize human emotions by defining where they lie in two or three dimensions. Most dimensional models incorporate valence and arousal or intensity dimensions. Dimensional models of emotion suggest that a common and interconnected neurophysiological system is responsible for all affective states.[8] These models contrast theories of basic emotion, which propose that different emotions arise from separate neural systems.[8] Several dimensional models of emotion have been developed, though there are just a few that remain as the dominant models currently accepted by most.[9] The two-dimensional models that are most prominent are the circumplex model, the vector model, and the Positive Activation – Negative Activation (PANA) model.[9]

Circumplex model[edit]

The circumplex model of emotion was developed by James Russell.[10] This model suggests that emotions are distributed in a two-dimensional circular space, containing arousal and valence dimensions. Arousal represents the vertical axis and valence represents the horizontal axis, while the center of the circle represents a neutral valence and a medium level of arousal.[9] In this model, emotional states can be represented at any level of valence and arousal, or at a neutral level of one or both of these factors. Circumplex models have been used most commonly to test stimuli of emotion words, emotional facial expressions, and affective states.[11]

Russell and Lisa Feldman Barrett describe their modified circumplex model as representative of core affect, or the most elementary feelings that are not necessarily directed toward anything. Different prototypical emotional episodes, or clear emotions that are evoked or directed by specific objects, can be plotted on the circumplex, according to their levels of arousal and pleasure.[12]

Vector model[edit]

The vector model of emotion appeared in 1992.[13] This two-dimensional model consists of vectors that point in two directions, representing a "boomerang" shape. The model assumes that there is always an underlying arousal dimension, and that valence determines the direction in which a particular emotion lies. For example, a positive valence would shift the emotion up the top vector and a negative valence would shift the emotion down the bottom vector.[9] In this model, high arousal states are differentiated by their valence, whereas low arousal states are more neutral and are represented near the meeting point of the vectors. Vector models have been most widely used in the testing of word and picture stimuli.[11]

Positive activation – negative activation (PANA) model[edit]

The positive activation – negative activation (PANA) or "consensual" model of emotion, originally created by Watson and Tellegen in 1985,[14] suggests that positive affect and negative affect are two separate systems. Similar to the vector model, states of higher arousal tend to be defined by their valence, and states of lower arousal tend to be more neutral in terms of valence.[9] In the PANA model, the vertical axis represents low to high positive affect and the horizontal axis represents low to high negative affect. The dimensions of valence and arousal lay at a 45-degree rotation over these axes.[14]

Plutchik's model[edit]

Robert Plutchik offers a three-dimensional model that is a hybrid of both basic-complex categories and dimensional theories. It arranges emotions in concentric circles where inner circles are more basic and outer circles more complex. Notably, outer circles are also formed by blending the inner circle emotions. Plutchik's model, as Russell's, emanates from a circumplex representation, where emotional words were plotted based on similarity.[15] There are numerous emotions, which appear in several intensities and can be combined in various ways to form emotional "dyads".[16][17][18][19][20]

PAD emotional state model[edit]

The PAD emotional state model is a psychological model developed by Albert Mehrabian and James A. Russell to describe and measure emotional states. PAD uses three numerical dimensions to represent all emotions.[21][22] The PAD dimensions are Pleasure, Arousal and Dominance.

The Pleasure-Displeasure Scale measures how pleasant an emotion may be. For instance both anger and fear are unpleasant emotions, and score high on the displeasure scale. However joy is a pleasant emotion.[21]

The Arousal-Nonarousal Scale measures how energized or soporific one feels. It is not the intensity of the emotion -- for grief and depression can be low arousal intense feelings. While both anger and rage are unpleasant emotions, rage has a higher intensity or a higher arousal state. However boredom, which is also an unpleasant state, has a low arousal value.[21]

The Dominance-Submissiveness Scale represents the controlling and dominant nature of the emotion. For instance while both fear and anger are unpleasant emotions, anger is a dominant emotion, while fear is a submissive emotion.[21]

Criticisms[edit]

Cultural considerations[edit]

Ethnographic and cross-cultural studies of emotions have shown the variety of ways in which emotions differ with cultures. Because of these differences, many cross-cultural psychologists and anthropologists challenge the idea of universal classifications of emotions altogether.

Cultural differences have been observed in the way in which emotions are valued, expressed, and regulated. The social norms for emotions, such as the frequency with or circumstances in which they are expressed, also vary drastically.[23][24] For example, the demonstration of anger is encouraged by Kaluli people, but condemned by Utku Inuit people.[25] The largest piece of evidence that disputes the universality of emotions is language. Differences within languages directly correlate to differences in emotion taxonomy. Languages differ in that they categorize emotions based on different components. Some may categorize by event types whereas others categorize by action readiness. Furthermore, emotion taxonomies vary due to the differing implications emotions have in different languages.[23] That being said, not all English words have equivalents in all other languages and vice versa, indicating that there are words for emotions present in some languages but not in others.[26] Emotions such as the schadenfreude in German and saudade in Portuguese are commonly expressed in emotions in their respective languages, but lack an English equivalent. Some languages do not differentiate between emotions that are considered to be the basic emotions in English. For instance, certain African languages have one word for both anger and sadness, and others for shame and fear. There is ethnographic evidence that even challenges the universality of the category "emotions" because certain cultures lack a specific word relating to the English word "emotions".[24]

Lists of emotions[edit]

Humans experience emotion, with evidence used that they influence action, thoughts and behavior. Emotions are categorized into various affects, which correspond to the current situation.[27] An affect is the range of feeling experienced.[28] Both positive and negative emotions are needed in our daily lives.[29]

Many theories of emotion have been proposed,[30] with contrasting views.[31]

Basic emotions[edit]

  • William James in 1890 proposed four basic emotions: fear, grief, love, and rage, based on bodily involvement.[32]
  • Paul Ekman identified six basic emotions: anger, disgust, fear, happiness, sadness and surprise.[33] Wallace V. Friesen and Phoebe C. Ellsworth worked with him on the same basic structure.[34] The emotions can be linked to facial expressions. In the 1990s, Ekman proposed an expanded list of basic emotions, including a range of positive and negative emotions that are not all encoded in facial muscles.[35] The newly included emotions are: Amusement, Contempt, Contentment, Embarrassment, Excitement, Guilt, Pride in achievement, Relief, Satisfaction, Sensory pleasure, and Shame.[35]
  • Richard and Bernice Lazarus in 1996 expanded the list to 15 emotions: aesthetic experience, anger, anxiety, compassion, depression, envy, fright, gratitude, guilt, happiness, hope, jealousy, love, pride, relief, sadness, and shame, in the book Passion and Reason.[36][37]
  • Researchers[38] at University of California, Berkeley identified 27 categories of emotion: admiration, adoration, aesthetic appreciation, amusement, anger, anxiety, awe, awkwardness, boredom, calmness, confusion, craving, disgust, empathic pain, entrancement, excitement, fear, horror, interest, joy, nostalgia, relief, romance, sadness, satisfaction, sexual desire and surprise.[39] This was based on 2185 short videos intended to elicit a certain emotion. These were then modeled onto a "map" of emotions.[40]

Contrasting basic emotions[edit]

A 2009 review[41] of theories of emotion identifies and contrasts fundamental emotions according to three key criteria for mental experiences that:

  1. have a strongly motivating subjective quality like pleasure or pain;
  2. are a response to some event or object that is either real or imagined;
  3. motivate particular kinds of behavior.

The combination of these attributes distinguishes emotions from sensations, feelings and moods.

Kind of emotion Positive emotions Negative emotions
Related to object properties Interest, curiosity, enthusiasm Indifference, habituation, boredom
Attraction, desire, admiration Aversion, disgust, revulsion
Surprise, amusement Alarm, panic
Future appraisal Hope, excitement Fear, anxiety, dread
Event-related Gratitude, thankfulness Anger, rage
Joy, elation, triumph, jubilation Sorrow, grief
Patience Frustration, restlessness
Contentment Discontentment, disappointment
Self-appraisal Humility, modesty Pride, arrogance
Social Charity Avarice, greed, miserliness, envy, jealousy
Sympathy Cruelty
Cathected Love Hate

HUMAINE's proposal for EARL[edit]

The emotion annotation and representation language (EARL) proposed by the Human-Machine Interaction Network on Emotion (HUMAINE) classifies 48 emotions.[42]

Parrott's emotions by groups[edit]

A tree-structured list of emotions was described in Shaver et al. (1987),[43] and also featured in Parrott (2001).[44]

Primary emotion Secondary emotion Tertiary emotion
Love Affection Adoration · Fondness · Liking · Attraction · Caring · Tenderness · Compassion · Sentimentality
Lust/Sexual desire Desire · Passion · Infatuation
Longing Longing
Joy Cheerfulness Amusement · Bliss · Gaiety · Glee · Jolliness · Joviality · Joy · Delight · Enjoyment · Gladness · Happiness · Jubilation · Elation · Satisfaction · Ecstasy · Euphoria
Zest Enthusiasm · Zeal · Excitement · Thrill · Exhilaration
Contentment Pleasure
Pride Triumph
Optimism Eagerness · Hope
Enthrallment Enthrallment · Rapture
Relief Relief
Surprise Surprise Amazement · Astonishment
Anger Irritability Aggravation · Agitation · Annoyance · Grouchy · Grumpy · Crosspatch
Exasperation Frustration
Rage Anger · Outrage · Fury · Wrath · Hostility · Ferocity · Bitterness · Hatred · Scorn · Spite · Vengefulness · Dislike · Resentment
Disgust Revulsion · Contempt · Loathing
Envy Jealousy
Torment Torment
Sadness Suffering Agony · Anguish · Hurt
Sadness Depression · Despair · Gloom · Glumness · Unhappiness · Grief · Sorrow · Woe · Misery · Melancholy
Disappointment Dismay · Displeasure
Shame Guilt · Regret · Remorse
Neglect Alienation · Defeatism · Dejection · Embarrassment · Homesickness · Humiliation · Insecurity · Insult · Isolation · Loneliness · Rejection
Sympathy Pity · Mono no aware · Sympathy
Fear Horror Alarm · Shock · Fear · Fright · Horror · Terror · Panic · Hysteria · Mortification
Nervousness Anxiety · Suspense · Uneasiness · Apprehension (fear) · Worry · Distress · Dread

Plutchik's wheel of emotions[edit]

  Anticipation
  Joy
  Trust
  Fear
  Surprise
  Sadness
  Disgust
  Anger
The primary, secondary and tertiary dyads.

In 1980, Robert Plutchik diagrammed a wheel of eight emotions: joy, trust, fear, surprise, sadness, disgust, anger and anticipation, inspired by his Ten Postulates.[45][46] Plutchik also theorized twenty-four "Primary", "Secondary", and "Tertiary" dyads (feelings composed of two emotions).[47][48][49][50][51][52][53] The wheel emotions can be paired in four groups:

Primary dyad = one petal apart = Love = Joy + Trust
Secondary dyad = two petals apart = Envy = Sadness + Anger
Tertiary dyad = three petals apart = Shame = Fear + Disgust
Opposite emotions = four petals apart = Anticipation ∉ Surprise

There are also triads, emotions formed from 3 primary emotions.[54] This leads to a combination of 24 dyads and 32 triads, making 56 emotions at 1 intensity level.[55] Emotions can be mild or intense;[56] for example, distraction is a mild form of surprise, and rage is an intense form of anger. The kinds of relation between each pair of emotions are:

Emotions and opposites
Mild emotion Mild opposite Basic emotion Basic opposite Intense emotion Intense opposite
Serenity Pensiveness, Gloominess Joy, Cheerfulness Sadness, Dejection Ecstasy, Elation Grief, Sorrow
Acceptance, Tolerance Boredom, Dislike Trust Disgust, Aversion Admiration, Adoration Loathing, Revulsion
Apprehension, Dismay Annoyance, Irritation Fear, Fright Anger, Hostility Terror, Panic Rage, Fury
Distraction, Uncertainty Interest, Attentiveness Surprise Anticipation, Expectancy Amazement, Astonishment Vigilance
Dyads (Combinations)
Human feelings Emotions Opposite feelings Emotions
Optimism, Courage Anticipation + Joy Disapproval, Disappointment Surprise + Sadness
Hope, Fatalism Anticipation + Trust Unbelief, Shock Surprise + Disgust
Anxiety, Dread Anticipation + Fear Outrage, Hate Surprise + Anger
Love, Friendliness Joy + Trust Remorse, Misery Sadness + Disgust
Guilt, Excitement Joy + Fear Envy, Sullenness Sadness + Anger
Delight, Doom Joy + Surprise Pessimism Sadness + Anticipation
Submission, Modesty Trust + Fear Contempt, Scorn Disgust + Anger
Curiosity Trust + Surprise Cynicism Disgust + Anticipation
Sentimentality, Resignation Trust + Sadness Morbidness, Derisiveness Disgust + Joy
Awe, Alarm Fear + Surprise Aggressiveness, Vengeance Anger + Anticipation
Despair Fear + Sadness Pride, Victory Anger + Joy
Shame, Prudishness Fear + Disgust Dominance Anger + Trust
Opposite combinations[50]
Human feelings Emotions
Bittersweetness Joy + Sadness
Ambivalence Trust + Disgust
Frozenness Fear + Anger
Confusion Surprise + Anticipation

Similar emotions in the wheel are adjacent to each other.[57] Anger, Anticipation, Joy, and Trust are positive in valence, while Fear, Surprise, Sadness, and Disgust are negative in valence. Anger is classified as a "positive" emotion because it involves "moving toward" a goal,[58] while surprise is negative because it is a violation of someone's territory.[59] The emotion dyads each have half-opposites and exact opposites:[60]

Anticipation, Joy, Surprise, Sadness
+ Sadness Joy
Anticipation Pessimism Optimism
Surprise Disapproval Delight
Joy, Trust, Sadness, Disgust
+ Disgust Trust
Joy Morbidness Love
Sadness Remorse Sentimentality
Trust, Fear, Disgust, Anger
+ Fear Anger
Trust Submission Dominance
Disgust Shame Contempt
Fear, Surprise, Anger, Anticipation
+ Surprise Anticipation
Anger Outrage Aggressiveness
Fear Awe Anxiety
Trust, Surprise, Disgust, Anticipation
+ Surprise Anticipation
Trust Curiosity Hope
Disgust Unbelief Cynicism
Joy, Fear, Sadness, Anger
+ Fear Anger
Joy Guilt Pride
Sadness Despair Envy

Six emotion axes[edit]

Some people[who?] list six emotion axes with different opposite emotions, and different emotions coming from ranges.[61]

Emotional flow
Axis -1.0 -0.5 0 0 +0.5 +1.0
Anxiety – Confidence Anxiety Worry Discomfort Comfort Hopeful Confident
Boredom – Fascination Ennui Boredom Indifference Interest Curiosity Intrigue
Frustration – Euphoria Frustration Puzzlement Confusion Insight Enlightenment Epiphany
Dispirited – Encouraged Dispirited Disappointed Dissatisfied Satisfied Thrilled Enthusiastic
Terror – Enchantment Terror Dread Apprehension Calm Anticipatory Excited
Humiliation – Pride Humiliated Embarrassed Self-conscious Pleased Satisfied Proud

They also made a model labeling phases of learning emotions.[61]

Negative Affect Positive Affect
Constructive Learning Disappointment, Puzzlement, Confusion Awe, Satisfaction, Curiosity
Un-learning Frustration, Discard,

Misconceptions

Hopefulness, Fresh research

The Hourglass of Emotions[edit]

The Hourglass Model Revisited

The Hourglass of Emotions is based on Robert Plutchik's model, but categorizes emotions into four sentic dimensions. It contrasts joy, calmness, pleasantness and eagerness as positive emotions, and sadness, anger, disgust and fear as negative.[62][63]

Emotion Categorization
Dimension [+1,+0.66) [+0,66,+0,33) [+0.33,0) (0,-0.33] (-0.33,-0.66] (-0.66,1]
Introspection Ecstasy Joy Contentment Melancholy Sadness Grief
Temper Bliss Calmness Serenity Annoyance Anger Rage
Attitude Delight Pleasantness Acceptance Dislike Disgust Loathing
Sensitivity Enthusiasm Eagerness Responsiveness Anxiety Fear Terror
Compound Emotions
JOY PLEASANTNESS love enjoyment amusement
EAGERNESS euphoria excitement thrill
CALMNESS enlightenment relaxation sweet idleness
SADNESS DISGUST hate guilt remorse
FEAR distress troubledness misery
ANGER envy bitterness resentment
CALMNESS PLEASANTNESS assertiveness compassion empathy
EAGERNESS focus determination perseverance
FEAR carelessness laxity looseness
ANGER DISGUST hatred ruthlessness viciousness
FEAR nastiness coercion possessiveness
EAGERNESS stubborness obstinacy mulishness
PLEASANTNESS DISGUST shamelessness cheekiness brazenness
EAGERNESS kindness audacity hospitality
FEAR awe submission reverence
DISGUST JOY morbidness schadenfreude gloat
FEAR impiety cowardness inhospitality
EAGERNESS recklessness temerity rashness
EXPECTATION JOY hope anticipation optimism
SADNESS hopelessness despair pessimism
EAGERNESS vigilance alertness caution
SURPRISE ANGER shock outrage thunderstruckness
FEAR alarm dismay dumbstruckness
PLEASANTNESS amazement astonishment wonderstruckness

The Book of Human Emotions[edit]

Tiffany Watt Smith listed 154 different worldwide emotions and feelings.[64]

Mapping facial expressions[edit]

Scientists map twenty-one different facial emotions[66][67] expanded from Paul Ekman's six basic emotions of anger, disgust, fear, happiness, sadness, and surprise:

Happy Sad Fearful Angry Surprised Disgusted
HappilySurprised HappilyDisgusted
SadlyFearful SadlyAngry SadlySurprised SadlyDisgusted
Appalled FearfullyAngry FearfullySurprised FearfullyDisgusted
Awed AngrilySurprised AngrilyDisgusted
Hatred DisgustedlySurprised

Emotional equations[edit]

A book written by Chip Conley showed how emotions and feelings are organised using mathematical terms.[68]

Despair = Suffering - Meaning
Disappointment = Expectations - Reality
Regret = Disappointment + Responsibility
Jealousy =
Envy =
Anxiety = Uncertainty x Powerlessness
Calling =
Workaholism =
Flow =
Curiosity = Wonder + Awe
Authenticity = Self-Awareness x Courage
Narcissism = (Self-Esteem)2 x Entitlement
Integrity = Authenticity x Invisibility x Reliability
Happiness = Love - Fear
Thriving =
Faith =
Wisdom = √Experience

Atlas of emotions[edit]

The Dalai Lama made a website based on the emotions of enjoyment, disgust, anger, fear and sadness with the help of Paul Ekman.[69][70] The emotions were similar to the ones found in Inside Out, a film that Paul Ekman advised.[71]

Emotion and stress[edit]

Emotions and stress are connected, so stressful situations produce emotion. Environments that make stress also make emotions.[72]

See also[edit]

Bibliography[edit]

  • Ekman, P. (1972). Universals and cultural differences in facial expression of emotion. In J. Cole (Ed.), Nebraska Symposium on Motivation. Lincoln, Nebraska: University of Nebraska Press: pp. 207–283.
  • Ekman, P. (1992). "An argument for basic emotions". Cognition and Emotion. 6 (3): 169–200. CiteSeerX 10.1.1.454.1984. doi:10.1080/02699939208411068.
  • Ekman, P. (1999). Basic Emotions. In T. Dalgleish and T. Power (Eds.) The Handbook of Cognition and Emotion Pp. 45–60. Sussex, U.K.: John Wiley & Sons, Ltd.
  • Fontaine, J.; Scherer, KR; Roesch, EB; Ellsworth, PC (2007). "The world of emotions is not two-dimensional". Psychological Science. 18 (12): 1050–1057. CiteSeerX 10.1.1.1031.3706. doi:10.1111/j.1467-9280.2007.02024.x. PMID 18031411. S2CID 1779061.
  • Koelsch, S.; Jacobs, AM.; Menninghaus, W.; Liebal, K.; Klann-Delius, G.; von Scheve, C.; Gebauer, G. (2015). "The quartet theory of human emotions: An integrative and neurofunctional model". Phys Life Rev. 13: 1–27. doi:10.1016/j.plrev.2015.03.001. PMID 25891321.

Notes and references[edit]

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  2. ^ a b Ekman, Paul (1992). "An Argument for Basic Emotions". Cognition and Emotion. 6 (3/4): 169–200. CiteSeerX 10.1.1.454.1984. doi:10.1080/02699939208411068.
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  11. ^ a b Remington, N. A.; Fabrigar, L. R.; Visser, P. S. (2000). "Re-examining the circumplex model of affect". Journal of Personality and Social Psychology. 79 (2): 286–300. doi:10.1037/0022-3514.79.2.286. PMID 10948981.
  12. ^ Russell, James; Feldman Barrett, Lisa (1999). "Core affect, prototypical emotional episodes, and other things called emotion: dissecting the elephant". Journal of Personality and Social Psychology. 76 (5): 805–819. doi:10.1037/0022-3514.76.5.805. PMID 10353204.
  13. ^ Bradley, M. M.; Greenwald, M. K.; Petry, M.C.; Lang, P. J. (1992). "Remembering pictures: Pleasure and arousal in memory". Journal of Experimental Psychology: Learning, Memory, and Cognition. 18 (2): 379–390. doi:10.1037/0278-7393.18.2.379. PMID 1532823.
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  15. ^ Plutchik, R. "The Nature of Emotions". American Scientist. Archived from the original on July 16, 2001. Retrieved 14 April 2011.CS1 maint: unfit url (link)
  16. ^ Plutchik, Robert (16 September 1991). The Emotions. University Press of America. p. 110. ISBN 9780819182869. Retrieved 16 September 2017 – via Google Books.
  17. ^ Plutchik, R. "The Nature of Emotions". American Scientist. Archived from the original on July 16, 2001. Retrieved 14 April 2011.CS1 maint: unfit url (link)
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  22. ^ Bales, Robert Freed (2001). Social interaction systems: theory and measurement. pp. 139–140. ISBN 978-0-7658-0872-1.
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