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Barbara Lee Fredrickson (born June 15, 1964)[1] is an American professor in the department of psychology at the University of North Carolina at Chapel Hill, where she is the Kenan Distinguished Professor of Psychology. She is also the Principal Investigator of the Positive Emotions and Psychophysiology Lab (PEPLab) at the University of North Carolina at Chapel Hill.

Fredrickson is a social psychologist who conducts research in emotions and positive psychology. Her main work is related to her broaden-and-build theory of positive emotions, which suggests that positive emotions lead to novel, expansive, or exploratory behavior, and that, over time, these actions lead to meaningful, long-term resources such as knowledge and social relationships. She is the author of Positivity (2009), a general-audience book that draws on her own research and that of other social scientists. She also released a new book in January 2013, Love 2.0, which discusses the supreme emotion of love, micro-moments of connection as well as how love can affect your biological and cellular make-up over time.

Fredrickson earned her Ph.D. from Stanford University in 1990. She was a professor at the University of Michigan for 10 years before moving to the University of North Carolina at Chapel Hill.

Fredrickson's mentors include Robert Levenson and Laura L. Carstensen.




Central to many existing theories of emotion is the concept of specific-action tendencies – the idea that emotions prepare the body both physically and psychologically to act in particular ways. For example, anger creates the urge to attack, fear causes an urge to escape and disgust leads to the urge to expel. From this framework, positive emotions posed a puzzle. Emotions like joy, serenity and gratitude don’t seem as useful as fear, anger or disgust. The bodily changes, urges to act and the facial expressions produced by positive emotions are not as specific or as obviously relevant to survival as those sparked by negative emotions. If positive emotions didn’t promote our ancestors’ survival in life-threatening situations, then what good were they? How did they survive evolutionary pressures? Did they have any adaptive value at all? Barbara Fredrickson developed the Broaden-and-Build Theory of Positive Emotions[2] to explain the mechanics of how positive emotions were important to survival. According to the theory, positive emotions expand cognition and behavioral tendencies. Taking issue with the view that all emotions lead to specific action tendencies, the theory argues that positive emotions increase the number of potential behavioral options. Instead, emotions should be cast as leading to changes in “momentary thought-action repertoires” – a range of potential actions the body and mind are prepared to take. The expanded cognitive flexibility evident during positive emotional states results in resource building that becomes useful over time. Even though a positive emotional state is only momentary, the benefits last in the form of traits, social bonds, and abilities that endure into the future. The implication of this work is that positive emotions have inherent value to human growth and development and cultivation of these emotions will help people lead fuller lives.

Studies from Fredrickson's lab have randomly assigned participants to watch films that induce positive emotions such as amusement and contentment, negative emotions such as fear and sadness, or no emotions. Compared to people in the other conditions, participants who experience positive emotions show heightened levels of creativity, inventiveness, and "big picture" perceptual focus. Longitudinal studies show that positive emotions play a role in the development of long-term resources such as psychological resilience and flourishing.[3]

Positivity/negativity ratioEdit

Fredrickson's 2005 paper, co-authored with Marcial Losada, argued that there exist precise values of an individual's emotional positivity-to-negativity ratio, outside of which they will fail to flourish.[4] Fredrickson and Losada's use of nonlinear dynamics modelling, taken from fluid dynamics, to derive these values, has been strongly criticised by Nicholas Brown, Alan Sokal, and Harris Friedman, who point out numerous fundamental mathematical errors in the article (see Losada line).[5] Fredrickson has agreed that the mathematical modelling is "questionable", but stands by the more general idea that a high emotional positivity-to-negativity ratio is beneficial.[6] The whole theory of the critical positivity ratio was discredited by Nicholas Brown, Alan Sokal, and Harris Friedman, in a 2013 article published in American Psychologist,[5] the same journal in which Fredrickson's original findings were published in 2005. Brown et al. argue that Losada's conclusions in previous papers using modelling from fluid dynamics, and those in his paper co-authored with Fredrickson,[4] are not only based on poorly-reported experiments – they argue that it is difficult to draw any conclusions from some previous studies by Losada because critical details are omitted, and "interpretations of results are made with little or no justification" (p. 5) – but are based on elementary errors in the use of differential equations.

The undoing effectEdit

Fredrickson and others hypothesize that positive emotions undo the cardiovascular effects of negative emotions. When people experience stress, they show increased heart rate, higher blood sugar, immunosuppression, and other adaptations optimized for immediate action. If individuals do not regulate these changes once the stress is past, they can lead to illness, such as coronary disease, and heightened mortality. Both lab research and survey research indicate that positive emotions help people who were previously under stress relax back to their physiological baseline.[7]

Past research has shown that anger, fear and sadness each elicit distinct responses in the autonomic nervous system. In direct contrast, the positive emotions appeared to have no distinguishable autonomic responses. Positive emotions do not themselves generate cardiovascular reactivity, but instead quell any existing cardiovascular reactivity caused by negative emotions. Put differently, a prior state of negative emotional arousal may be a necessary backdrop to illuminate the cardiovascular impact of positive emotions. Assuming (as most emotion theorists do) that the cardiovascular reactivity sparked by certain negative emotions prepares the body for specific actions, the broaden-and-build theory suggests that positive emotions can speed recovery from—or undo—this cardiovascular reactivity and return the body to mid-range levels of activation suitable for pursuing a wider range of behavioral options.[8] According to this view, positive emotions have a unique ability to down-regulate lingering negative emotions and the psychological and physiological states they generate. In one of the studies,[7] they gave participants an acute stressor – the possibility of giving a public speech. As participants prepare for this speech their bodies exhibit increased sympathetic nervous system activation (sweaty palms, increased heart rate, increased blood pressure). After a minute or so of this heightened state of arousal, participants learn that they don’t have to give the speech after all and instead view a randomly assigned video clip that generates a positive or negative emotion, or a state of neutrality. Fredrickson and colleagues measured the amount of time it took each person to recover from the anxiety about the possible speech. Results indicated that positive emotions led to a quicker return to a resting state than neutral or negative emotions. This is called the undoing effect.

Sex differences in self-objectificationEdit

Prior to her work on positive emotions, Fredrickson researched social and environmental cues that can carry sexist messages and enhance stereotypical gender differences. She found that when women are randomly assigned dress in a way that calls attention to their bodies, they show impaired performance on a math task and were literally more likely to "throw like a girl". This research suggested that drawing attention to women's bodies also activated stereotypical beliefs about their gender.[9] She has also contributed to research for the Objectification Theory which posits that women internalize an outsider's point of view when viewing themselves and their bodies.[10] She argues that this objectification of women's bodies may have contributed to the high prevalence of mental health risks that plague women.

Loving-kindness meditationEdit

As a means to test the build hypothesis, central to the broad-and-build theory, Fredrickson and colleagues assessed the impact of learning to self-generate positive emotions by learning loving-kindness meditation (LKM), an ancient Buddhist mind-training practice. A paper published in 2008 showed that LKM produces enduring increases in positive emotions, which in turn builds a range of consequential personal resources that augment life satisfaction and curb depressive symptoms.[11] A paper published in 2013 also shows that LKM, by increasing positive emotions and perceived positive social connections, improves cardiovascular health. [12]


Fredrickson received the American Psychological Association’s inaugural Templeton Prize in Positive Psychology in 2000 for her work on the broaden-and-build theory, which included a $100,000 grant to fund her work. Her work has been supported continuously for the past 16 years by grants from the National Institutes of Health. She also received the Society of Experimental Social Psychology’s Career Trajectory Award in 2008. She was awarded the inaugural Christopher Peterson Gold Medal in 2013, which is the highest honor bestowed by the International Positive Psychology Association. Fredrickson's work is cited widely and she is regularly invited to give keynotes nationally and internationally.

Selected publicationsEdit

  • Fredrickson, Barbara (2009). Positivity. New York: Crown.
  • Fredrickson, Barbara (2013). Love 2.0. New York: Hudson Street Press.
  • Fredrickson, B. L. (2013). Updated thinking on the positivity ratio. American Psychologist, 68, 814-822.
  • Fredrickson, B. L. (2013). Positive emotions broaden and build. In E. Ashby Plant & P. G. Devine (Eds.), Advances on Experimental Social Psychology, 47, 1-53. Burlington: Academic Press.
  • Fredrickson, B. L., Grewen, K. M., Coffey, K. A., Algoe, S. B., Firestine, A. M., Arevalo, J. M. G., Ma, J., & Cole, S. W. (2013). A functional genomic perspective on human well-being. Proceedings of the National Academy of Sciences, 110, 13684-13689.
  • Fredrickson, B. L., Cohn, M. A., Coffey, K. A., Pek, J., & Finkel, S. M. (2008). Open hearts build lives: Positive emotions, induced through loving-kindness meditation, build consequential personal resources. Journal of Personality and Social Psychology, 95, 1045-1062.
  • Fredrickson, B. L. & Losada, M. (2005). Positive affect and the complex dynamics of human flourishing. American Psychologist, 60, 678-686.
  • Fredrickson, B. L., & Branigan, C. (2005). Positive emotions broaden the scope of attention and thought-action repertoires. Cognition and Emotion, 19, 313-332.
  • Fredrickson, B. L. (2003). The value of positive emotions. American Scientist, 91, 330-335.
  • Fredrickson, B. L. (2001). The role of positive emotions in positive psychology: The broaden-and-build theory of positive emotions. American Psychologist, 56, 218-226.
  • Fredrickson, B. L. (2000). Cultivating positive emotions to optimize health and well-being. Target article in Prevention and Treatment, 3.
  • Fredrickson, B. L. (1998). What good are positive emotions? Review of General Psychology, 2, 300-319.
  • Fredrickson, B. L., & Roberts, T.-A. (1997). Objectification theory: Toward understanding women's lived experiences and mental health risks. Psychology of Women Quarterly, 21, 173-206.


  1. ^ U.S. Public Records Index Vol 1 (Provo, UT: Operations, Inc.), 2010.
  2. ^ Fredrickson, B. L. (2001). The role of positive emotions in positive psychology: The broaden-and-build theory of positive emotions. American Psychologist, 56, 218-226.
  3. ^ Fredrickson, B. L. (2003). The value of positive emotions. American Scientist, 91, 330-335.
  4. ^ a b Fredrickson, B. L. & Losada, M. F. (2005). Positive affect and the complex dynamics of human flourishing. American Psychologist, 60, 678–686.
  5. ^ a b Brown, N. J. L., Sokal, A. D., & Friedman, H. L. (2013). The Complex Dynamics of Wishful Thinking: The Critical Positivity Ratio. American Psychologist. Electronic publication ahead of print.
  6. ^ Fredrickson, B. L. (2013). Updated thinking on positivity ratios. American Psychologist, 68, 814-822.
  7. ^ a b Fredrickson, B. L., Mancuso, R. A., Branigan, C., & Tugade, M. M. (2000). The undoing effect of positive emotions. Motivation and Emotion, 24," 237-258.
  8. ^ Fredrickson, B. L. & Levenson, R. W. (1998). Positive emotions speed recovery from the cardiovascular sequelae of negative emotions. Cognition and Emotion, 12, 191-220.
  9. ^ Fredrickson, B. L. Roberts, T., Noll, S. M., Quinn, D. M., & Twenge, J. M. (1998). That swimsuit becomes you: Sex differences in self-objectification, restrained eating and math performance. Journal of Personality and Social Psychology, 75, 269-284.
  10. ^ Fredrickson, B.L.; Roberts, T-A. (June 1997). "Objectification Theory". Psychology of Women Quarterly. 21 (2): 173–206. doi:10.1111/j.1471-6402.1997.tb00108.x. 
  11. ^ Fredrickson, B. L., Cohn, M. A., Coffey, K. A., Pek, J., & Finkel, S. M. (2008). Open hearts build lives: Positive emotions, induced through loving-kindness meditation, build consequential personal resources. Journal of Personality and Social Psychology, 95, 1045-1062.
  12. ^ Kok, B. E., Coffey, K. A., Cohn, M. A., Catalino, L. I., Vacharkulksemsuk, T., Algoe, S. B., Brantley, M., & Fredrickson, B. L. (2013). How positive emotions build physical health: Perceived positive social connections account for the upward spiral between positive emotions and vagal tone. Psychological Science, 24, 1123-1132.

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