Baumeister's research focuses on six themes: self control, decision-making, the need to belong and interpersonal rejection, human sexuality, irrational and self-destructive behavior, and free will. He is the most cited author of a series of psychology journals focusing on personality such as
Psychological Bulletin,
Journal of Personality,
Personality and Social Psychology Review (T&F),
Psychological Science in the Public Interest.
The self Baumeister has conducted research on the
self, focusing on various concepts related to how people perceive, act, and relate to their selves. Baumeister wrote a chapter titled, "The Self" in
The Handbook of Social Psychology, and reviewed the research on
self-esteem, concluding that the perceived importance of self-esteem is overrated.
Irrationality and self-defeating behavior In a series of journal articles and books, Baumeister inquired about the reasons for self-defeating behavior. His conclusions: there is no self-defeating urge (as some have thought). Rather, self-defeating behavior is either a result of trade-offs (enjoying drugs now at the expense of the future), backfiring strategies (
eating a snack to reduce stress only to feel more stressed), or a psychological strategy to escape the self – where various self-defeating strategies are rather directed to relieve the burden of selfhood.
The Need to Belong Baumeister wrote a paper on the
need-to-belong theory with
Mark Leary in 1995. This theory seeks to show that humans have a natural need to belong with others. Baumeister and Leary suggest that human beings naturally push to form relationships. This push helps to distinguish a need (rather than a desire). In addition to the drive for attachment, people also struggle to avoid the disintegration of these relationships. Baumeister and Leary's need-to-belong theory posited that the relationship could be with anyone.
Self-regulation Baumeister also researched self-regulation. He coined the term "
ego depletion" to describe the evidence that humans' ability to self-regulate is limited, and after using it there is less ability (or energy) to self-regulate. Ego depletion has a general effect, such that exerting self-control in one area will use up energy for further regulation in other areas of life. Further research by Baumeister and colleagues has led to the development of the Strength Model of self-control, which likens this ego depletion to the tiredness that comes from physically exerting a muscle. A corollary to this analogy, supported by his research, is that self-control can be strengthened over time, much like a muscle. The energy used up is more than metaphorical, however; his research has found a strong link between ego depletion and depletion of blood-glucose levels. Baumeister also edited two academic books on self-regulation,
Losing Control and
Handbook of Self-Regulation, and has devoted numerous experiments and journal papers to the topic. He also describes this research in a book,
Willpower, authored with former New York Times journalist
John Tierney. In 2016, a large study carried out at two dozen labs in countries across the world that sought to reproduce the effects described in these studies was unsuccessful. Baumeister, however, disputed the protocol used in this replication. Baumeister also plans to run his own pre-registered replication using a protocol that is more in line with most ego-depletion experiments.
Culture and human sexuality A series of studies of human sexuality has addressed questions such as how nature and culture influence people's sex drive, rape and sexual coercion, the cultural suppression of
female sexuality, and how couples negotiate their sexual patterns. In his research, Baumeister reached four major conclusions: Baumeister proposes that "the defining thrust of human psychological evolution was selection in favor of cultural capability" and that these four psychological capabilities evolved to help humans function in the context of culture. In his view, free will is an advanced form of action control that allows humans to act in pro-social ways towards their
enlightened self-interest when acting in these ways would otherwise be in conflict with the fulfillment of evolutionarily older drives or instincts. However, free will is contradictory to the idea of self-interest. Research by Baumeister and colleagues (principally
Kathleen Vohs) has shown that disbelief in free will can lead people to act in ways that are harmful to themselves and society, such as cheating on a test, increased aggression, decreased helpfulness, lower achievement levels in the workplace, and possible barriers to beating addiction. However, although initial studies suggested that believing in free will is associated with more morally praiseworthy behavior, some recent studies have reported contradictory findings.
Erotic plasticity Baumeister coined the term "
erotic plasticity", which is the extent to which one's sex drive can be shaped by cultural, social and situational factors. He argues that women have high plasticity, meaning that their sex drive can more easily change in response to external pressures. On the other hand, men have low plasticity, and therefore have sex drives that are relatively inflexible. ==Works==