“How many psychologists does it take to change a light bulb?”
One, but the bulb has to want to change.
It’s a classic joke in psychology and like most good jokes, it disguises a truth. Every leader, manager, or individual who has tried to drive transformation, personal or organizational, knows how difficult real change can be. Behavioral psychologists may argue that change is all about training the brain and skeptics would insist that most people never truly change. Somewhere in between lies a more nuanced reality, where biology, environment and awareness intersect.
The human brain is designed to survive through uncertainty. Within our brain resides a fascinating operating system, which has evolved to avoid harm & discomfort and strives to maintain equilibrium or sense of stability. When something disrupts that stability, even a small environmental shift, the brain raises alarms.
It doesn’t matter if the “danger” is a real threat or your HR team deciding to reshuffle the office seating plan to increase productivity. The change feels uncomfortable as it dismantles familiar patterns and pushes us into uncharted emotional territory, which our brain could interpret as a potential threat, and react instinctively with fight, flight and freeze responses to reassert control.
This is why behavioral change often feels so hard, as it isn’t just mental resistance; it’s physiological defense. Yet, in modern life, most of the “dangers” we face are not life-threatening. They’re emotional, social, or reputational. The stakes feel high, even when they rarely are. More often, they represent opportunities, a new perspective, a different way of working, or a deeper understanding of ourselves. Recognizing this distinction helps us reframe discomfort not as a warning sign, but as a signpost for growth.
The Social Nature of Change
Humans are social creatures and much of what we do is linked to social norms and expectations, which is why modern interventions for societal change have adopted social influence as tool for behavior change. Research has repeatedly shown that simply telling people what’s “right” doesn’t change behavior. For example, campus campaigns informing college students about the dangers of heavy drinking has little effect (Blane & Hewitt, 1977). However, when the information is paired with information on what their peers are actually doing (normative behaviour), in this case, campus campaigns which had information that most students drink moderately, the results shift dramatically because people recalibrate their behavior to align with perceived social norms.
A well-known intervention study in Montana applied this principle to seat belt use. A survey on Montana drivers found that most people believed only 60% of others wore seat belts, when in reality it was 85%. Public campaigns that shared the actual statistic with a slogan “Most Montanans wear seat belts” not only corrected that misperception but increased seat belt use significantly (Linkenbach & Perkins, 2003).
Successful social interventions have validated the concept that people tend to act in accordance with what they believe their peers value and approve of (Miller & Prentice, 2016).
The role of Social Norms
Social norms communicate two crucial things: One, how common a behavior is and second, how socially appropriate the behavior is. When these two pieces of information are paired, it allows individuals to evaluate their own behavior in relation to the group. When people realize that a positive behavior is both common and respected, they are more motivated to align with it, as it reinforces a sense of belonging.
In public goods scenarios, for example, when given a choice to use the dustbin at a public place where everyone else is littering, the choice often feels binary: be the fool who follows the rules, or the knave who exploits the system. Effective behavioral interventions reshape that equation where the prosocial behavior is positioned as smart shared choice grounded in collective values. If littering, for instance, is framed not as unhygienic but as unpatriotic and a threat to national pride, then people begin to internalize the behavior as a moral and social responsibility. It becomes less about compliance and more about identity.
For social norms to drive real change, they must connect to shared values, which form the emotional anchors that define a community. Peer information helps, but it works best for those who already value the behavior but lack social reinforcement. It reassures them that they’re not alone and strengthens their commitment. For individuals who pride themselves on non-conformity, peer influence may have little effect. But even then, visible alignment among others can create a cultural shift that makes non-conformity less appealing or at least less rewarding. The most successful norm-based interventions pair factual feedback (what people do) with value-based framing (why they do it). Without that link, feedback loses power. With it, change becomes desirable, achievable and aligned to self-identity.
Finally, even the best-designed behavioral interventions fail if change isn’t practically accessible. It’s one thing to promote cleanliness as socially responsible; it’s another if there are no dustbins in public places or if recycling is time consuming and expensive. Accessibility converts intention into action and this applies to behaviour change as well. When undergoing change, people often look to their environment for cues to promote behaviours and for interventions to be successful, the surrounding environment must have models of appropriate behaviour as well as restrictions for harmful ones.
So, can people truly change?
Research suggests that yes they can, but not because someone tells them to. Behaviour change seems to be less about will power and more about behavioural and social architecture. By shaping the environment, presenting reinforcing information, and creating awareness of the social context, behavior change can be framed as easy, valued and rewarding.
While the human brain may resist discomfort, it also craves coherence and connection. When change is repositioned as a way to stay aligned with who we are and the people around us, the transformation follows naturally, like a light bulb switching on.
References
- Blane HT, Hewitt LC. 1977. Mass Media Public Education and Alcohol: A State-of-the-Art Review. Rockville, MD:Natl. Inst. Alcohol Abuse Alcohol.
- Linkenbach J, Perkins HW. 2003. Most of us wear seatbelts: the process and outcomes of a 3-year statewide adult seatbelt campaign in Montana. Presented at Natl. Conf. Soc. Norms Model, July 17, Boston, MA
- Miller, D. T., & Prentice, D. A. (2016). Changing norms to change behavior. Annual Review of Psychology, 67(1), 339–361. https://doi.org/10.1146/annurev-psych-010814-015013
