Reactivity is a psychological phenomenon where individuals modify their behavior when they know they're being observed, manifesting through effects like the Hawthorne Effect and impacting research validity, educational outcomes, and workplace performance in ways that professional therapy can help address when patterns become problematic.
Ever notice how you act differently when someone's watching? Reactivity explains why we change our behavior under observation — from job interviews to social media posts. Understanding this psychology can help you stay authentic and manage the stress of feeling 'on display.'

In this Article
Understanding Reactivity in Human Behavior
What is Reactivity?
Reactivity is a psychological phenomenon that occurs when individuals modify their behavior because they know they’re being observed. This behavioral change can be positive or negative, depending on the context and the relationship between the observer and the observed. People may alter their actions based on what they perceive the observer expects from them.
Common Types of Reactivity
Researchers have identified several distinct manifestations of reactivity that appear in different contexts:
The Hawthorne Effect
The Hawthorne Effect describes how research participants change their behavior when they know they’re being studied. Named after studies at the Hawthorne Works Plant, researchers found that when workers received special attention from experimenters, their productivity improved—simply because they knew they were being observed.
John Henry Effect
This special case of reactivity occurs when participants in a control group alter their behavior after becoming aware of their status. They may try to “compete” with the experimental group by changing their performance, essentially attempting to overcome what they perceive as a disadvantage—not receiving the special treatment or intervention.
Experimenter Effect
When researchers inadvertently reveal their expectations to study participants, the Experimenter Effect can emerge. Participants may unconsciously modify their behavior to conform to what they believe the researcher wants to see, potentially compromising the validity of the study results.
Observer-Expectancy Effect
The Observer-Expectancy Effect happens when subtle, often unintentional cues from an observer influence someone’s behavior. The classic example comes from the “Clever Hans” experiment, where a horse appeared to perform arithmetic by tapping its hoof. Researchers discovered the horse wasn’t actually calculating but responding to unconscious physical cues from its owner that indicated when to stop tapping.
Pygmalion and Golem Effects
The Pygmalion Effect demonstrates how positive expectations can improve performance, particularly in educational settings. When teachers expect students to excel, students often rise to meet those expectations. Conversely, the Golem Effect shows how negative expectations can lead to diminished performance.
These effects extend beyond classrooms into workplace environments. Leaders who expect certain employees to perform well often provide them with more attention, opportunities, trust, and responsibilities—creating conditions that facilitate better performance.
Bradley Effect
Named after Tom Bradley, an African American candidate in the 1982 California gubernatorial race, this effect describes the discrepancy between polling predictions and actual election results. Voters may provide socially acceptable responses in polls that don’t reflect their actual voting intentions, particularly around sensitive issues like race.
The Watching-Eye Effect
Even symbolic observation can trigger reactivity. The Watching-Eye Effect occurs when people behave differently simply because they see images of eyes watching them. This effect has practical applications in crime prevention, as strategically placed images of eyes can create a sense of being observed, potentially deterring unwanted behaviors.
Why Reactivity Matters
Understanding reactivity has significant implications across many domains:
In Research and Clinical Settings
Scientists design studies carefully to minimize unwanted reactivity that could skew results. Methods include:
- Unobtrusive observation where subjects don’t know they’re being studied
- Blind experimental designs that withhold information from participants
- Single-blind studies where subjects don’t know which treatment they’re receiving
- Double-blind studies where neither researchers nor participants know who’s in the control versus experimental groups
- Triple-blind studies where even those monitoring the research remain unaware of group assignments
In Education
Educators who understand reactivity can harness the power of positive expectations to enhance student performance. By recognizing that their expectations influence how they interact with students—and subsequently how students perform—teachers can create more equitable and supportive learning environments.
In Workplaces
Leaders can leverage reactivity principles to improve employee performance by:
- Setting positive expectations for all team members
- Providing equitable attention and learning opportunities
- Demonstrating respect and trust
- Creating conditions that support success rather than reinforcing perceived limitations
Managing Reactivity in Your Life
If you notice reactivity affecting your relationships or experiences, consider these approaches:
- Become aware of your own expectations and how they might influence your behavior toward others
- Notice when you might be changing your behavior based on being observed
- Consider how others’ expectations might be affecting your performance in school, work, or other settings
- Reflect on whether you’re treating different people in your life differently based on your expectations of them
Professional Support is Available
If you find that patterns of reactivity are negatively impacting your life—whether initiated by yourself or others—professional support can help. Telehealth therapy through platforms like ReachLink connects you with licensed clinical social workers who can help you explore these dynamics and develop effective strategies for managing them.
Through secure video sessions, ReachLink’s licensed clinical social workers can help you:
- Identify patterns of reactivity in your relationships
- Understand how others’ expectations might be influencing your behavior
- Develop strategies to maintain authentic behavior even when under observation
- Address any anxiety or stress related to feeling observed or evaluated
Final Thoughts
Reactivity is a natural human response that affects us all in various contexts. By understanding how observation and expectations shape behavior, you can become more conscious of these influences in your own life. Whether you’re a student, professional, parent, or leader, awareness of reactivity can help you create more authentic interactions and make choices based on your true values rather than others’ expectations.
If reactivity is creating challenges in your life, remember that professional support is available whenever you’re ready to explore these patterns further.
FAQ
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How does reactivity affect the therapeutic process when clients know they're being observed by a therapist?
Therapeutic reactivity is common and actually beneficial when properly managed. Therapists are trained to create a non-judgmental environment where clients can gradually become more authentic. Through techniques like building rapport and normalizing the therapeutic relationship, clients typically become less reactive to being observed over time, allowing for more genuine therapeutic work.
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What therapeutic approaches help people who struggle with changing their behavior when they feel watched or judged?
Cognitive Behavioral Therapy (CBT) and Dialectical Behavior Therapy (DBT) are particularly effective for addressing performance anxiety and reactive behaviors. These approaches help identify thought patterns that trigger reactivity and develop coping strategies. Mindfulness-based interventions also help individuals become more aware of their reactive responses and develop healthier behavioral patterns.
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Can therapy help someone who experiences anxiety or stress when they know others are observing their performance?
Yes, therapy is highly effective for performance-related anxiety and social observation stress. Through exposure therapy, cognitive restructuring, and relaxation techniques, individuals can learn to manage their anxiety responses. Therapists help clients develop confidence and authentic self-expression, reducing the impact of feeling observed on their performance and well-being.
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How do therapists create a safe environment where clients can be authentic despite feeling observed?
Licensed therapists use evidence-based techniques to establish psychological safety, including active listening, empathy, and unconditional positive regard. They normalize the experience of feeling observed and work collaboratively with clients to reduce defensiveness. The therapeutic alliance itself becomes a healing space where clients can practice authentic behavior in a supportive environment.
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What role does self-awareness play in addressing reactive behaviors through therapy?
Self-awareness is fundamental to changing reactive behaviors. Therapy helps individuals recognize their triggers, understand their behavioral patterns, and develop emotional regulation skills. Through increased self-awareness, clients can make conscious choices about their responses rather than reacting automatically to being observed, leading to more authentic and satisfying relationships and performance.
