The Questionnaire That Finally Put Gaslighting Under a Microscope
Researchers at the University of Bundeswehr Munich published the first psychometrically validated instrument specifically designed to measure the experience of gaslighting.
The confusion that gaslighting produces is different from ordinary confusion. Ordinary confusion is temporary. You don’t have the information yet, or you haven’t thought it through, but the framework for understanding is still intact. You still trust that your mind, given enough time or enough data, will get there.
Gaslighting confusion is different. It is not a gap in information. It is a corruption of the instrument you would use to process that information. Your memory. Your perception. Your emotional reactions. Your judgment about whether something is wrong. When someone systematically tells you that all of these are faulty, repeatedly, from inside the relationship you trust most, the problem stops being about any particular event and becomes about whether you can trust yourself at all. That is what makes gaslighting so difficult to name while you are inside it. You are trying to assess the situation with the very tools that have been “compromised.” It is like trying to diagnose a problem with your vision using only your vision.
Most people who have experienced gaslighting do not call it that at the time. They call it confusion, or stress, or the particular exhaustion of trying very hard to understand what is going wrong. They wonder if they are too sensitive. Too reactive. Too much. They spend enormous amounts of energy trying to be more accurate, more fair, more measured in their perceptions because somewhere along the way they absorbed the premise that the problem is their perception, not the person contesting it.
The problem with a concept everyone uses and no one has measured
Gaslighting entered popular consciousness faster than research could follow. By the time it became a household term, the empirical literature was still sparse, methodologically inconsistent, and largely confined to clinical observation and qualitative accounts. We knew it caused harm. We had a general sense of what it looked like. But we did not have a validated tool for measuring it, which meant we could not study it systematically, track its consequences rigorously, or determine with any precision who was most vulnerable to it.
That changed in 2026, when Ellen Dapperger and Karl-Heinz Renner at the University of Bundeswehr Munich published what is, to my knowledge, the first psychometrically validated instrument specifically designed to measure the experience of gaslighting behaviors from the victim’s perspective. They called it the Gaslighting Behavior Experience Questionnaire, or GBEQ. It was validated across two studies with a combined sample of 735 German adults. This is significant not just for researchers. The existence of a validated instrument means we can now put numbers to an experience that has largely lived in the territory of the unspeakable. And the numbers, it turns out, are striking.
Further down in this post is a sample test based on the GBEQ. The GBEQ is the property of the researchers and is not available for free.
What the research found
In Dapperger and Renner’s two studies, approximately two thirds of participants reported having experienced gaslighting at some point in their lives. Of those who had, nearly half reported that it had gone on for several years. This is not a single incident, a bad week, or an isolated argument. For most people who experience it, gaslighting is a sustained exposure, something that happens across hundreds of interactions over months or years, each one individually deniable, collectively devastating.
The most common context was romantic relationships, reported by roughly half of participants in both studies. Family of origin came second, followed by friendships, and then the workplace. What this distribution tells us is something that clinical practice has long suggested: gaslighting happens most where the stakes of the relationship are highest, where the emotional investment is greatest, where the cost of losing the relationship feels unbearable. It is not coincidental that it concentrates in the relationships we are least able to simply walk away from.
The consequences documented across both studies are worth reading slowly. More than half of participants who had experienced gaslighting reported that it led to reduced self-esteem, reduced self-trust, and reduced self-confidence. More than half reported confusion, uncertainty, and doubt as a lasting consequence. More than half reported altered self-perception, feelings of worthlessness, and pervasive self-doubt. Stress symptoms at or above the same threshold. Feelings of guilt. Anger. Mistrust of others. Doubts about their own memory and perception. These are majority experiences among people who have been in gaslighting relationships.
Depression and anxiety were among the most frequently diagnosed clinical conditions following gaslighting exposure. PTSD was also reported. When participants were asked open questions about their stress symptoms, the most common responses were anxiety symptoms, nervousness, restlessness, tension, followed by energy and sleep impairments. A substantial number also reported physical symptoms: gastrointestinal problems, neurological symptoms including migraine and dizziness, and cardiac symptoms including hypertension and heart palpitations. These are the consequences of being systematically told, by someone you trust, that you cannot trust yourself.
Why a questionnaire matters, and what this one does
One of the functions a validated questionnaire serves is not just measurement but recognition. When you read an item that describes, precisely and without ambiguity, something that was done to you, something you may have been telling yourself was your fault, or a misunderstanding, or a reasonable interpretation of events, the effect can be clarifying in the way the word gaslighting itself is clarifying.
The GBEQ was built on a key structural principle: each item describes the gaslighting behavior and includes a reality check, a clarification of what is actually true from the victim’s perspective. This is methodologically important because it reduces false positives. But it is also important for another reason. It says, clearly and in writing: your perception was correct. The item is not asking whether someone said you were imagining things. It is asking whether someone said you were imagining things even though you could trust your own perceptions. The validity of your experience is built into the question itself.
The questionnaire
The tool I am offering below was modelled directly on the GBEQ framework, its item structure, its behavioral categories, its frequency scale, and its reality-check principle. It covers five domains of gaslighting behavior: challenging memory and perception, challenging emotional reactions, challenging personal traits and abilities, denying facts and lying, and blaming. It is 20 items. Each item asks how often a specific behavior has occurred in a relationship of your choosing, a partner, a family member, a colleague, anyone whose behavior has left you questioning your own sense of reality.
This is an orientative tool, not a clinical instrument. It has not been validated against clinical populations, and it is not designed to diagnose anything. What it is designed to do is give you a clearer picture of a pattern, to put language and structure around experiences that are, by their nature, designed to resist being named.
Instructions:
Think of a specific person in your life (a partner, family member, friend, or colleague) whose behavior has left you questioning your own perception of reality. Rate how often each of the following has occurred in this relationship, using the following scale:
Never = 0 · Rarely = 1 · Sometimes = 2 · Often = 3 · Very Often = 4
Category 1: Challenging memory and perception (Someone undermines your ability to accurately remember or perceive events)
This person has told you that something you clearly remember never happened, or happened differently than you recall, even when you were certain of your memory.
This person has suggested that you are imagining things or that your perception of a situation is wrong, even when you had good reason to trust what you observed.
This person has told you that you are going crazy, losing your mind, or being irrational, when in fact your concerns or observations were valid.
This person has denied saying something you clearly heard them say, leaving you to doubt whether the conversation ever took place.
This person has rewritten the history of your relationship or specific events in ways that made you look unstable, unreliable, or wrong, when the record showed otherwise.
Category 2: Challenging emotional reactions (Someone tells you your emotional responses are wrong, excessive, or abnormal)
6. This person has told you that you are overreacting or being too sensitive, when your emotional response was proportionate to what had happened.
This person has dismissed your feelings as irrational, ridiculous, or embarrassing, when you had legitimate reasons to feel the way you did.
This person has told you that no reasonable person would feel the way you do, making you doubt the validity of your own emotional experience.
This person has used your emotional reactions as evidence that something is wrong with you, rather than acknowledging what triggered those reactions.
Category 3: Challenging personal traits, abilities, and values (Someone systematically undermines who you are as a person)
10. This person has repeatedly told you that you are incompetent, stupid, or incapable in areas where you have reasonable confidence in your own abilities.
This person has told you that you are a bad, selfish, or cruel person, when your behavior did not warrant that characterization.
This person has framed your values, beliefs, or principles as flawed, extreme, or wrong in ways that left you questioning your own moral judgment.
This person has told you that people who know you well agree with their negative view of you, in order to make you feel that your self-perception is the problem.
Category 4: Denying facts and lying (Someone consistently misrepresents verifiable reality)
14. This person has denied doing or saying something that you know with reasonable certainty to be true, and has maintained that denial even when confronted with evidence.
This person has told you that things you directly witnessed or experienced did not happen, or offered an alternative version of events that contradicted your direct experience.
This person has given you explanations for their behavior that you knew to be false, and then insisted on those explanations when questioned.
This person has contradicted themselves across different conversations, and when you pointed this out, responded in a way that made you feel you had misunderstood rather than that they had been inconsistent.
Category 5: Blaming (Someone redirects responsibility for their behavior onto you)
18. This person has blamed you for their own hurtful behavior, framing your reactions or actions as the real cause of what they did to you.
This person has consistently positioned themselves as the real victim in situations where you were the one who was hurt, making you feel guilty for raising concerns.
This person has made you feel responsible for maintaining their emotional state to such a degree that you stopped trusting your own judgment about when something was wrong.
A note on what the score means
The questionnaire produces a score between 0 and 80. A higher score indicates more frequent exposure to gaslighting behaviors across more categories. The score bands are orientative:
0–10: Little to no gaslighting indicators in this relationship.
11–25: Some gaslighting behaviors present. Worth paying attention to, especially if they cluster in particular categories.
26–45: Significant gaslighting indicators. This relationship may be affecting your sense of reality in ways that have psychological consequences.
46–80: Severe gaslighting indicators. If you are still in this relationship, the impact on your psychological wellbeing is likely substantial and you must consider protecting yourself firmly.
Want to read more on the types of people who tend to gaslight? Have a look at this free guide HERE.
Alexandra Penescu is a Romanian clinical and forensic psychologist living in Bucharest, Romania. She is also a survivor of complex trauma and a narcissistic family, as well as a survivor of abuse perpetrated by a therapist. She studies psychopathology with a strong tendency towards perpetrators, and works with victims of narcissistic, relational, “therapeutic” and domestic abuse.