01 · The Question
What If Nobody Said “You Have To,” but the Participant Still Felt They Had No Choice?
The researcher never threatened anyone.
The consent form clearly said participation was voluntary.
Nobody promised special treatment for joining.
Yet afterward, a participant says, “I didn't really feel like I could say no.”
Was the participant coerced?
Possibly, but not necessarily in the technical research-ethics sense of coercion. The more important first step is to understand what made refusal feel unavailable. A supervisor's authority, a physician's role, a classroom full of participating peers, dependence on services, repeated invitations, or uncertainty about consequences can all create substantial pressure without anyone issuing an explicit threat.
The distinction matters because researchers should take perceived pressure seriously without turning every uncomfortable influence into “coercion.” Identifying what actually produced the pressure helps determine what safeguard is needed.
03 · What You Need to Know
Pressure Can Be Real Even When It Was Never Spoken
Technical coercion and the experience of feeling coerced are not identical
In everyday language, people often use “coerced” broadly to mean pressured, forced, obligated, or unable to refuse.
Research ethics sometimes uses the term more narrowly.
The Belmont Report describes coercion as an overt threat of harm intentionally presented to obtain compliance. Current OHRP guidance includes overt or implicit threats of harm in its explanation of coercion. Undue influence, by contrast, may arise through excessive or inappropriate rewards or other overtures, and OHRP notes that it can also be subtle.
Technical coercion
A threatened harm or adverse consequence is used to obtain compliance.
Feeling coerced
The participant experiences the decision as one they cannot realistically refuse, whether the source is a threat, authority, dependency, social pressure, misunderstanding, or another influence.
The distinction should improve ethical analysis, not invalidate the participant's experience.
If someone says, “I felt coerced,” responding with “Technically, you weren't” misses the useful question: why did the supposedly voluntary choice feel compulsory?
An implicit threat can still be coercion
Researchers should not swing too far in the opposite direction and assume coercion exists only when someone literally says, “Participate or else.”
OHRP includes implicit threats in its explanation of coercion. A consequence may be communicated through context, implication, or conduct rather than an explicit sentence.
Suppose a manager tells employees:
“Participation is voluntary, of course. I just hope everyone remembers how important cooperation is when performance reviews come around.”
The word “voluntary” does little ethical work if the remainder of the statement communicates a workplace consequence.
The absence of an explicit command therefore does not establish the absence of coercion.
Authority can create pressure without threatening anything
More difficult situations arise when no threat, explicit or implicit, can be identified.
A professor asks students to participate. A supervisor invites employees. A physician mentions their own study to a patient. A thesis adviser recruits doctoral students.
OHRP specifically notes that undue influence can be subtle. Patients may feel obligated when their physician is also the investigator, while students may feel pressure when everyone else in a class participates. OHRP also recognizes that employees may worry that participation affects evaluations or advancement even when this is only their perception.
The Belmont Report similarly identifies unjustifiable pressure from people in positions of authority or commanding influence, especially where possible sanctions exist.
This is why recruitment by someone with authority deserves special scrutiny even when their invitation sounds perfectly polite.
Participants make decisions based on what they believe will happen
Imagine that a manager would never penalize an employee for declining research.
The employee does not know that.
The employee knows only that the manager evaluates performance, assigns desirable projects, approves leave, and is now personally asking for participation.
From the manager's perspective, there is no threat. From the employee's perspective, refusal contains uncertainty.
OHRP explicitly recognizes this problem in employee research, noting that free choice may be affected by the possibility that participation influences evaluation or advancement “even if it is only the employee's perception” that this is the case.
This is an important ethical insight: voluntariness cannot be evaluated solely from inside the researcher's intentions.
The setting can communicate an expectation
Consider a professor who displays a QR code during class and says:
“The survey is voluntary. You can complete it now if you want.”
Thirty students take out their phones. Three do not.
Nobody threatens those three students. Yet refusal has become visible to the professor and classmates.
OHRP specifically uses class participation as an example of subtle undue influence, noting that students may feel pressure if everyone else in the class is participating.
The same mechanism can operate in staff meetings, clinical settings, community gatherings, group chats, training sessions, or other environments where participation is socially observable.
Privacy of the decision can therefore be part of voluntariness.
Silence can be difficult when everyone expects cooperation
Research may occur in cultures, institutions, teams, or communities where helping an authority figure or supporting collective activities is strongly valued.
Those norms do not automatically invalidate consent.
But researchers should recognize that a technically optional invitation can become socially costly to refuse when participation is framed as loyalty, cooperation, gratitude, professionalism, or support for the group.
“Everyone is helping” can exert influence even without adding “and you must too.”
Researchers should therefore be careful with recruitment messages that use social expectation as part of their persuasive force.
Repeated invitations can change meaning over time
A first invitation may be entirely appropriate.
A reminder may also be appropriate.
Then comes another message.
“Just following up.”
Then another.
“I noticed you still haven't completed it.”
Then a face-to-face question:
“Did you see my messages?”
No single communication may contain a threat. Together, however, they may tell the recipient that silence is not being accepted as a meaningful response.
The ethical concern becomes stronger when the researcher has an ongoing relationship with the person. Repeated solicitation can gradually transform an invitation into a demand for an explanation.
Ethical recruitment should make declining possible without requiring participants to defend the decision.
Time pressure can feel like compulsion
Potential participants may also feel pressured when they must decide immediately.
“We need your answer before you leave.”
“The study starts in five minutes.”
“Everyone else has already signed.”
HHS regulations require consent circumstances that provide sufficient opportunity to consider participation and minimize coercion or undue influence. OHRP specifically advises IRBs to consider whether potential participants may feel pressured to act quickly or discouraged from seeking advice from others.
Not every study requires days of deliberation. A brief anonymous questionnaire does not necessarily demand the same decision period as a complex clinical trial. But unnecessary immediacy can narrow a person's practical ability to say no.
Dependency can make neutral consequences look threatening
A patient depends on a clinician. A client depends on a caseworker. A student depends on an adviser. An employee depends on a supervisor.
In such relationships, participants may worry about consequences that the researcher considers impossible.
The 2024 Declaration of Helsinki requires particular caution when potential participants are in a dependent relationship with the researcher or may consent under duress. In those medical-research circumstances, informed consent must be sought by an appropriately qualified individual independent of that relationship.
The principle is revealing even beyond settings governed by Helsinki: dependency changes what an invitation can mean.
Feeling pressure does not automatically prove that consent was invalid
Researchers should also avoid the opposite oversimplification.
People can feel nervous about declining without being coerced. They may dislike disappointing someone, find refusal socially awkward, or strongly prefer an incentive. Human decisions are rarely emotionally neutral.
The Belmont Report acknowledges a continuum of influence and explicitly states that it is impossible to identify precisely where justifiable persuasion ends and undue influence begins.
That means there is no simple rule that any subjective discomfort invalidates consent.
The appropriate response is contextual assessment: what generated the feeling, how strong was the influence, what did the researcher control, what did the participant believe would happen, and what safeguards could reasonably have reduced the pressure?
Ask about the counterfactual: what would happen after “no”?
One of the most useful ways to investigate perceived pressure is to stop analyzing the invitation and imagine the refusal.
If the person says no:
- Does the researcher ask why?
- Does the supervisor know?
- Does the professor see who did not participate?
- Does ordinary care continue?
- Do services remain unchanged?
- Does the relationship become awkward?
- Will another invitation arrive tomorrow?
Voluntariness becomes more credible when the answer to refusal is boring.
“Okay, thank you for considering it” is ethically powerful precisely because nothing else happens.
Watch Out
Do not dismiss a participant's report of feeling coerced merely because you cannot identify an explicit threat. First determine what made refusal feel unsafe or unrealistic. The correct ethical label can come afterward.