What Should You Do When a Child Does Not Say No but Clearly Appears Unwilling to Participate?

What if the child never says no, but everything else suggests they do not want to participate?

A child becomes quiet when the research activity begins. They turn away from the researcher, cling to a parent, refuse to enter the room, pull their arm back from a procedure, or repeatedly avoid answering questions. Yet they never actually say, “No.”

Has the child assented because there was no verbal refusal?

No. Under the U.S. HHS regulations, assent requires affirmative agreement. Mere failure to object cannot, without affirmative agreement, be treated as assent. Behavior that suggests unwillingness therefore deserves attention even when the child never verbalizes a refusal.

The harder question is what that behavior means. Nonverbal behavior can communicate dissent, but it can also reflect fear, confusion, pain, shyness, fatigue, or distress about one particular procedure rather than rejection of the entire study. Researchers need a process for distinguishing these possibilities without simply assuming that silence means yes.

Do not treat the absence of “no” as assent

Nonverbal behavior matters because assent is affirmative

Silence is not assent

HHS regulations define assent as a child's affirmative agreement to participate in research and explicitly state that mere failure to object should not, without affirmative agreement, be construed as assent.

This is a crucial safeguard. A child may remain silent because they believe adults have already decided, because they are uncomfortable disagreeing with a parent, or because they do not know that refusal is possible. Compliance with an adult's instructions does not necessarily communicate willingness.

The same principle applies when researchers obtain both child assent and parental permission. The parent's authorization cannot transform the child's passive behavior into affirmative agreement.

Nonverbal dissent is not one specific gesture

There is no universal behavioral checklist that converts a particular movement into research refusal. Children communicate differently, and the meaning of behavior depends on age, developmental abilities, communication style, context, and what is happening at that moment.

Potential signs of unwillingness might include repeatedly pulling away, refusing to approach the research area, pushing materials aside, turning away, attempting to leave, shaking the head, becoming markedly withdrawn, or resisting a procedure. Crying or visible distress may also require attention.

These behaviors should be treated as information, not mechanically coded as identical forms of refusal.

Distress and dissent can overlap without being identical

A child can want to participate and still dislike part of the experience. A blood draw may frighten a child who remains enthusiastic about the rest of the study. An interview question may cause embarrassment without meaning the child wants to withdraw from every activity.

Conversely, what adults interpret as ordinary nervousness may actually be the child's clearest available way of saying they do not want to continue.

The research team should therefore avoid two extremes: ignoring behavior unless the child says “no,” or automatically interpreting every sign of discomfort as withdrawal from the entire study.

These categories can lead to the same immediate action: pause

Although distress, dissent, and lack of affirmative assent are conceptually different, the safest immediate response to ambiguous unwillingness is often to stop pressing forward long enough to understand what is happening.

Pausing does not necessarily mean permanently withdrawing the child from the study. It creates space to determine whether the child is frightened, confused, needs a break, objects to one procedure, or no longer wants to participate.

Ask the child in a way they can understand

When developmentally appropriate, researchers can gently clarify the child's wishes. Questions should be neutral rather than designed to elicit agreement.

For example, instead of asking, “You're okay to keep going, right?” a researcher might ask whether the child wants to continue, stop, take a break, or have something explained again. The options offered should accurately reflect what the approved protocol permits.

Researchers should adapt the explanation and questions to the child's developmental level. A young child may communicate preference differently from an adolescent.

Do not let the parent answer every question for the child

Parents can provide valuable information about how their child ordinarily communicates fear, discomfort, or refusal. That can be particularly useful for younger children or children with communication differences.

But if the purpose is to determine the child's willingness, researchers should be cautious about replacing the child's response with the parent's interpretation. A parent saying, “She's fine, keep going” does not itself establish affirmative child assent.

When possible and appropriate, communicate directly with the child while using the parent's knowledge to help interpret unfamiliar behavior rather than to erase it.

Do not use physical compliance as evidence of willingness

A child who remains seated, extends an arm after repeated adult instructions, or eventually stops resisting has not necessarily communicated affirmative agreement. Compliance may occur because the child believes there is no alternative.

This matters particularly when adults hold strong authority over the child, including parents, clinicians, teachers, and researchers. The absence of continued resistance should not automatically be converted into assent.

Behavior should be interpreted in relation to the particular activity

Researchers should ask whether the child appears unwilling to participate in the study as a whole or objects to a particular procedure.

For example, a child may willingly complete questionnaires but resist an optional audio recording. If the approved protocol allows participation without that component, the researcher may be able to respect the objection while continuing other activities. If the procedure is essential to participation, the consequences may differ.

Study teams should know these distinctions in advance rather than bargaining with children during data collection.

Children with limited speech still need meaningful opportunities to communicate

Non-speaking or minimally speaking children should not automatically be treated as incapable of expressing preference. Depending on the individual, communication may occur through gestures, augmentative or alternative communication, facial expression, behavior, or other established methods.

The relevant issue is whether the child can meaningfully communicate willingness or unwillingness, not whether they can deliver a conventional verbal answer.

Researchers should work with the IRB and, where appropriate, people familiar with the child's communication to design an assent process that does not mistake speech ability for decision-making ability.

Anticipate behavioral dissent in the protocol

A protocol involving children should ideally explain how researchers will recognize and respond to unwillingness, particularly when the participant population may communicate nonverbally.

This can include who will make the assessment, what behaviors warrant pausing a procedure, how the child will be asked whether they want to continue, when a break may be offered, when participation will stop, and how the event will be documented.

Predetermining these procedures reduces the risk that recruitment goals or pressure in the moment will influence how researchers interpret a child's behavior.

A child pulls away but never says no

The key is not that one head shake has magical regulatory significance. The researcher's conclusion comes from the pattern of behavior, developmentally appropriate clarification, and the child's continued communication of unwillingness.

Compare this with a child who says they want to continue but is briefly frightened by the collection device. That child may need an explanation or a break rather than withdrawal. Context matters.

Common mistakes when children communicate unwillingness behaviorally

Build a response to dissent into the study rather than improvising it

If your participants include children, particularly young children or children who may communicate nonverbally, define how the study team will respond when behavior suggests unwillingness.

Train study personnel using concrete scenarios rather than simply telling them to “respect dissent.” Staff need to know what they are authorized to stop, what they can omit, whom they should contact, and how ambiguous behavior should be escalated.

Also make clear that researchers are not expected to become mind readers. The objective is not perfect interpretation of every gesture. It is to avoid the much more serious mistake of presuming assent when affirmative agreement has not been established.

If the child's behavior becomes a clear refusal and assent is required, the analysis converges with the question of whether a child's refusal prevents participation despite parental permission.

When a child appears unwilling, check before continuing

Frequently asked questions about nonverbal dissent

A child should not have to fight the procedure to communicate unwillingness

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