Binary Approaches to Incapacity and the Emergence of Assent

Classic approaches to decision-making in bioethics take a binary approach hinging on an individual’s ability to make a decision. Those with decision-making capacity exercise their autonomy. Those without capacity have a decision made on their behalf, according to their best interests (howsoever these are constituted—although, from the perspective of contemporary English law, “best interests” do include a consideration of the views and wishes of the child or adult concerned, and thus arguably move toward the middle ground where these views and wishes can be ascertained). Yet this binary approach risks doing a disservice to those who have some decision-making ability but lack the ability for independent decision-making at all times, either due to immaturity (such as children), fluctuating capacity (such as adults with certain disorders or diseases) or where complex communication is impossible (adults with some disorders of consciousness or sentient animals). Depending on the degree we prioritize a liberal commitment to respecting autonomy in healthcare (and I shall not unpack this challenging question here), this entails finding some way of addressing the perceptions, preferences, and choices of incapacitated people. Various remedies exist, that may be more or less acceptable in one group or another. These include: following antecedent instructions drawn up by the individual; allowing family members to decide on a relative’s behalf or; calling on an experienced professional to make a substituted decision based on the individual’s likely wish. Whatever their merits, these solutions share a common weakness. Even when exercised in good faith, they fail to address the individual’s own current perceptions, and thus are mere approximations of choice. Problems addressing the needs of these groups are evident in clinical practiceFootnote ^{14 ,} Footnote ¹⁵ and are the topic of legal research.Footnote ¹⁶

Assent first emerged as a bioethical concept in the 1977 report by the National Commission for the Protection of Human Subjects of Biomedical and Behavioural Research published in the United StatesFootnote ¹⁷ (hereafter: “National Commission report”). It seems likely that its conceptual roots lie in U.S. tort law, where informed consent was at one time considered to comprise “awareness” and “assent.”Footnote ¹⁸ Assent was recognized in U.S. law in 1983,Footnote ¹⁹ and in EU law in 2014 (European law recognizes, rather than prescribes assent).Footnote ²⁰ This statute is narrowly focused on research with children, but there is a growing body of literature and quasi-regulation in other contexts. Sanford LeikinFootnote ²¹ first proposed that assent might be germane to children’s treatment, and assent has been embraced for this purpose by the American Academy of Paediatrics Committee on Bioethics.Footnote ²² Guidelines for research with adults with impaired capacity include discussions of assent,Footnote ²³ and since 2000 assent has been included as a requirement for research with those lacking decision-making capacity in the Declaration of Helsinki.Footnote ²⁴ Assent has been proposed for treatment decisions with incapacitated adults.Footnote ²⁵ More recently, assent has been discussed in animal researchFootnote ²⁶ and research with patients with disorders of consciousnessFootnote ²⁷ (Table 1).

Table 1. First Appearances of Different Applications of Assent

Despite the widespread invocation of assent, little conceptual work has yet occurred. Indeed, assent may be justified in ways that leave much open to question. For example, in research with children, studies commonly suggest that assent contains elements akin to the need for information, understanding, and voluntariness.Footnote ^{35 ,} Footnote ³⁶These elements suggest a prima facie link with consent, yet raise the question of whether assent is something distinct or just consent by another name (indeed this substitution has been explicit in some, albeit revisionary, accounts of assent).Footnote ³⁷ Assent has now been proposed in very different contexts. We must reflect on how differences in medical treatment and research environments, and a focus on adults or children, affect interpretations of assent (if at all).

Group Benefits of Assent

While assent is proposed for children in treatment settings,Footnote ³⁸ assent is primarily discussed in the context of research. Much of the literature sees refusing assent as a protective mechanism by which children can object to participation in research.Footnote ³⁹ Children may also be motivated to take part in research to help other children,Footnote ^{40 ,} Footnote ⁴¹or later come to appreciate their participation in research as they mature.Footnote ⁴² Potentially, by allowing children’s wishes to be involved in research to be heard, assent may also be viewed as a way to meet this presumed preference of children to participate in non-beneficial research. It may be countered that flaws in children’s understanding render assent of insufficient moral weight to agree to participate in non-beneficialFootnote ⁴³ or higher-than-minimal risk trials.Footnote ⁴⁴ Such arguments are not universally accepted. Anna Westra, Jan Wit, Rám Sukhai, and Inez de Beaufort propose accepting assent in order to facilitate research in children where studies are of exceptional value to children’s health at large.Footnote ⁴⁵ They do so not because they believe assent is a sufficient standard of children’s understanding but because assent will facilitate research that will benefit children as a group. Perhaps perversely, such a view apparently conceives assent as a way to reduce the protection of individual children. Indeed, it chimes with critical views that assent is part of a capture of the child research agenda by commercial concerns of the pharmaceutical industry.Footnote ^{46 ,} Footnote ⁴⁷

Assent has gained prominence at a time when the impact on children of the historical lack of research on children’s medicines is a rising concern.Footnote ^{48 ,} Footnote ^{49 ,} Footnote ⁵⁰ Governments have addressed these concerns by passing laws to incentivize research in children. Incentives to reward drug companies that conduct research in children include valuable extensions to patents. Yet critics note that pharmaceutical studies in children have therefore disproportionately focused on medicines for diseases that are nearing the end of their patent periods, which are rare in children, but common in adults.Footnote ⁵¹ Critics argue that (inasmuch as they experience duress for no benefit) this concession has harmed children as a group. In such a situation assent may be viewed in two ways. Refusal of assent may offer additional protection to children against their exploitation, or, by reducing the barrier of need for consent, assent may represent a concession to drug companies to reduce the difficulties in conducting pediatric trials. While the former position sees assent as protective of the individual child, the latter position can still be justified with reference to group benefits. Thus by taking an explicitly collectivist motivation that focuses on accounts of what is good for children at large, assent may assume a quite different character to a more empowerment-led standard. Indeed, since non-therapeutic research itself is clearly aligned to collective benefits, it is unsurprising that a collectivist case for assent in children’s research can be made out.

Assent in children’s clinical treatment is much less discussed than research, and the putative benefits it offers in this context much less clearly fit the collectivist mold. For example, assent has been argued to protect children’s rightsFootnote ⁵² and/or reflect the intrinsic good of respecting children as persons.Footnote ⁵³ These are concepts that ultimately embrace the broader extension to children of the group benefits adults enjoy (where the prevailing conception of benefit accepts the priority of the good of having a refusal respected over any physical harm arising from refusal). Yet they more clearly confer putative benefit to the child as an individual. This is especially true of the rights justification, given the putative function of rights in protecting the individual from being harmed for the wider good. The small literature focused on assent in the treatment of dementia is silent on the concept of group benefits, but the link between research and collective benefit is, somewhat tenuously—made in the case of dementia research.Footnote ⁵⁴ For example, some contend that research participation allows people with dementia to act altruistically or militates against negative stereotypes of incapacity.Footnote ⁵⁵ These benefits might comfortably be construed as either collective or individual, but tend to be framed as the latter. Given the affinity of non-therapeutic research to a group benefit justification, the rather muted reference to group benefits is interesting. Perhaps it suggests that respect for adults as persons is more firmly entrenched in the bioethical discourse around dementia than similar discourse around children.

Autonomy and Consent

Assent is sometimes argued to respect the nascent autonomy of pediatric populations,Footnote ⁵⁶ although this argument is regularly criticized.Footnote ^{57 ,} Footnote ⁵⁸Nevertheless, since seeking consent is commonly held to be the gateway to autonomy,Footnote ⁵⁹ there is a tellingly close resemblance (in form if not in function) between assent and consent in children’s treatment and research. For example, it is not uncommon for children to be encouraged to sign an “assent form” in a manner that mimics the procedures of seeking consent.Footnote ^{60 ,} Footnote ^{61 ,} Footnote ⁶²

The tripartite model of informed consent holds that valid consent entails a patient: (1) being provided with the information they need to decide; (2) understanding that information; and (3) making a voluntary decision. These elements are all present in the literature on children’s participation in research, and numerous authors model assent on consent.Footnote ^{63 ,} Footnote ^{64 ,} Footnote ⁶⁵ Children’s developmental level varies. Capacity is not simply a corollary of ageFootnote ⁶⁶ and some emphasize that the way the information, understanding, and voluntariness manifest can vary from one child to the next.Footnote ⁶⁷ While this lends a certain ambiguity to the presence or absence of assent, many reject the notion that assent is simple affirmation without understanding.Footnote ^{68 ,} Footnote ⁶⁹Moreover, dissent in research is often held to warrant an outright veto.Footnote ⁷⁰ Whatever we decide the exact parameters of dissent are (and I have already noted it shall not be discussed here), the power of dissent suggests that, in children’s research, while informedness and understanding may wax and wane from child to child, the requirement for voluntariness is a unifying feature of assent. In contrast, an absolute position on voluntariness and dissent is absent from discussions of children’s treatment. The same author on occasion will state expressions of dissent should be determinative while accepting that dissent to treatment might be overridden if it carries a risk of harm.Footnote ⁷¹ One small empirical study suggested practitioners’ motivation for gaining assent to treatment may be to gain the cooperation of the child and avoid litigation.Footnote ⁷² One may speculate that such a focus may further weaken attention to providing information and securing understanding. Thus, the force of voluntariness in assent may be weakened by attention to preventing harm and, in some cases, shifted further to preventing harm to the practitioner, perhaps at the cost of other consent-like elements.

Those who argue for assent in dementia treatment do not generally attempt to differentiate it from assent in dementia research contexts.Footnote ^{73 ,} Footnote ⁷⁴In this small literature perhaps more than any other, assent lacks conceptual clarity or rigor. Sometimes assent in dementia research is implied to rest on similar grounds to consentFootnote ⁷⁵; in others assent and consent are not clearly differentiated from one another.Footnote ⁷⁶ In common with children’s assent, the form of consent and assent can be similar, with some authors suggesting that the person with dementia should formally sign assent documentation.Footnote ⁷⁷ Partial understandingFootnote ⁷⁸ and lack of objectionFootnote ⁷⁹ have corollaries with the “understanding” and “voluntary” elements of consent. While being distinctive ideas, they are suggestive of a common inspiration. Nevertheless, the broad thrust of the literature is suggestive of autonomy as a broader concept. Echoing Gerald Dworkin’s influential definition of autonomy as authenticity plus independence,Footnote ⁸⁰ emphasis has been placed on establishing that the assent or dissent of people with dementia expresses an “authentic” choice.Footnote ⁸¹ Authenticity may be established in two ways: through attention to past values and preferencesFootnote ⁸² and through ongoing social engagementFootnote ⁸³ between researcher and participant. Engagement teaches the researcher how persons with dementia behaves when their level of well-being is high, and thus indicates their level of comfort which may otherwise not be self-evident.Footnote ⁸⁴ Jan Dewing urges caution when giving attention to past values and preferences because these may devalue the status of the person with dementia in the present.Footnote ⁸⁵

Despite the centrality of authenticity, it can be difficult to determine in dementia. One study noted that the conversations that people with dementia had with clinicians were skewed toward statements of agreement and approval.Footnote ⁸⁶ People with dementia may be aware of their cognitive impairment and engage in face-saving behaviors that hide their lack of understanding.Footnote ⁸⁷ Family members can have difficulty interpreting the wishes of close relatives with dementia,Footnote ⁸⁸ while professional caregivers may ignore obvious misunderstandings to save the person with dementia embarrassment.Footnote ⁸⁹ Gauging authenticity may therefore be challenging in practice. Notwithstanding Dewing’s reservations about devaluing the present person, if there are no overt objections from a person with dementia, it may be impossible to avoid an emphasis on past wishes. Under these circumstances attempts to impute the person with dementia’s competent response call to mind some aspects of substituted decision-making, which has been conceived to mean a decision based upon past wishes, presumed current wishes, and best interests.Footnote ⁹⁰ Substituted decision-making has a somewhat contested relationship with autonomy,Footnote ⁹¹ a topic I will return to in due course.

Education

Assent in children’s research and treatment is argued to have a developmental, or educational, component.Footnote ^{92 ,} Footnote ⁹³LeikinFootnote ⁹⁴ argues that encouraging children to assent to treatment develops the future adults’ ability to give adequate consent. Less eruditely, one study reported that clinicians view assent to treatment as an obligation to “educate” children about the procedure they would undergo.Footnote ⁹⁵ The same group of clinicians saw assent as a way to gain children’s cooperation. Information tailored toward cooperation may differ from information given for its own sake. This differs from the longer-term goals cited in discussions of assent to research. Therein it has been argued that assent teaches children that choices should be respected.Footnote ⁹⁶ Potentially in variance to this, Amanda Sibley, Andrew Pollard, Raymond Fitzpatrick, and Mark SheehanFootnote ⁹⁷ distinguish this perceived educational property of assent from developing a child’s autonomy. Their argument for this is that what is best for a child overall may be stripped away from the child’s right to be taught to make optimal decisions. Clearly, if teaching children to make decisions is a good in itself, it need not improve the child’s welfare to be morally valid. Nevertheless, even divorced from the child’s overall welfare, education implies a developmental (or perhaps a teleological) goal. Thus education may be about both developing future reasoning, current understanding, or engendering a particular attitude.

It is important to reflect on a more general message the emphasis on what education says about assent. Such goals allow a new perspective on the earlier question of assent and consent, since developmental goals clearly reflect the widespread view that children are “becomings.” Under this view, childhood is a stage where children prepare for adulthood, and this preparation entails a separation between the adult world and the world of children.Footnote ⁹⁸ Assent for children thus could be seen as separated from consent, not because it has separate processes or purposes, but because assent is the way we demonstrate the difference between child and adult interactions with the adult world. Indeed, such an analysis is supported by the absence of an educational justification for assent in people with dementia.

Conceiving assent as a separate, child-centered standard may be viewed positively, as it allows children to assert their views as children, without a need to conform to adult norms or standards. However, this overlooks the fact that assent is itself devised from an adult perspective. Such a perspective stems from an adult view of what children are, how they think, and what they are capable of. If assent requires lower standards of understanding, different types of information, or has specific developmental aims, this firmly casts assent as a vehicle of adult expectations rather than childrens’ capabilities. Considering children’s participation in research, Rachel Balen, Eric Blyth, Helen Calabretto, Claire Fraser, Christine Horrocks, and Martin Manby note that a real danger is that adult expectations of children’s thinking and understanding may be mistaken.Footnote ⁹⁹ Seeking assent may hardwire our expectations that children will warrant education, since they will have less experience, and thus make poorer decisions, than adults. Such expectations may not represent a universal truth.

Promoting Paternalistic Welfare and Preventing Harm

The conception of children’s assent in the 1977 National Commission reportFootnote ¹⁰⁰ indicates assent initially had an explicitly paternalistic welfare function. Contemporary commentFootnote ¹⁰¹ indicates that the committee was impressed by the argument that assent should be part of a protective function that ensured children’s best interests were not being compromised by their involvement in research. Far from a child’s welfare being synonymous with their parents’ views, the language of the report speaks of seeking parental “permission,” rather than consent, suggesting that parents were not to be seen as exercising proxy autonomy. Rather, assent was to involve researchers and parents jointly determining a child’s welfare, on the basis that each had an independent motivation to both protect (as well as empower) the child. Some recent discussions of assent remain concerned that differences in the views of the parent and the child may lead to the child’s disempowerment.Footnote ¹⁰² If parents and the researcher/clinician share responsibility for interpreting assent, this implies a limitation of both parental and clinical authority, and offers both a right of veto. A parent and professional veto seems to confirm that sharing authority is focused on the paternalistic promotion of welfare rather than a child’s empowerment. A child cannot veto the veto: offering a dissent-based veto to a child cannot empower a child to decide her or his own welfare. Indeed, if a child’s dissent is overruled, her or his unequal standing in the decision-making process is further compounded.

Perhaps this is why paternalistic welfare promotion is rarely linked to assent outside these early discussions (albeit paternalism per se, especially as exercised by a parent in a pediatric context, is often viewed as appropriate in many cases) and respecting children’s dissent to prevent harm is much more commonly argued. As noted above, many authors argue that dissent should constitute an unambiguous veto, at least in a research context.Footnote ^{103 ,} Footnote ¹⁰⁴The scope of dissent in treatment decisions is more fluid. It is plausible to argue that welfare benefits flow from having control over a decision.Footnote ¹⁰⁵ If dissent may be overridden, it is less clear whether benefits flow from having a say but partial or no control over a decision. It has been suggested that the pretense of consultation in a decision may be more detrimental than no consultation at all.Footnote ¹⁰⁶ Indeed, the insidious effects of learned helplessness have been well documented in numerous contexts.Footnote ¹⁰⁷ While protections appear to flow from respecting dissent, respecting dissent incompletely has the potential to cause significant harms.

Emphasis on prevention of harm using dissent is repeated in the dementia literature, and here there is less equivocation about the finality of dissent. While there is some suggestion in treatment contexts that clinicians have a paternalistic welfare role that expressly limits the decision-making authority of families over relatives with dementia,Footnote ^{108 ,} Footnote ¹⁰⁹in general, it is the case that dissent is seen to be a more powerful guide to withdrawal from research or treatment than assent is a guide to participation.Footnote ^{110 ,} Footnote ¹¹¹

Critiquing the Possible Justifications for Assent

The discussion above shows a number of justifications for assent. Justifications based on what could broadly be construed as “autonomy” were found in every context (all or most elements of consent were suggested as properties of assent). Avoiding harm by respecting dissent, was found in all but dementia treatment contexts. A paternalistic welfare basis where assent was subject to the shared interpretation of clinicians/researchers was found in research with children and in treatment contexts with children and people with dementia. Justification of assent as educative was found in treatment and research contexts with children but not with people with dementia. Finally, group benefits are used to justify assent only in research with children (Table 2).

Table 2. Recurring Justifications for Assent

These findings underline questions about the ability of assent to offer a consistent approach. This is true both within specific groups when the weight given to particular justifications may cause the approach to differ and when it is used across disparate groups and circumstances. An example of the first instance is assent in children’s research. An emphasis placed on assent as autonomy places a high bar on the understanding and agency of the child who is approached in every case, while an emphasis on assent as educational instead emphasizes the essentially contingent nature of their assent, given its only basis is to teach when we can be certain the child’s decision does not matter. A greater weight given to dissent may grant the power of veto to children even if they do not understand what they are vetoing. An emphasis on paternalistic welfare may allow a researcher to veto the child’s research participation even if the child and their parents strongly disagree. Depending on the exact nature of the group benefit sought and their cost to the individual, an emphasis on group benefit potentiates considerable individual harm even if a child’s understanding is poor or they have little agency. This problem is not an absolute one—any or all of these choices may potentially be used in morally justifiable ways. Yet they may just as easily be used in ways that are not justifiable, for instance, to increase the convenience of a third party such as a family member or a practitioner (for example, by ignoring a child’s dissent because a parent insists on treatment) or to advance an interest of a researcher (for example, by accepting an assent to research where uptake is low and time is short, even though it is clear that the participant has no understanding of what she or he assents to). Such abuses may be unavoidable if they arise from misconduct. However, the threads of justification for assent are sufficiently diverse that there is also scope for a variety of good-faith understandings. While allowing enough scope for discretionary response to unique circumstances is undoubtedly a good thing, without an underlying and coherent justification for assent the range and scope of responses may be too wide. Assent may be an instance where anything goes: Indeed the rich tapestry of interpretations suggests that assent may easily articulate a spectrum of (potentially) justifiable paternalistic and unjustifiable coercive ends, since no such end will encounter a firm conceptual obstacle.

In the face of these problems, it is tempting to cut the Gordian knot and return assent to its natural limits. In the next section, I will explore the suggestion that there is a natural context and motivation for assent. In at least one of these contexts, I suggest we might at last make more of what is an increasingly attractive idea—the extension of the benefits of autonomy to those who hitherto have been denied them.

Contextually Appropriate Homes for Assent

In any reading of the assent literature, it is impossible to ignore the relationship between assent and legal standards of consent for children. Assent is held by many authors as a moral device to enhance legal provisions,Footnote ^{112 ,} Footnote ^{113 ,} Footnote ¹¹⁴ yet the legal rights of children to consent can and do vary from one jurisdiction to another. Priscilla AldersonFootnote ¹¹⁵ has identified assent with U.S. culture. Her concern is that a wholesale importation of assent from the United States to other jurisdictions, as has taken place in UK research, may distort their national approaches toward the rights of children.Footnote ^{116 ,} Footnote ¹¹⁷Alderson’s attention to context is instructive: Given the apparent interpretability of assent, a context-sensitive approach to background conditions may be justified.

This explicit differentiation of the ethical nature of assent from the legal context suggests that the concept of assent can be implicitly linked to a liberalization of the U.S. legal approach to children’s consent. U.S. law confers the right to consent on “mature minors”—children above a threshold age (which varies between states) who are alienated from their parents. However, while often some or all minors can independently consent to a narrow range of care and treatment,Footnote ¹¹⁸ where parents are not alienated from their children the parents, rather than their child, retain a right to consent to the bulk of treatment. This position is rather different from the English common law position.Footnote ^{119 ,} Footnote ¹²⁰ Alderson argues this grants children of all ages significant rights to consent whatever their relationship with their parents, provided a child is judged competent to make decisions. English law in this area is, however, complex and somewhat incoherent,Footnote ¹²¹ containing as it does a peculiar situation where children can consent but not refuse, treatment. UK practitioners may already be unclear about the legal position in many situations involving children’s consent,Footnote ¹²² and the range of justifications for assent may sow further confusion. There appears similar potential for complications on the European mainland.Footnote ¹²³

While bespoke tailoring of assent for particular U.S. contexts may create problems for its cogency in other areas, it does suggest a solution to the possible muddle of concepts and situations we currently find attached to assent. Assent for children seems in the U.S. context to be a candidate for doing the work we would otherwise expect of the United Nations Convention on the Rights of the Child (UNCRC)Footnote ¹²⁴ performs in other contexts. The UNCRC seeks to balance the best interests of the child (Article 3) and a right to participation (Article 12). Moreover, in discussing children’s welfare as “a primary” concern, the language of the convention itself was intended to allow a balance between the rights of parents and siblings (and wider society) and the rights of the child.Footnote ^{125 ,} Footnote ¹²⁶ The UNCRC has not been ratified in the United States, and much of the critique inimical to children’s rights emanates from U.S. scholars.Footnote ^{127 ,} Footnote ^{128 ,} Footnote ^{129 ,} Footnote ¹³⁰ The strands of autonomy, harm, paternalistic welfare, and group benefit found within many of discussions of assent seem to make similar attempts to balance the rights of parents, the rights and welfare of individual children, and the rights and welfare of children at large. Perceiving assent in this way depends on defining assent in particular ways, which may not be acceptable to all commentators. Most glaringly, it relies on a rejection of Sibley, Pollard, Fitzpatrick, and Sheehan’s contention that the aims of assent can be stripped away from the child’s best interests.Footnote ¹³¹ Yet, potentially, this claim is influenced by local culture, emanating as it does from an English institution where the different legal standing of children will affect the types of justification that are offered for assent.

If this analysis is correct, then a cogent way to view children’s assent might be as a specific doctrine that answers some dilemmas about children’s rights in the United States. Seeking assent may therefore be justified in treatment and research decisions in the United States, while being an imperfect fit for the problems of treating and doing research with children elsewhere. In other jurisdictions, children will suffer their own distinctive constellations of inattention, abuse, and oppression that may be better addressed in other ways. This draws into question the need for assent in contexts where the UNCRC has been more influential on the law. This is certainly the case in English Law where the Children Act 1989 gives effect to many of the provisions of the UNCRC. Although the situation is not perfect,Footnote ¹³² the UNCRC is increasingly affecting policy-making throughout the UK.Footnote ¹³³

This analysis of assent in children sees assent as a parochial concept and raises questions about whether assent is fit for other populations. This seems a contentious end for assent. Many find assent an intuitively attractive way to advance liberalism in healthcare, perhaps because it seems to offer the prospect of extending the autonomy of individuals in marginalized and overlooked populations. Although the context of dementia is different, it may ultimately guide us to a place for assent more in keeping with this liberating agenda. There is a developing international approach to the problems of the binary approach to incapacity. The emphasis on judging the authenticity of the assent of a person with dementia raises questions about the place and validity of a substituted decision-making approach. Such approaches have been defended, largely due to the relative unacceptability of alternatives.Footnote ^{134 ,} Footnote ¹³⁵Despite such pragmatic arguments, substituted decision-making faces a mounting critique, having been roundly condemned by the U.N. Committee on the Rights of Persons with Disabilities (CRPD) because of their potential to thwart the rights and actual preferences of people with disabilities.Footnote ¹³⁶ The tendencies to disvalue the current experience of a disabled person over their past preference, to perceive we know a person better than we actually may,Footnote ¹³⁷ or to over-extrapolate from distant events, have been argued to make substituted decisions speculative and their truth-value theoretically problematic.Footnote ¹³⁸ The CRPD claims the better alternative is supported decision-making, where a person who has difficulties in understanding, making, or communicating a decision is given adequate help and resources to overcome these difficulties. A commitment to supported decision-making raises a host of questions, including how it should apply to those people whose level of decision-making ability is extremely low. Supported decision-making approaches are under-researched and far from being fully operationalized.Footnote ¹³⁹ Yet it is impossible to ignore the potential for assent to complement such an approach in treatment and research decisions. Perhaps then, attempts to spread the solicitation of assent in dementia research and practice should find common causes with the quest to develop robust solutions to supported decision-making. Indeed, a more radical claim, prompted by the connection assent highlights between children and incapacitated adults, is that both children and adults should benefit equally from the move away from blanket judgments of capacity and incapacity to receive similar attention to their liberty and welfare. This could build on the potential of supported decision-making to enhance autonomy, offering support based on need, irrespective of whether a person is a child, has dementia, or is an otherwise competent adult struggling with a particular decision.

Assent should be regarded as part of a global movement that, however imperfectly, has taken faltering steps toward these possibilities; indeed, recent attempts to apply assent to the treatment of animals are likely to strengthen this analysis. That these steps have resulted in an unfinished and potentially inconsistent concept highlights the urgent need to develop coherent theoretical foundations to meet the shared dilemmas we encounter when we dissolve the walls between capacity and incapacity. Such an accomplishment may allow assent to fulfill its intuitive promise.