Kiley Hamlin


Research Classification

Research Interests

Cognitive development
Moral Judgement and Duty or Obligation Morals
Infant / Child Development
Foundations of Religious, Mystical, Mythical and Moral Thoughts
Infant moral cognition
infant social cognition

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Affiliations to Research Centres, Institutes & Clusters


Research Methodology

infancy methods


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Our work focuses on the early development of moral cognition and action in infancy.

I am open to hosting Visiting International Research Students (non-degree, up to 12 months).

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Graduate Student Supervision

Doctoral Student Supervision

Dissertations completed in 2010 or later are listed below. Please note that there is a 6-12 month delay to add the latest dissertations.

The neurobiological bases of infants' sensitivity to sociomoral scenarios (2021)

Human beings show a pervasive tendency to evaluate others based on their sociomoral behaviors. Recently, a growing literature demonstrates that even preverbal infants are sensitive to prosocial and antisocial interactions, suggesting that the rudimentary aspects of sociomoral evaluations may develop early in life (Ting et al., 2020). However, it remains unclear whether infants’ responses to sociomoral interactions are social in nature, and whether affective processes are involved when infants process sociomoral scenes. The current dissertation explores these questions by systematically examining infants’ real-time responses to helping and hindering interactions.In Chapter 1, I provide an overview of evidence for sensitivity to sociomoral scenarios in infancy and discuss how neurophysiological measures can shed light on the nature and mechanisms of this sensitivity. In Chapter 2, I examine how infants process sociomoral scenes by assessing infants’ eye-movement and pupillary responses to helping/hindering interactions using eye-tracking. Through a detailed analysis of infants’ visual attention and pupillary responses, I explore whether infants attend to socially relevant aspects of the displays, whether infants’ online looking behaviors predict social preferences, and whether infants show differential arousal responses to prosocial and antisocial scenarios. In Chapter 3, I examine infants’ neural responses to helping/hindering interactions using electroencephalography (EEG). By investigating whether helping/hindering scenarios and characters elicit differential responses in neural signatures of task-relevant mental processes, I explore whether helping/hindering interactions evoke approach-avoidance motivations and whether socially relevant neural processes are implicated when infants respond to prosocial/antisocial characters. Chapter 4 focuses on infants’ arousal/affective responses to sociomoral scenarios. Using facial electromyography (EMG), I explore whether infants show positive and negative facial responses when viewing helping/hindering scenarios. By assessing infants’ electrodermal activity (EDA) and pupillary responses, I examine whether infants’ arousal levels change in reaction to prosocial/antisocial interactions.Together, the results provide convergent evidence that infants’ responses to helping/hindering interactions are based on socially relevant processes, and that arousal/affective processes are implicated when infants respond to sociomoral scenarios. These findings provide a more holistic account of how different mental processes relate to infants’ sociomoral evaluations, and shed light on long-lasting debates about the nature and mechanisms of early sociomoral functioning.

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Young children's social and moral evaluations of third-party helpers and hinderers (2020)

The judgment of others’ actions as good and praiseworthy versus bad and blameworthy is fundamental to humans’ sociomoral functioning. The ability to produce such moral judgments was traditionally characterized as a relatively lengthy process, requiring years of experience and cognitive maturation. However, more recent research has demonstrated that even infants are sensitive to morally relevant interactions amongst third parties. What remains unclear is whether infants’ implicit sociomoral evaluations align with young children’s explicit moral judgments. This dissertation explores the maturity of preschoolers’ explicit moral judgments when presented with third-party social interactions similar to those used to demonstrate infants’ implicit moral sense. Chapter 1 provides relevant background information regarding the study of moral judgments across infancy and early childhood. Chapter 2 investigates whether infants’ preferences for those who help rather than hinder others’ unfulfilled goals align with preschoolers’ explicit social and moral judgments. Specifically, two experiments explore whether 3- to 5-year-olds selectively prefer helpers, judge helpers as “nicer” than hinderers, and selectively allocate punishment to hinderers across two different scenarios. Chapter 3 examines the extent to which preschoolers’ judgments are sensitive to individuals’ mental states: Three experiments investigate whether 3- and 4-year-olds’ social and moral judgments privilege others’ intentions to help versus hinder a third party or whether judgments are tied to the outcomes achieved. Chapter 4 explores preschoolers’ ability to consider the context in which helpful and unhelpful actions are performed. Specifically, two experiments investigate whether 3- and 4-year-olds differentially evaluate those who help versus hinder previously prosocial or antisocial others. Finally, Chapter 5 discusses the main findings of this dissertation and several open questions regarding the nature of young children’s moral judgments. Together, this dissertation represents a significant advancement in the understanding of young children’s social and moral cognition. By adapting paradigms developed to study implicit sociomoral evaluations, these studies document important similarities and dissimilarities between infants’ implicit moral sense and young children’s explicit morality.

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Foundations of Cultural Learning (2016)

Toacquiretheirlocalculture,infantsmustidentifygoodculturalmodelstolearnfrom.Doingsosuccessfullyrequireslearnerstoevaluateothers’qualitiesaspotentialknowledgesources.Thefollowingbodyofresearchexamineshowtheyoungesthumansidentifygoodsourcesofconventionalbehaviours—adomainofculturalknowledgethatlacksinherentpropertiesforevaluation.Chapter2examinesinfants’preferencesforindividualswhoperformedaconsensusactionvs.anoft-­‐repeatedaction.Resultsrevealedthatpreverbalinfantsarecapableofmakingcomplex,context-­‐dependentevaluations,favouringconformistswhenthetargets’priorknowledgecannotbeassumed,andpreferringmaverickswhenitcan.Chapter3extendstheseresultsbyshowingthatpreschoolagedchildrenusesomeofthesesamecuestoidentifywhomaybegoodtolearnfrom.Chapter4investigatesinfants’useofobservedemotionalcommunicationstochoosebetweensocialandasocialtargets.Culturalanddomaindifferenceswerefoundfor12montholdinfants:targetpreferenceswereinfluencedbyemotionalreactionsdirectedatsocialtargets,butnotbyemotionalreactionsdirectedatasocialtargets.AdifferentialresponsetopositiveandnegativeemotionalreactiononlyreliablyaffectedEuropeanCanadianinfants’choices,butnotEastAsianinfants,norEuropeanandEastAsianmixedinfants.Chapter5investigatedhowparentsconveyevaluativemessagesaboutobjectsduringinteractionswithinfants,andexploredculturaldifferencesinthesepedagogicalinteractions.Resultshintatculturaldifferencesintheamountofvalencecongruent utterancescaregiversmake,resultingindifferentialexperiencewithemotionalcommunicationsasameansoflearningabouttheworld.

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Master's Student Supervision

Theses completed in 2010 or later are listed below. Please note that there is a 6-12 month delay to add the latest theses.

Infants’ neural responses to sociomoral scenarios via EEG (2023)

A growing body of research has shown that preverbal infants prefer prosocial to antisocial characters, suggesting that the ability to sociomorally evaluate others is early emerging. However, some argue that infants’ responses within these studies reflect low-level perceptual processes rather than social understanding of the events. Using electroencephalography (EEG), the purpose of this research was to address this alternative explanation by examining 1) specific neural signatures that have been associated with social (indexing by P400 and N290 ERP components) versus lower-level attentional processing (indexing by Nc ERP component) and 2) motivational processes involved in infants’ prosocial preferences (indexing by frontal alpha asymmetry for approach/avoidance motivation). Thirty-six 6-month-old infants watched a helping/hindering scenario, in which a character tries but fails to open a box, then is alternatively helped or hindered in opening the box lid. Infants showed greater amplitudes in the P400 component as well as greater N290 component over the right hemisphere channels to hinderers versus helpers (indexing social perception); in contrast, no significant differences were observed for the Nc component (indexing attentional allocation). No motivational processes were observed when infants viewed helping versus hindering videos. Overall, our findings provide evidence for the presence of social processes in infants’ responses to sociomoral actors, suggesting that infants’ responses to sociomoral events are unlikely to be attributable to attentional differences.

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Preschooler’s evaluation of authority figures’ third-party punishment of a moral transgression (2023)

Punishment, despite its negative nature, plays a crucial role in fostering cooperation within human society by deterring antisocial behavior and promoting prosocial behavior in long-term social interactions. Although some evidence suggested children would consider the target's previous prosocial or antisocial actions in their socio-moral evaluation (Geraci, 2021; Hamlin et al., 2011; Lee & Warneken, 2020; Loke et al., 2011), some showed they do not (Li et al., 2020; Li & Tomasello, 2018; Van de Vondervoort, 2020). One possible explanation is that children are opposed to punishment from an ordinary citizen who is not in the position to punish. We hypothesize that children may perceive punishment as acceptable when carried out by authority figures. To explore this hypothesis, the present study investigated whether 3- and 4-year-old children would consider the context in which helping and hindering occur in their evaluations when the moral agents were depicted as holding authority status.Contrary to our prediction, both 3- and 4-year-old children negatively evaluated the punishing police officers and positively evaluated the rewarding police officer regardless of whether the target was previously prosocial or antisocial. They preferred the rewarding police officer when asked about liking, the rightness of the action, and identifying the good police officer. We discussed possible reasons for our failure to detect children's context-dependent moral evaluations using the current study design, and proposed future direction to explore this topic. These findings contribute to our understanding of how contextual information influences children's moral judgment about third-party interventions and shed light on the developmental trajectory of children's sociomoral cognition.

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Origins of dehumanization: infants' goal attribution to linguistic in-group and out-group members (2022)

Research in the past two decades has found evidence for dehumanization in both adults and children; however, its developmental origins – that is, whether young infants already possess the tendency to dehumanize others – has yet to be investigated. The present study examined whether 11-month-old infants already dehumanize out-group members by denying out-group others of certain mental states, a common measure of dehumanization in adults and children. To do so, the study examined infants’ attribution of goals, a basic mental state infants readily attribute to human agents. Sixty-two primarily English-hearing infants watched videos in which a female experimenter, either speaking in English or Spanish, reached for one of two objects. At test, the two objects switched places, and infants’ looking times were measured as the experimenter either reached for the same object or a different object. Infants who watched the English speaker were surprised, and thus looked longer, when she reached for a different object, suggesting that they attributed a goal of the original object to the English speaker. By contrast, infants watched both types of reaches equally if they saw the Spanish speaker. Exploratory analyses examined the impact of age and language exposure on infants’ goal attribution to in-group and out-group members. These findings suggest that infants as young as 11 months of age may already show the tendency to deny out-group others of certain mental states. We discuss the implications of these findings as it relates to the nature of dehumanization and the emergence of intergroup bias.

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Do infants prefer prosocial others? A direct replication of Hamlin & Wynn (2011 (2018)

Within the last five years, social sciences, especially psychology, have seen problems with replicability and reproducibility. A growing body of evidence suggests that low powered studies, undisclosed statistical flexibility and lack of pre-specified study standards are all contributing factors to a low rate of replicability. Within the realm of infant social evaluation, a topic of both theoretical interest and empirical controversy, both replications and non- replications exist. Given this, and the movement toward replication in psychology in general, this paper will present results both a pre-registered sample and a larger sample that directly replicates Hamlin & Wynn’s (2011) “box scenario”, which examines whether preverbal infants prefer prosocial to antisocial others. Our pre-registered sample did not replicate the original finding seen in Hamlin & Wynn (2011). However, when including all infants tested in the box scenario, the finding did indeed replicate. Overall, our findings add to the scientific understanding of infant social evaluation and provide an important opportunity to add to the replicability movement.

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Infants' performance on sociomoral evaluation tasks predicts parent report of preschool social functioning (2015)

The present study examined developmental continuity in social functioning from infancy to preschool. Specifically, we examined the relationships between infants’ performance on sociomoral evaluation studies and parent report of their preschool social functioning. Infants’ performance, emotional stability (fuss-out rate), and average habituation rate in moral evaluation tasks were collected. Preschool social functioning was measured through parent-report online scales. The results showed 1) that better performance on infant moral evaluation studies was associated with lower rates of parent report of preschool attention problems, social responsiveness problems, and callousness-unemotional traits, as well as higher rates of parent report of adaptive social skills, 2) that fuss-out rate across infant moral evaluation studies was positively associated with parent report of preschool anxiety, depression, and withdrawal, 3) that the relationships between the performance on infant moral evaluation studies and parent-report preschool functioning were stronger for males than for females, and that 4) these relationships were domain-specific. Together these findings provide preliminary evidence for longitudinal continuity in social functioning from infancy to preschool.

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Ten-month olds' evaluations of accidental and intentional actions (2013)

Mature moral judgments rely on the analysis of both the outcomes of others’ actions and the mental states that drive them. Past research has shown that when there is conflict between outcome and intention, young children rely on outcome information to evaluate others, while older children and adults privilege intention (Piaget, 1932/1965). This suggests that there is a shift from outcome-based to intention-based judgments occurring in development.However, the current study suggests that even 10-month-old infants evaluate moral agents on the basis of their underlying mental states. Infants were presented with puppet shows in which a protagonist was either intentionally or accidentally helped or hindered. Infants were then given a forced choice between the accidental and intentional puppets. Results indicate that infants’ preference for the accidental versus the intentional character differed by condition [χ²(1, N = 60)= 11.28, p
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