Infant Research Research Articles

Coregistration of EEG and eye-tracking in infants and developing populations.

Infants cannot be instructed where to look; therefore, infant researchers rely on observation of their participant's gaze to make inferences about their cognitive processes. They therefore started studying infant attention in the real world from early on. Developmental researchers were early adopters of methods combining observations of gaze and behaviour with electroencephalography (EEG) to study attention and other cognitive functions. However, the direct combination of eye-tracking methods and EEG to test infants is still rare, as it includes specific challenges. The current article reviews the development of co-registration research in infancy. It points out specific challenges of co-registration in infant research and suggests ways to overcome them. It ends with recommendations for implementing the co-registration of EEG and eye-tracking in infant research to maximise the benefits of the two measures and their combination and to orient on Open Science principles while doing so. In summary, this work shows that the co-registration of EEG and eye-tracking in infant research can be beneficial to studying natural and real-world behaviour despite its challenges.

Variability in infant social responsiveness: Age and situational differences in attention-following

Attention following (AF) is a cornerstone of social cognitive development and a longstanding topic of infancy research. However, there is conflicting evidence regarding the development of AF. One reason for discrepant findings could be that infants’ AF responses do not generalize across settings, and are influenced by situational factors. Theories of AF development based on data collected in laboratory paradigms might skew our understanding of infants' everyday AF. To reveal more generalizable patterns of infant AF development, we compared healthy, North American infants' (N = 48) AF developmental trajectories between a controlled laboratory paradigm and a naturalistic, home-based, parent-directed paradigm. Longitudinal micro-behavioral coding was analyzed to compare individual infants' AF between the two settings every month from 6 to 9 months of age. We aimed to (1) examine longitudinal development of infant AF in two settings; (2) compare AF development between settings, and (3) explore differences in adult cueing behaviors that influence AF. We found that longitudinal trajectories of AF differed between home and lab, with more AF at home in earlier months. Additionally, AF at home was related to maternal cueing variables including bid duration and frequency. These results have implications for the assessment of infants' developing social attention behaviors.

Social motivation predicts gaze following between 6 and 14months.

Infants vary in their ability to follow others' gazes, but it is unclear how these individual differences emerge. We tested whether social motivation levels in early infancy predict later gaze following skills. We longitudinally tracked infants' (N=82) gazes and pupil dilation while they observed videos of a woman looking into the camera simulating eye contact (i.e., mutual gaze) and then gazing toward one of two objects, at 2, 4, 6, 8, and 14months of age. To improve measurement validity, we used confirmatory factor analysis to combine multiple observed measures to index the underlying constructs of social motivation and gaze following. Infants' social motivation-indexed by their speed of social orienting, duration of mutual gaze, and degree of pupil dilation during mutual gaze-was developmentally stable and positively predicted the development of gaze following-indexed by their proportion of time looking to the target object, first object look difference scores, and first face-to-object saccade difference scores-from 6 to 14months of age. These findings suggest that infants' social motivation likely plays a role in the development of gaze following and highlight the use of a multi-measure approach to improve measurement sensitivity and validity in infancy research.

Infants’ Prediction of Humanoid Robot’s Goal-Directed Action

Several studies have shown that infants anticipate human goal-directed actions, but not robot’s ones. However, the studies focusing on the robot goal-directed actions have mainly analyzed the effect of mechanical arms on infant’s attention. To date, the prediction of goal-directed actions in infants has not yet been studied when the agent is a humanoid robot. Given this lack of evidence in infancy research, the present study aims at analyzing infants’ action anticipation of both a human’s and a humanoid robot’s goal-directed action. Data were acquired on thirty 17-month-old infants, watching four video clips, where either a human or a humanoid robot performed a goal-directed action, i.e. reaching a target. Infants looking behavior was measured through the eye-tracking technique. The results showed that infants anticipated the goal-directed action of both the human and the robot and there were no differences in the anticipatory gaze behavior between the two agents. Furthermore, the findings indicated different attentional patterns for the human and the robot, showing a greater attention paid to the robot's face than the human’s face. Overall, the results suggest that 17-month-old infants may infer also humanoid robot’ underlying action goals.

Studying hot executive function in infancy: Insights from research on emotional development

Recent calls have urged to bridge the fields of emotional and cognitive development to advance theoretical and empirical pursuits. Yet, despite notable overlap between research on executive function and emotion regulation, a uniting theory that informs future avenues of research is lacking. Infants are known to lack emotion regulation skills, as they are developing the abilities to regulate their emotions and coordinated responses. However, the field of emotional development demonstrates that at an early age, infants are adept at regulating their behaviors in response to others emotional reactions. Moreover, although classic delay of gratification tasks are fairly ecological measures, rarely are rules expressed to infants without emotions. This paper draws from recent interest in hot executive function to link infancy research on executive function and emotion. Hot executive function lends itself as a useful construct in this endeavor because it unites the study emotion and executive function. We offer a perspective that refines hot executive function within prominent emotion theories while discussing infant executive function and emotion empirical pursuits. Our perspective presents reliable paradigms from the field of emotional development to serve as tools for studying the development of hot executive function.

Simplicity and validity in infant research

Infancy researchers often use highly simplified, animated, or otherwise artificial stimuli to study infant’s understanding of abstract concepts including “causality” or even “prosociality”. The use of these simplified stimuli have led to questions about the validity of the resulting empirical findings. Do simplified stimuli effectively communicate abstract concepts to infants? Even if they do, why not use stimuli more like what infants encounter in their everyday lives? Here we make explicit the underlying logic of using simplified stimuli in studies with infants: Simplified stimuli allow for stronger experimental control and therefore more precise inferences compared to more complex, uncontrolled, naturally occurring events. We discuss the inherent tradeoff between measurement validity and ecological validity, offer three strategies for assessing the validity of simplified stimuli, and then apply those strategies to the increasingly common use of simplified stimuli to assess the development of complex social concepts in the infant mind. Ultimately, we conclude that while concerns about the validity of experiments using simplified stimuli are founded, results from such studies should not be dismissed purely on ecological grounds.

We need to talk about validity - A commentary on "Six solutions for more reliable infant research" from the viewpoint of an early executive functions researcher.

Considering measurement reliability and effect sizes is important for robust infant research and for optimising infant tasks to measure group-level effects or individual differences.Construct validity - making sure that we measure what we think we are measuring - is also important.A robust effect at the group-level may not always restrict reliability - it depends on the amount of true variation between infants.

On the reliability of reliability estimates in infancy research

AbstractIn this commentary on Byers‐Heinlein, Bergmann, and Savalei's (this issue) call to consider reliability in infancy measures, we note that the combination of highly unreliable measures and typically small sample sizes means that most reliability estimates based on single infant studies are, themselves, highly unreliable. To achieve reasonably precise reliability estimates requires either high population reliability or sample sizes several orders of magnitude larger than those typically seen in infancy research. Thus, we caution researchers to always report CIs around reliability estimates, and to be circumspect when interpreting those estimates.

Valid points and looks: Reliability and validity go hand‐in‐hand when improving infant methods

AbstractIn this commentary, we suggest that infancy researchers should carefully consider validity when taking steps to improve reliability. Zooming in to focus on looking‐time methods, we argue that limitations in validity represent perhaps an even more fundamental issue than reliability. At the same time, focusing single‐mindedly on reliability comes with two possible pitfalls: maximizing reliability at the expense of construct validity, and overvaluing parental report measures compared to direct measures of infant behaviour. Finally, we articulate several promising avenues for improving validity in infant research: experimental and modelling efforts to characterize the functional relationship between measures such as looking time and infant cognition, using multiple measures to establish convergent validity, and improving our understanding of how measures vary across a broader set of stimulus characteristics.

Infancy researchers need to change the way they develop their measures: A comment on Byers‐Heinlein et al. (2021)

AbstractIn their article, Byers‐Heinlein et al. (2021) propose six solutions to create more reliable measures for infancy research. Whereas some of their solutions focus on changing the culture in the field (reporting on reliabilities, choosing measures based on psychometrics instead of conventions or face validity, conducting research on psychometrical qualities of measures), other solutions directly relate to the implementation of tasks or data analysis (collecting additional data, exclusion of unreliable trials, more sophisticated analyses). In this commentary, we highlight challenges in the assessment of measurement reliability and why the characteristics of current measures in infancy research make it difficult to add additional trials as suggested by Byers‐Heinlein and colleagues. We then propose how the field of infancy research could move forward by changing (1) the way measures are developed and (2) what kind of measures are developed.Highlights Different types of measures require the calculation of different types of reliability: retest reliability, parallel test reliability or internal consistency. Increasing internal consistencies by the addition of trials is often not feasible. The collaborative development of standardized measures improves measurement reliability, increases the replicability of results and fosters comparability across studies. Instead of measures with few trials of long duration, infancy researchers should make use of technological advances and develop measures that operate on shorter time scales.

Attachment-based parent\u2013adolescent interaction linked to visual attention and autonomic arousal to distress and comfort stimuli

In infancy and in the early years of life, emotion regulation and attachment relationships with parents are tightly intertwined. However, whether this link persists into adolescence has not yet been established and requires exploration. This pilot study utilizes an experimental design to assess the patterns of parent–adolescent interactions that are hypothesised to be related to two specific aspects of adolescents’ emotion regulation, namely: visual attention and autonomic arousal to distress and comfort stimuli. Two innovative and ecologically valid methodologies were utilized to assess (a) patterns of attachment-based parent–adolescent interactions among 39 adolescent–parent dyads from the general population, using the Goal-corrected Partnership in Adolescence Coding System (Lyons-Ruth et al. Goal corrected partnership in adolescence coding system (GPACS), 2005) applied to a conflict discussion task; (b) the two aspects of adolescent emotion regulation were assessed with the Visual/Autonomic Regulation of Emotions Assessment (VAREA) (Vulliez-Coady et al. Visual/Autonomic Regulation of Emotions Assessment, VAREA) paradigm, an attachment-related, emotionally arousing experimental procedure, using a distress-then-comfort paradigm, in conjunction to an eye-tracker synchronized with a physiological device that measured gaze and skin conductance response, (SCR), or emotional reactivity. In line with research in infancy, as predicted, markers of secure parent–adolescent interaction were linked to higher amplitude of SCR for distress and comfort pictures, and with longer attention to comfort pictures. On the other hand, parental role-confusion was associated with less time spent on comfort pictures by the adolescent. Overall, this pilot study suggests that interventions supporting collaborative communication between adolescents and their parents, as well as working to reduce parental role-confusion, may improve adaptive adolescent emotion regulation as assessed via physiological measures.

Commentary on six solutions: Moving forward with measurement in mind

AbstractIn their target article, Byers‐Heinlein, Bergman and Savalei describe the neglected challenge of measurement reliability in infancy research. In this commentary, we elaborate on the problem of measurement reliability and demonstrate the problem it poses when using looking time measures to assess individual differences in infancy. We endorse the solutions Byers‐Heinlein et al. propose to increase measurement reliability. In particular, we encourage the field to develop more reliable measures of individual differences infant looking time.

Eye-tracking-based experimental paradigm to assess social-emotional abilities in young individuals with profound intellectual and multiple disabilities.

Individuals with Profound Intellectual and Multiple Disabilities (PIMD) experience a combination of severe cognitive and motor impairments frequently associated with additional sensory deficits and numerous medical disorders. The purpose of the present study was to propose an experimental paradigm based on eye-tracking that combines various pre-existing tasks from infancy research as an assessment tool. This would enable the investigation of social-emotional abilities in nine young individuals with PIMD through their visual preferences for different types of stimuli. The first objective was to test the feasibility of this paradigm, by expecting individuals to look more at the tasks’ presentation screen than elsewhere during its implementation. The second objective was to investigate whether PIMD individuals exhibit visual preferences for (a) biological (vs. non-biological) motion, (b) socially salient (vs. non-social) scenes, (c) the facial area of the eyes (vs. the mouth), (d) happy (vs. angry) faces, (e) objects of joint attention (vs. non-looked at ones), and for (f) prosocial (vs. anti-social) behaviors similar to those of a control group of typically developing children aged two years on average. Overall, the feasibility of this paradigm proved to be good, resulting in high individual looking rates that were not affected by the presentation or the content of the tasks. Analyses of individual social-emotional abilities, supported by the visual preference patterns of each PIMD individual, firstly revealed strong—but expected—variability both within and between subjects, and secondly highlighted some individual task-specific abilities although few similarities between these individual results and those of the control group were found. These findings underline the great relevance of using this type of paradigm for assessing PIMD individuals and thus contribute to a better understanding of their social and emotional development.

Using machine learning to understand age and gender classification based on infant temperament.

Age and gender differences are prominent in the temperament literature, with the former particularly salient in infancy and the latter noted as early as the first year of life. This study represents a meta-analysis utilizing Infant Behavior Questionnaire-Revised (IBQ-R) data collected across multiple laboratories (N = 4438) to overcome limitations of smaller samples in elucidating links among temperament, age, and gender in early childhood. Algorithmic modeling techniques were leveraged to discern the extent to which the 14 IBQ-R subscale scores accurately classified participating children as boys (n = 2,298) and girls (n = 2,093), and into three age groups: youngest (< 24 weeks; n = 1,102), mid-range (24 to 48 weeks; n = 2,557), and oldest (> 48 weeks; n = 779). Additionally, simultaneous classification into age and gender categories was performed, providing an opportunity to consider the extent to which gender differences in temperament are informed by infant age. Results indicated that overall age group classification was more accurate than child gender models, suggesting that age-related changes are more salient than gender differences in early childhood with respect to temperament attributes. However, gender-based classification was superior in the oldest age group, suggesting temperament differences between boys and girls are accentuated with development. Fear emerged as the subscale contributing to accurate classifications most notably overall. This study leads infancy research and meta-analytic investigations more broadly in a new direction as a methodological demonstration, and also provides most optimal comparative data for the IBQ-R based on the largest and most representative dataset to date.

Comparing Online Webcam- and Laboratory-Based Eye-Tracking for the Assessment of Infants' Audio-Visual Synchrony Perception.

Online data collection with infants raises special opportunities and challenges for developmental research. One of the most prevalent methods in infancy research is eye-tracking, which has been widely applied in laboratory settings to assess cognitive development. Technological advances now allow conducting eye-tracking online with various populations, including infants. However, the accuracy and reliability of online infant eye-tracking remain to be comprehensively evaluated. No research to date has directly compared webcam-based and in-lab eye-tracking data from infants, similarly to data from adults. The present study provides a direct comparison of in-lab and webcam-based eye-tracking data from infants who completed an identical looking time paradigm in two different settings (in the laboratory or online at home). We assessed 4-6-month-old infants (n = 38) in an eye-tracking task that measured the detection of audio-visual asynchrony. Webcam-based and in-lab eye-tracking data were compared on eye-tracking and video data quality, infants’ viewing behavior, and experimental effects. Results revealed no differences between the in-lab and online setting in the frequency of technical issues and participant attrition rates. Video data quality was comparable between settings in terms of completeness and brightness, despite lower frame rate and resolution online. Eye-tracking data quality was higher in the laboratory than online, except in case of relative sample loss. Gaze data quantity recorded by eye-tracking was significantly lower than by video in both settings. In valid trials, eye-tracking and video data captured infants’ viewing behavior uniformly, irrespective of setting. Despite the common challenges of infant eye-tracking across experimental settings, our results point toward the necessity to further improve the precision of online eye-tracking with infants. Taken together, online eye-tracking is a promising tool to assess infants’ gaze behavior but requires careful data quality control. The demographic composition of both samples differed from the generic population on caregiver education: our samples comprised caregivers with higher-than-average education levels, challenging the notion that online studies will per se reach more diverse populations.

Insights into Safety and Connection in Relationships Provided by Psychoanalytic Treatment of Autistic Individuals

ABSTRACT The creation of safety in a relationship is a prerequisite for the risk-taking required for developmental progress and therapeutic change. Psychoanalysts typically speak of safety in the analytic relationship in terms of verbal exploration of sources of the patient’s anxiety, and the analyst’s role in maintaining the frame. Yet it is clear that safety is not the same as the absence of threat, but is instead based on psychological safety as well as physical safety. Psychological safety – or safety with another person – requires the developmental capacity making social connections. The fields of infant research and neurodevelopment – particularly the work of Beatrice Beebe and Stephen Porges – have contributed significantly to this critical aspect of analytic work through their explications of stress regulation. Disorders of self-regulation – i.e. impairments in the capacity to manage stress and experience safety – are central to the neurodevelopmental disorder of autism. In addition, language and symbolization are typically compromised in individuals on the autism spectrum. Therefore, therapists working with individuals on the autistic spectrum must explore alternatives to language and symbols for creating a safe environment. These alternative methods of communication are what I call the “music and dance” of therapeutic action. In this article I will first discuss some relevant contributions from research in infancy and neurodevelopment. I will then use a clinical illustration of analytic work with a child on the autistic spectrum to demonstrate nonverbal and largely implicit bodily means of mutual regulation with a patient. This example not only applies to the treatment of autism, but also provides more general insights into methods of creating safety in the analytic dyad.

Improving the generalizability of infant psychological research: The ManyBabies model.

Yarkoni's analysis clearly articulates a number of concerns limiting the generalizability and explanatory power of psychological findings, many of which are compounded in infancy research. ManyBabies addresses these concerns via a radically collaborative, large-scale and open approach to research that is grounded in theory-building, committed to diversification, and focused on understanding sources of variation.

Multiple Interactions in the Philosophy of Daniel Dennett, Empirical Sciences and Contemporary Culture

This paper will discuss the importance of the work of the contemporary analytic philosopher Daniel Dennett in the empirical sciences from a historical perspective and its impact on psychology in particular. The paper will also delve into his affinities with contemporary cultural changes. Dennett as a philosopher takes natural sciences seriously and, in addition, inspires empirical research himself. Dennett’s most important contributions to the cognitive sciences came from his renewal of the idea of intentionality in the human mind. This proposal has played a central role in the research on primates which was conducted in part to understand the evolutionary origins of our Theory of Mind (ToM). The intentional stance idea was a further, crucial step in the formation of contemporary infancy research studying the emergence of goal-based action interpretation schemata in human babies. Finally, Dennett’s proposal about the hierarchy of physical, design and intentional stances, as well as his selection tower metaphor can be used as tools for organizing the conceptual structure of the history of psychology. This paper specifically shows this relevance regarding the debates about animal teleology, and the relations between behaviorism and cognitivism.

Understanding the causes and consequences of variability in infant ERP editing practices.

The current study examined the effects of variability on infant event-related potential (ERP) data editing methods. A widespread approach for analyzing infant ERPs is through a trial-by-trial editing process. Researchers identify electroencephalogram (EEG) channels containing artifacts and reject trials that are judged to contain excessive noise. This process can be performed manually by experienced researchers, partially automated by specialized software, or completely automated using an artifact-detection algorithm. Here, we compared the editing process from four different editors-three human experts and an automated algorithm-on the final ERP from an existing infant EEG dataset. Findings reveal that agreement between editors was low, for both the numbers of included trials and of interpolated channels. Critically, variability resulted in differences in the final ERP morphology and in the statistical results of the target ERP that each editor obtained. We also analyzed sources of disagreement by estimating the EEG characteristics that each human editor considered for accepting an ERP trial. In sum, our study reveals significant variability in ERP data editing pipelines, which has important consequences for the final ERP results. These findings represent an important step toward developing best practices for ERP editing methods in infancy research.

A Framework for Online Experimenter-Moderated Looking-Time Studies Assessing Infants' Linguistic Knowledge.

Online data collection methods pose unique challenges and opportunities for infant researchers. Looking-time measures require relative timing precision to link eye-gaze behavior to stimulus presentation, particularly for tasks that require visual stimuli to be temporally linked to auditory stimuli, which may be disrupted when studies are delivered online. Concurrently, by widening potential geographic recruitment areas, online data collection may also provide an opportunity to diversify participant samples that are not possible given in-lab data collection. To date, there is limited information about these potential challenges and opportunities. In Study 1, twenty-one 23- to 26-month-olds participated in an experimenter-moderated looking-time paradigm that was administered via the video conferencing platform Zoom, attempting to recreate in-lab data collection using a looking-while-listening paradigm. Data collected virtually approximated results from in-lab samples of familiar word recognition, after minimal corrections to account for timing variability. We also found that the procedures were robust to a wide range of internet speeds, increasing the range of potential participants. However, despite the use of an online task, the participants in Study 1 were demographically unrepresentative, as typically observed with in-person studies in our geographic area. The potentially wider reach of online data collection methods presents an opportunity to recruit larger, more representative samples than those traditionally found in lab-based infant research, which is crucial for conducting generalizable human-subjects research. In Study 2, microtargeted Facebook advertisements for online studies were directed at two geographic locations that are comparable in population size but vary widely in demographic and socioeconomic factors. We successfully elicited sign-up responses from caregivers in neighborhoods that are far more diverse than the local University community in which we conduct our in-person studies. The current studies provide a framework for infancy researchers to conduct remote eye-gaze studies by identifying best practices for recruitment, design, and analysis. Moderated online data collection can provide considerable benefits to the diversification of infant research, with minimal impact on the timing precision and usability of the resultant data.