Forming predictions about what is going to happen next is a crucial ability that develops early in life. Theory and some empirical evidence suggest that predictive abilities may be impaired in Autism Spectrum Disorder (ASD). The overarching aim of this thesis is to investigate early measures of prediction in relation to concurrent and later outcomes in typical and atypical development, with a particular focus on ASD and related behavioral problems.

In Study I, we used motion capture technology to examine prospective motor control and its relationship to executive functions in typically developing 18-month-olds. Our findings showed that motor control is associated with executive functioning in infancy.

Study II investigated motor control in infants at low and elevated likelihood for ASD and examined how these measures relate to later development. We found group differences as well as similarities in motor control in 10-months-olds with and without a familial history of ASD. Early motor measures were related to general developmental level, but not ASD symptomatology in toddlerhood.

Using eye tracking, Study III examined how infants with later ASD and neurotypical infants form predictions about visual object motion. Our findings indicated that infants with later ASD were able to form predictions about object motion and adapt to simple changes in motion patterns, and that their performance did not differ from the performance of neurotypical infants.

In Study IV, we surveyed parents about their experiences during participation in an infant sibling study of ASD as a first step to understanding the benefits and risks associated with this type of research. Parents were generally positive about their experiences both from their own perspective as well as, the child’s perspective.

This thesis illustrates the potential of using advanced technology, such as motion tracking and eye tracking, to study and compare prediction in typical and atypical development. It points to the important role of prediction and motor control for child development, but fails to find a specific link to ASD.

Background:

Prospective longitudinal studies of infant siblings of children with autism spectrum disorder (ASD) play an important role in advancing our knowledge about early developmental pathways in ASD. Despite this clear benefit, currently little is known about potential risks or disadvantages for participating families. As a first step in addressing this issue, we asked parents about their experiences from participating in an infant sibling study.

Method:

Eighty-eight families responded to a questionnaire examining parents' experiences from participating in an infant sibling study. The questions assessed parents' satisfaction with the study, the child's perceived satisfaction, and the parents' motivation for participating. The study included parents of two groups, (1) infants with an older sibling diagnosed with ASD (HR, high risk, n = 43) and (2) infants with no familial history of ASD (LR, low risk, n = 21).

Results:

The results indicated that parents are generally positive about study participation and few disadvantages were reported. This pattern was mirrored when splitting parents' responses into the two groups. There was no indication for group differences between parents of infants at high risk and low risk for ASD.

Conclusion:

Our findings present a first step into understanding parents' experiences from participating in an infant sibling study. Most parents were satisfied with participation in the study and only few disadvantages were reported. Our results have implications for ethical discussions about benefits and risks regarding infant sibling studies in various fields.

In typical development, infants form predictions about future events based on incoming sensory information, which is essential for perception and goal-directed action. It has been suggested that individuals with autism spectrum disorder (ASD) make predictions differently compared to neurotypical individuals. We investigated how infants who later received an ASD diagnosis and neurotypical infants react to temporarily occluded moving objects that violate initial expectations about object motion. Our results indicate that infants regardless of clinical outcome react similarly to unexpected object motion patterns, both in terms of gaze shift latencies and pupillary responses. These findings indicate that the ability to update representations about such regularities in light of new information may not differ between typically developing infants and those with later ASD.

Atypical motor development has frequently been reported in infants at elevated likelihood for autism spectrum disorder. However, no previous study has used detailed motion capture technology to compare infant siblings of children with autism spectrum disorder and infant siblings with no familial history of autism spectrum disorder. We investigated reaching movements during an interceptive action task in 10-month-old infants using kinematic data with high spatiotemporal resolution. The results indicated that several measures were different in infants at elevated likelihood. However, longitudinal analyses revealed that while specific infant motor measures (e.g. number of movement units) were related to broad measures of general developmental level in toddlerhood, the associations with later autism spectrum disorder symptomatology were not significant. These findings confirm that some aspects of motor functioning are atypical in infants at elevated likelihood for autism spectrum disorder, but provide no support for the view that these issues are specifically linked to autism spectrum disorder symptoms, but may rather reflect neurodevelopment more generally.Lay abstractAtypicalities in motor functioning are often observed in later born infant siblings of children with autism spectrum disorder. The goal of our study was to investigate motor functioning in infants with and without familial history of autism spectrum disorder. Specifically, we investigated how infants catch a ball that is rolling toward them following a non-straight path, a task that requires both efficient planning and execution. Their performance was measured using detailed three-dimensional motion capture technology. We found that several early motor functioning measures were different in infants with an older autistic sibling compared to controls. However, these early motor measures were not related to autistic symptoms at the age of 2 years. Instead, we found that some of the early motor measures were related to their subsequent non-social, general development. The findings of our study help us understand motor functioning early in life and how motor functioning is related to other aspects of development.

The importance of executive functioning for later life outcomes, along with its potential to be positively affected by intervention programs, motivates the need to find early markers of executive functioning. In this study, 18-month-olds performed three executive-function tasksinvolving simple inhibition, working memory, and more complex inhibitionand a motion-capture task assessing prospective motor control during reaching. We demonstrated that prospective motor control, as measured by the peak velocity of the first movement unit, is related to infants' performance on simple-inhibition and working memory tasks. The current study provides evidence that motor control and executive functioning are intertwined early in life, which suggests an embodied perspective on executive-functioning development. We argue that executive functions and prospective motor control develop from a common source and a single motive: to control action. This is the first demonstration that low-level movement planning is related to higher-order executive control early in life.

Autism is frequently associated with difficulties with top-down attentional control, which impact on individuals’ mental health and quality of life. The developmental processes involved in these attentional difficulties are not well understood. Using a data-driven approach, 2 samples (N = 294 and 412) of infants at elevated and typical likelihood of autism were grouped according to profiles of parent report of attention at 10, 15 and 25 months. In contrast to the normative profile of increases in attentional control scores between infancy and toddlerhood, a minority (7–9%) showed plateauing attentional control scores between 10 and 25 months. Consistent with pre-registered hypotheses, plateaued growth of attentional control was associated with elevated autism and ADHD traits, and lower adaptive functioning at age 3 years.