Social and Behavioral Sciences Commons^™

Quantifying Neuromelanin Content Across Varying Magnetic Field Strengths: A Comparative Analysis, Laiba Rizwan

Electronic Thesis and Dissertation Repository

Neuromelanin (NM) is an insoluble dark pigment molecule that is found in the substantia nigra of the human brain. Due to its paramagnetic nature, NM can be imaged using MRI in the form of neuromelanin sensitive contrast. This method, known as Neuromelanin Sensitive Magnetic Resonance Imaging (NM-MRI) allows non-invasive imaging of the human substantia nigra through its by-product, NM. NM-MRI research has been mostly done using lower field strength (3 or 1.5 Tesla) MRI scans. The advent of high field strength imaging, e.g., 7 Tesla (7T) provides the opportunity to study neuromelanin production sites with higher spatial resolution and enhanced …

A Transdiagnostic Examination Of Cognitive Heterogeneity In Children And Adolescents With Neurodevelopmental Disorders, Sarah Al-Saoud, Emily S. Nichols, Emma G. Duerden, Loretta Norton

Western Libraries Undergraduate Research Awards (WLURAs)

Children and adolescents with neurodevelopmental disorders (NDDs) demonstrate extensive cognitive heterogeneity that is not adequately captured by traditional diagnostic systems. Using a transdiagnostic approach, a retrospective cohort study of cognitive functioning was conducted with a large heterogenous sample (n = 1529) of children and adolescents 7 to 18 years of age with NDDs. Measures of short-term memory, verbal ability, and reasoning were administered to participants with attention-deficit/hyperactivity disorder (ADHD), autism spectrum disorder (ASD), comorbid ADHD/ASD, and typically developing (TD) participants using a 12-item web-based neurocognitive testing battery. Unsupervised machine learning techniques were implemented to create a self-organizing map (SOM), …

A Multi-Method Assessment Of The Impact Of Stress On Families’ Mental Health During The Covid-19 Pandemic, Andrew R. Daoust

Electronic Thesis and Dissertation Repository

The COVID-19 pandemic was a pervasive disaster, creating stress for people across the globe. As such, understanding how pandemic-related stress has impacted individuals’ mental health is vital for guiding intervention programs and limiting the impact of future similar crises. This is especially true for youth, who are at heightened risk for mental disorder and may experience pandemic-related social stress as particularly aversive, given the developmental challenges unique to this period. Although substantial efforts have been made to measure the impact of the pandemic-related stress on individuals’ mental health, the pandemic’s relatively sudden onset has limited researchers’ abilities to conduct fulsome …

White Matter Connectome Associations With Reading Functions In Children, Chenglin Lou

Electronic Thesis and Dissertation Repository

This thesis investigated associations between the white matter connectome and reading in children with a wide range of reading abilities. It is well established that the connectome supports the interplay among brain regions and connections within an integrated system. In this dissertation, I examine the hypothesis that it could therefore represent multiple mapping processes among reading components and further explain variations in reading performance. Such associations between the organization of the connectome and reading skills have not been well explored. This thesis aimed to address this issue by considering both the relationship between connectome measures and standardized reading performance out …

Examining The Relationships Between Socio-Cognitive Factors And Neural Synchrony During Movie Watching Across Development, Kathleen M. Lyons

Electronic Thesis and Dissertation Repository

While different cognitive abilities mature, the conscious experiences of children likely become richer and more elaborate. A challenge in investigating relationships between cognitive development and real-world experiences is having measures that assess naturalistic processing. Movie watching offers a solution, since following the plot of a film requires cognitive processes that are similar to real-world experiences. When different adults watch the same film, their brain activity begins to align (known as neural synchrony). The strength of this alignment has been shown to reflect the degree to which different individuals are having a similar experience of the movie. While this phenomenon has …

Changes In Audiovisual Integration In Aging, Alyssa S. Lynn

Undergraduate Student Research Internships Conference

The proposed study will examine changes in audiovisual integration between younger and older adults. Audiovisual integration enables us to associate and bind related auditory and visual information and experience it as a single percept (Spence, 2007). Being able to properly integrate is crucial in our everyday lives. When perceiving speech, audiovisual integration binds visual information from lip movements with auditory information from the speaker's utterances so that speech can be perceived multimodally. With age, our auditory and visual sensory acuity tends to decline with audiovisual integration being impacted as a result (Brooks et al., 2018; Mahoney et al., 2011). We …

Parent-Youth Similarities On Negative Affect: Analyses Of Language Parameters In Semi-Structured Interviews, Leo Ye

Undergraduate Student Research Internships Conference

Abstract

Emotion is a crucial component of verbal communication that conveys messages besides the semantic meanings in speech. The phonological and locutionary cues reflect various emotional effects that are detectable for interpretation. Past research suggests that people who are physically and psychologically close to each other tend to express similar emotions through speech. This relationship has been scrutinized under empirical research for parent-infant relations. However, it is unclear whether the effect exists between parents and youths. This study analyzes recorded speeches of n = 8 parent-youth pairs from semi-structured Zoom interviews and compares them based on their similarities in negative …

Developmental Differences In The Learning And Consolidation Of Linguistic Regularities, Sarah Berger

Electronic Thesis and Dissertation Repository

Relative to adults, children have a well-known advantage for learning linguistic regularities, which could be partially driven by their deeper sleep. To examine the relationship between consolidation and language learning across development, children and adults learned a novel article system with an implicit grammatical rule. Participants performed a judgment task on phrases containing the novel articles before and after a night of EEG-monitored sleep. We found that rule sensitivity emerged rapidly in children, whereas it did not emerge until the second session in adults. Children demonstrated better generalization of the rule than adults. Consolidation effects showed a developmental double dissociation, …

Opening A Crack To Let The Light In: An Exploration Of An Online Group Adolescent Compassion Focussed Therapy Intervention, Euan Pb Fraser Tait

Electronic Thesis and Dissertation Repository

The current study’s goal is to expand the adolescent compassion focused therapy (CFT) literature by exploring participant experiences of a novel CFT protocol which was delivered in an online group therapy format. This study is a mixed methods approach using surveys, open-ended questionnaires, and interviews to explore participants’ experience and expression of feelings of inadequacy (FOI) and self-compassion. Thematic analysis findings revealed that participants struggled primarily with FOI relating to evaluative contexts such as school and sports and that these FOI also carried with them implications of self-worth and perfectionism. Through participating in the program, participants were able to de-shame …

Co-Rumination In Social Networks, Samantha M. Jones

Electronic Thesis and Dissertation Repository

Although co-rumination is associated with positive relationship perceptions, individuals that engage in this behaviour often report fewer friends and peer difficulties. Those with a tendency to co-ruminate also report elevated levels of internalizing symptoms. Thus, the tendency to co-ruminate may put individuals at risk of depressive and anxious symptoms as well as social problems as they make the challenging transition to university and build new social networks. I analyzed social network data from 458 first year undergraduate students during their first university semester. Co-rumination within a particular relationship was associated with greater tie strength and socio-emotional multiplexity. Co-rumination was positively …

Early Gaze Behaviours In Infants At High Familial Risk For Autism Spectrum Disorder: Association With Brain Development, Julia Teixeira Pinto Montenegro

Electronic Thesis and Dissertation Repository

Children diagnosed with Autism Spectrum Disorder (ASD) show impairments in gaze-following and will seldom engage in joint attention (JA). The ability to initiate JA (IJA) can be more impaired than the ability to respond to JA (RJA). In a longitudinal study, 101 high-risk infants for ASD (62% males) completed MRI scans at 4 or 6 months of age. Subcortical volumes (thalamus, basal ganglia, hippocampus, amygdala) were extracted. Gaze and JA behaviours were assessed with standardized measures. The majority of infants were IJA non-responders (n=93, 92%), and over half were RJA non-responders (n=50, 52%). In the non-responder groups, models testing the …

Screen Time Use And Children’S Mental Health During The Covid-19 Pandemic, Amira Hmidan

Electronic Thesis and Dissertation Repository

Parents with school-aged children have experienced numerous hardships during the 2020-2021 academic school year, including school closures, lockdowns, and travel restrictions. Higher levels of parent stress and screen time may adversely impact children’s behavioural outcomes. This longitudinal survey study examined the associations of parent stress, parenting styles, and prolonged screentime on internalizing and externalizing behaviours in school-aged children. Parents (n = 108) completed survey measures at two time points over the 2020-2021 academic school year. Two generalized estimating equations were performed. There was a significant positive interaction between parent stress and screen time (B = < .001; p = .001) …

Validating An Observational Coding System For The Dominance Behavioural System (Dbs) In Childhood, Jennifer Mullen

Electronic Thesis and Dissertation Repository

The dominance behavioural system (DBS) is a biologically based system that underpins individual differences in motivation for dominance and power. However, little is known about the DBS in childhood. In a pilot study aimed at developing a behavioural coding system for dominance, a key facet of the DBS, we collected and coded observational data from 58 children, assessed at ages 3 and 5-6. Between these ages, dominance was moderately stable, to a degree comparable to other early child temperament traits. Consistent with study hypotheses, boys were more dominant than girls, and dominance was negatively associated with children’s behavioural inhibition, effortful …

Characterizing A Novel Mobile Game Battery Assessment: A Comparison Of Performance-Based And Survey-Based Executive Functioning Instruments, Josephine A. Pham

Electronic Thesis and Dissertation Repository

Exploratory characterization of a novel mobile game battery was conducted via a correlational comparison with a standardized assessment of executive functioning. Previous literature has shown that computer-based and survey-based instruments have either very weak correlation or no correlation at all – giving the impression that these instruments may not measure the same constructs of executive functioning. Findings from the current exploratory study demonstrated significant associations but weak correlational strength between tasks from the computer-based game battery and an updated standardized survey-based instrument. This confirmed a trend found in previous literature, demonstrating little overlap between both instruments in executive functioning measurement. …

Who Are We Missing? The Impact Of Requiring Parental Or Guardian Consent On Research With Lesbian, Gay, Bisexual, Trans, Two-Spirit, Queer/Questioning Youth., Eli Cwinn, Courtney Cadieux, Claire V Crooks

Education Publications

PURPOSE: The purpose was to examine whether a requirement for parental or guardian consent systematically limits which lesbian, gay, bisexual, trans, two-spirit, queer/questioning (LGBT2Q+) youth participate in research.

METHODS: A total of 60 LGBT2Q+ youth (aged 14-18 years) completed measures assessing gender and sexual minority identity, depression and anxiety, help-seeking intentions, and social support.

RESULTS: A substantial proportion (37.6%) of youth reported that they would not have participated in the research if parental or guardian consent was required. Those who would not have participated had more negative attitudes about their sexual and gender identity, less family support, lower levels of …

Direct And Indirect Non-Suicidal Self-Injury (Nssi) Expression: An Investigation Into The Nature Of Nssi And Childhood Maltreatment, Emma Truffyn

Electronic Thesis and Dissertation Repository

Non-Suicidal Self-Injury (NSSI) involves deliberate damage to the body without suicidal intent. St. Germain and Hooley (2012) classify two forms of NSSI: direct and indirect. Direct NSSI is expressed through behaviours with immediate results (e.g. cutting), whereas indirect NSSI is expressed through means that are damaging to the body without immediate injury (e.g. promiscuity, substance abuse, risk behaviours, etc.). Research supports that NSSI behaviours occur in youth with histories of childhood maltreatment (CM; Trocmé et al., 2010); however, no study has examined if experiences of CM influence NSSI expression. Utilizing the InterRAI Child and Youth Mental Health tool (N …

Comparing Executive Functions In Dancers Versus Aerobic Exercisers: A Study On Older Adults, Jai S. Ravipati

Undergraduate Honors Theses

Many older adults may experience cognitive decline with aging, and with a rising aging population it is important to investigate interventions that improve cognitive functions. The purpose of this study was to assess differences in executive functioning between older adult dancers and older adult aerobic exercisers. Given that dance involves the use of executive functions, in addition to engaging in aerobic exercise, older adult dancers were expected to score higher on the executive functioning tasks than the older adult aerobic exercisers. Using the Cambridge Brain Sciences Battery to assess executive functioning, this study sought to compare older adults, 50 years …

Construction And Preliminary Validation Of The Interrai 0-3 Developmental Domains, Jo Ann M. Iantosca

Electronic Thesis and Dissertation Repository

Background. With no standardized approach for early assessment of childhood development in Canada, and with a lack of a comprehensive assessment-to-intervention system that amalgamates social, psychiatric, medical, functional, psychological, and environmental constructs, the interRAI 0-3 was developed to support intervention efforts based on the needs of young children and their families. The interRAI 0-3 includes over 650 items that seek clinical information, developmental milestones, and context items regarding the family and social relationships surrounding the child. The newly developed interRAI 0-3 was most recently evaluated to examine the reliability and validity of the Expressive and Receptive Language and the Gross …

The Relationship Between Theory Of Mind And Executive Function: Are They Two Facets Of The Same Process Or Two Distinct Processes?, Isu Cho

Electronic Thesis and Dissertation Repository

This dissertation examines the relationship between Theory of Mind (ToM) and Executive Function (EF). There has been debate on whether ToM and EF are two facets of the same process or are two distinct processes. Distinguishing between these possibilities empirically is challenging because the two abilities have similar developmental timetables and ToM tasks typically place high demands on EF, with the consequence that ToM and EF performance measures may be artificially correlated. Three experiments explored the nature of this relationship. Experiments 1 and 2 tested whether socio-cultural factors known to influence individual differences in EF (i.e., bilingualism, country-of-origin) extend to …

Child And Adolescent Sleep Disturbances And Psychopathology In A Mental Health Clinic Sample, Aviva Blacher

Electronic Thesis and Dissertation Repository

Sleep disturbances in children and adolescents (hereafter children) are associated with significant short-term and long-term impairments including more severe psychopathology, reduced cognitive functioning, and poorer general health. We know that children being treated in specialty mental health services are more likely to have sleep disturbances than community samples. We also know that relationships exist between sleep and psychopathology in children with specific disorders (e.g. ADHD, depression, etc.). However, few studies have investigated the relationship between sleep and psychopathology in a broad sample of children seen at mental health agencies. Both child factors and family factors may influence both sleep and …

In Search Of Psychiatric Kinds: Natural Kinds And Natural Classification In Psychiatry, Nicholas Slothouber

Electronic Thesis and Dissertation Repository

In recent years both philosophers and scientists have asked whether or not our current kinds of mental disorder—e.g., schizophrenia, depression, bipolar disorder—are natural kinds; and, moreover, whether or not the search for natural kinds of mental disorder is a realistic desideratum for psychiatry. In this dissertation I clarify the sense in which a kind can be said to be “natural” or “real” and argue that, despite a few notable exceptions, kinds of mental disorder cannot be considered natural kinds. Furthermore, I contend that psychopathological phenomena do not cluster together into kinds in the way that paradigmatic natural kinds (e.g., chemical …

How Do Humans Process Magnitudes? An Examination Of The Neural And Cognitive Underpinnings Of Symbols, Quantities, And Size In Adults And Children, Helen Moriah Sokolowski

Electronic Thesis and Dissertation Repository

A striking way that humans differ from other species is our unique ability to represent and manipulate symbols. This ability to process numerical magnitudes symbolically (e.g., ‘three’, ‘3’) is widely thought to be supported by an ancient system that evolved to process nonsymbolic numerical magnitudes (i.e., quantities). In this thesis, I present four empirical studies to uncover whether symbolic representations are indeed supported by the system that evolved to process quantities, or if symbolic representations are sub-served by a similar but ultimately distinct system.

In experiments 1 and 2, I investigate how the adult brain processes symbols and quantities using …

How Does The Brain Represent Digits? Investigating The Neural Correlates Of Symbolic Number Representation Using Fmri-Adaptation, Celia Goffin

Electronic Thesis and Dissertation Repository

How does the brain represent numerical symbols (e.g., Arabic digits)? Activity in left parietal regions correlates with symbolic number processing. Research with functional resonance imaging adaptation (fMRI-A) indicates that the intraparietal sulcus (IPS) exhibits a rebound (increase in activation) effect when a repeatedly presented number is followed by a new number. Importantly, this rebound effect is modulated by numerical ratio as well as the difference between presented numbers (distance). This ratio-dependent rebound effect could reflect a link between symbolic numerical representation and an approximate number system (ANS). In this doctoral dissertation, fMRI-A is used to investigate mechanisms underlying symbolic number …

Cognitive, Neural, And Educational Contributions To Mathematics Performance: A Closer Look At The Roles Of Numerical And Spatial Skills, Zachary C.K. Hawes

Electronic Thesis and Dissertation Repository

The principal aims of this thesis were to (1) provide new insights into the cognitive and neural associations between spatial and mathematical abilities, and (2) translate and apply findings from the field of numerical cognition to the teaching and learning of early mathematics.

Study 1 investigated the structure and interrelations amongst cognitive constructs related to numerical, spatial, and executive function (EF) skills and mathematics achievement in 4- to 11-year old children (N=316). Results revealed evidence of highly related, yet separable, cognitive constructs. Together, numerical, spatial, and EF skills explained 84% of the variance in mathematics achievement (controlling for chronological age). …

Pilot And Adaptation Of A Social-Emotional Learning Program In Youth Justice Settings, Amanda J. Kerry

Electronic Thesis and Dissertation Repository

Interventions for youth offenders should aim to reduce risk factors and promote protective factors. Social-emotional learning (SEL) programs aim to enhance intrapersonal, interpersonal, and cognitive competencies. Research demonstrates that SEL programs reduce antisocial behaviours and improve prosocial skills; however, to date, SEL programs have been primarily implemented in schools. This integrated-article dissertation explored the feasibility and preliminary outcomes of implementing a SEL program in youth justice settings. The first paper proposes the implementation of SEL programs in youth justice settings and identifies unique programming and implementation considerations for this population.

The second paper presents a two-phase study examining the feasibility, …

Police Prevention Of Domestic Homicide: Missed Opportunities And Barriers To Change, Michael D. Saxton

Electronic Thesis and Dissertation Repository

This integrated-article dissertation focused on the critical role of police in responding to domestic violence (DV) and recognizing the potential risk of adult and child homicides. The first study examined the police role in domestic homicide through an analysis of cases reviewed by the Domestic Violence Death Review Committee in Ontario, Canada. Homicide cases with police contact were found to have 1.6 times more risk factors compared to those without police contact. Cases also show an overall scarcity of formal risk assessments, even when there was prior police contact. The second study was a national survey on the types of …

The Origins And Development Of Visual Categorization, Laura Cabral

Electronic Thesis and Dissertation Repository

Forming categories is a core part of human cognition, allowing us to make quickly make inferences about our environment. This thesis investigated some of the major theoretical interpretations surrounding the neural basis of visual category development. In adults, there are category-selective regions (e.g. in ventral temporal cortex) and networks (which include regions outside traditional visual regions—e.g. the amygdala) that support visual categorization. While there has been extensive behavioural work investigating visual categorization in infants, the neural sequence of development remains poorly understood. Based on behavioral experiments, one view holds that infants are initially using subcortical structures to recognize faces. Indeed, …

Development And Validation Of A Battery Of Emotionally Evocative Film Clips For Use With Young Children, Lindsay Gabel

Electronic Thesis and Dissertation Repository

Investigating normative and maladaptive emotional development requires the ability to elicit children’s reactivity to a range of affective stimuli. However, the field lacks a validated battery of stimuli tapping a broad range of childhood emotions. We therefore sought to validate a developmentally appropriate battery of emotionally evocative film stimuli, covering a range of affective responses, for use with children. During pilot work, clips were verified as age-appropriate by parents of young children. Next, during a laboratory visit, 39 children (22 girls; M_age = 7.19 years, SD = .76) viewed 20 film clips thought likely to elicit either positive affect, …

Investigating The Effects Of Parent Dispositional Mindfulness, Parent-Child Conflict And Stress On Children's Self-Regulation, Cassandra Trevisani

Electronic Thesis and Dissertation Repository

A mixed-methods research design was employed to explore (a) how parent-child conflict, parent dispositional mindfulness and child sex were related to parental stress and children’s self-regulation and, (b) how parents at different levels of dispositional mindfulness describe their children’s strengths and challenges. Data were gathered from 106 Canadian parents (n = 97 mothers, Mean age = 36.24, SD = 3.95) who provided reports of their parent-child conflict, dispositional mindfulness, stress, their child’s self-regulation and children’s strengths and challenges at home (N = 106 children, boys = 50, Mean age = 5.95, SD = 0.48). Path analysis demonstrated that …

Exploring The Process Of Statistical Language Learning, Nicolette B. Noonan

Electronic Thesis and Dissertation Repository

In this thesis, I investigated the process of statistical word segmentation using a combination of behavioural, clinical, and neuroimaging approaches. Prior research has largely focused on the outcome of statistical learning approaches, with little research attention paid to the process of learning. In this body of research, I sought to address this issue. In Chapter 2, I examined how domain-specific and domain-general working memory interference effects on a statistical word segmentation task. I found that when completing a concurrent visuospatial or verbal working memory task, statistical language learning was impaired. Thus, this study provided some evidence that domain-general working memory …