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The Role Of Gamma Oscillations And Cortical Inhibition In The Development Of Working Memory In Adolescence, Christopher P. Walker

Dissertations & Theses (Open Access)

Adolescence is a dynamic period of social, cognitive, and biological changes. In particular, working memory, the ability to actively encode and maintain information over a short period of time, develops early in childhood and gradually increases in capacity and stability during adolescence. The precise neurophysiological mechanism by which working memory capacity increases during adolescence is unclear. The objective of this investigation was to evaluate the role of cortical gamma-band (> 30 Hz) oscillations—which are associated with working memory in adults—for the development of working memory capacity in adolescents, and to identify the extent to which the temporal profile of gamma-aminobutyric …

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 …

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, …

Digital Childhood: How Mobile Devices Impact Child Development And Adolescent Behavior, Brenna Pinnock

Global Honors Theses

A new wave of smart and modern technology has integrated into lives and homes of families everywhere, thus the effects of early and continual exposure to this technology remain unknown. This is a global problem as many people around the world have access to this technology and interact with it in different ways. Whether it’s embracing it for future generations like Japan, or helping the newer generations with their overuse, almost addiction like tendencies with these devices like in South Korea. Around the world children are engaging with these devices at a young age and it’s found to have an …

The Influence Of Team Cohesion And Contextual Performance On Project Team Performance Over Time, Melissa Vazquez

College of Science and Health Theses and Dissertations

Theory and empirical research suggest that team cohesion and contextual performance relate to team performance. However, while general support exists for a team cohesion and contextual performance relationship, less is known about the how the relationship evolves over time. This study aimed to examine the extent to which team cohesion and contextual performance reciprocally relate over time. Data were collected from 245 individuals comprising 40 student project teams engaged in the Capsim business simulation over a 10-week quarter. Results supported hypothesis 1; based on a cross-lagged path model, a stronger relationship exists between contextual performance at time point 1 and …

“Get Tough!”: A Case Study On The Development Of The Sport Ethic In Youth Lacrosse, Ross Budziszewski

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

While participation in youth sport is often linked with positive psychosocial and physical outcomes (Holt et al., 2017), this context can also cultivate ideals that lead to the development of unethical beliefs as well as unsafe sport practices (Al-Yaarbi & Kavussanu, 2017). The sport ethic is described as the deviant overconformity by an athlete to fit societal expectations of a sport’s high-performance culture (Hughes & Coakley, 1991). Strong beliefs in the sport ethic can lead to moral disengagement, antisocial behavior, and viewing sport like warfare (Shields, Funk, & Bredemeier, 2015). Although the sport ethic has been examined in competitive adult …

A Sequential Explanatory Mixed Methods Exploration Of Practitioner Use, Development, And Satisfaction Of Theoretical Paradigms In Sport Psychology, Christopher E. Bilder

Dissertations, 2014-2019

The purpose of this sequential explanatory mixed methods study was to identify the use, development, and perceived satisfaction of current theoretical paradigms by sport psychology practitioners. Participants for the quantitative portion of the study were 170 (95 women, 65 men) sport psychology practitioners.

Results of a frequency analysis revealed that most practitioners use an integrative paradigm type, and the most commonly used paradigms were CBT, ACT, and humanistic. A descriptive analysis revealed that theoretical paradigms are developed across all developmental levels. Independent between-groups ANOVAs indicated that primary training background significantly impacted the principles perceived to be necessary (i.e., sport science …

First Thirty Days Of Life: Examining Calf Behavioral Development In Beluga Whales (Delphinapterus Leucas) And Pacific White-Sided Dolphins (Lagenorhyncus Obliquidens) At One Zoological Facility, Kendal Smith

Master's Theses

Cetacean development is important for general comparative understanding and the implementation of informed husbandry policies. Due to the inaccessibility of many of these species in the wild, researchers can study managed care populations to better understand basic developmental patterns of cetaceans, as well as to improve husbandry policies for facility animals. However, no previous studies have attempted to observe the behavioral development of Pacific white-sided dolphins (Lagenorhyncus obliquidens). Eight beluga whale calves and four Pacific white-sided dolphin calves were observed for the first 30 days of life to determine the developmental trajectory of several typically monitored behaviors. The …

A Study Of Beluga (Delphinapterus Leucas) Vocal Ontogeny, Audra Elizabeth Ames

Dissertations

There is a shortage of literature regarding beluga (Delphinapterus leucas) vocal ontogeny, as presently, there has only been one published study on the vocal development of beluga calves, despite the value of ontogenetic studies for our understanding of sound-centered species. Here I offer the second longitudinal study of beluga vocal development. Using a calibrated digital hydrophone with a sampling rate of 256 kHz, I studied the vocal progression of a male beluga calf in early life. From his first day, the calf produced broadband pulse trains with upper frequency limits extending past the study’s Nyquist frequency (128 kHz); …

Selection Or Socialization? A Propensity Score Matched Study Of Personality And Life Events, Emorie Beck

Arts & Sciences Electronic Theses and Dissertations

Across the lifespan, personality changes in normative ways, but the source of such change remains ambiguous. Life events may be one impetus of such change, but strong selection effects into such events makes it unclear whether such change is driven by already existing differences (selection) between people or socialization following life events. In a preregistered study, we test socialization and selection effects of the Big 5 and life events using a large (N = 19,627) representative sample of Germans and 12 life events (e.g. marriage, retirement) from the GSOEP. Using propensity score matching and Bayesian multilevel growth curve models, we …

Assessing Readiness For A Physical Activity Intervention In Positive Youth Development Afterschool Programs, Brittany Skiles Cook

Theses and Dissertations

Physical inactivity has been identified as a primary health threat to youth, and existing afterschool programs (ASP) are a promising context for implementing physical activity (PA) interventions. However, few PA interventions have been effective and generalizability of programs has been poor. Assessing organizational readiness during the testing of a PA intervention can help inform generalizability and sustainability. The R=MC2 heuristic separates readiness into motivation, innovation-specific capacity, and general capacity, each of which are further divided into subcomponents. The current multiple-case study pilot tests the feasibility and effectiveness/efficacy of a readiness assessment tool based on R=MC2 developed for the Connect through …

Characterizing The Development Of Episodic Memory And Assessing The Reliability Of Fmri Measures, Lingfei Tang

Wayne State University Dissertations

The ability to remember past events is critical for everyday life and showed robust improvement over development from childhood to adulthood. With advances in noninvasive neuroimaging methods such as functional MRI in recent years, research efforts have been focused on identifying neural correlates underpinning developmental gains in memory performance. In my dissertation work, using a widely-validated subsequent memory paradigm, I aim to characterize functional MRI correlates of memory development. Specifically, I focused my investigation on identifying age differences in the functional patterns of two brain regions critical for memory, the prefrontal cortex and the hippocampus. Focusing on the prefrontal cortex …

Predicting Outcomes Of American Youths' Shift Toward E-Cigarette Use, D J. Resendez

Walden Dissertations and Doctoral Studies

There has been a shift toward e-cigarette use and away from tobacco smoking among American youth. Despite effects of ongoing public health campaigns that bring attention to the harmful effects of tobacco and nicotine use generally, youths might not perceive e-cigarette use to be unhealthful in terms of psychological functioning. This study was an investigation of the impact of the method of tobacco use (cigarette or e-cigarette), past cessation attempts, cravings or needs to use tobacco, and serious cognitive difficulties, upon youths' intentions concerning future tobacco usage. The conceptual framework was based upon the self-medication hypothesis, biopsychosocial model, and social …

The Role Of Progesterone Receptor In The Developing Medial Preoptic Nucleus, Diana Lalitsasivimol

Legacy Theses & Dissertations (2009 - 2024)

Numerous neurodevelopmental and neuropsychiatric diseases have a distinct sex bias in