This thesis focuses on the development of a cochlear implant (CI) that uses photons to stimulate surviving auditory neurons in severe-to-profoundly deaf individuals. The benefit of optical over electrical stimulation is its spatial selectivity with the potential to create significantly more independent channels to encode acoustic information and likely enhances...
Women living with human immunodeficiency virus (WLWH) have unique health challenges. Understanding psychological strengths that help WLWH manage their disease and improve health outcomes could reduce disease burden. Although spirituality, a multidimensional construct that includes a search for meaning and purpose, connection with a higher dimension, and experiences and feelings...
Introduction: Irritable bowel syndrome (IBS) is a disorder of gut-brain interaction associated with reduced quality of life, increased rates of depression and anxiety, and high economic burden to society and the individual. Current behavioral interventions, which target well-known symptom exacerbating factors such as catastrophizing and gastrointestinal- specific anxiety, have demonstrated...
Recent studies have begun to examine white matter connectivity aberrations in psychiatric populations, such as major depressive disorder. Several studies have found reduced white matter integrity (WMI) in depressed samples, though the location of this reduction is not clear. Incorporating symptom measures of depression severity and rumination may allow for...
The concealed information test (CIT) has garnered more empirical support than other methods of recognition detection and has a firm theoretical foundation. Because it occurs involuntarily, even when recognition is denied, P300 amplitude is a robust indictor of concealed information. Although the P300-based CIT shows great promise for field use,...
Sexual orientation is conventionally understood as relative attraction to men versus women. It has recently been argued that male sexual orientation in particular can be extended to include other dimensions of sexual attraction besides gender, such as sexual maturity and location. With respect to the dimension of location, most men...
Young children can sometimes acquire new vocabulary words—even property terms—through indirect learning (e.g. Carey & Bartlett, 1978). We explore two factors that contribute to this ability—perceptual alignment and linguistic contrast. We propose that spontaneous comparison processes lead children to notice key commonalities and differences that facilitate indirect property word learning....
Rhythmic fluctuations of electrical activity in the brain provide insights into the proposed mechanism by which we encode experiences and then maintain, forget, modify, and retrieve them. Yet there is still much to learn about how neural oscillations relate to memory function. The purpose of this research is to discover...
Selective attention enables people to focus on a small number of objects, features, or events with good resolution. Sometimes attention may also be less selective and distributed across numerous items, which allows more information to be processed at a lower resolution. The degree to which attention is more or less...
Dynamic decision-making is a complex process that relies on our ability to generate, evaluate and implement a variety of strategies. Understanding how people navigate this process is a difficult problem that requires a wide range of methodologies. This study details a combination of behavioral experiments, computational modeling, and neuroimaging that...
Interactions between working memory and long term memory systems are still not well understood, as the systems have long been thought to be mostly separate. An interesting intersection of these memory systems is domain-specific expertise, whereby individuals are able to show supra-span memory for information related to the area of...
This dissertation investigates the relationship between melancholy and the development of American and Iranian literary discourses as responses to the crisis of postwar sovereignty. While situating itself against the complicated backdrop of US/Iran relations since the Second World War, it explores the impact of religion on the formation of political...
Agency is a broad orientation aimed to advance the self and one’s own abilities, whereas communion is a broad orientation aimed to interact with others and connect to people in a larger social context. In Chapter 1, I introduce a new framework to conceptualize the constructs of agency and communion....
The groups that we identify with help to make us who we are. This dissertation investigates the impact of the way that each of us understands those identities, through the newly introduced construct of collective self-concept clarity (Gardner & Garr-Schultz, 2017). Two aspects of collective self-concept clarity are introduced and...
This dissertation investigates two ways in which personality psychology should move beyond the traditional approach of measuring personality with broad domains composed of trait descriptors, as exemplified by the Big Five taxonomy. The first study (Chapter 2) suggests an alternative to the traditional approach of aggregating personality items into domains....
Orienting attention enables us to select, process, and react to relevant objects in complex environments. Just as we can orient attention in space and to certain object features, recent research has shown that we can also orient attention in time (temporal orienting). This dissertation investigates the mechanisms and the effects...
Exposure to violence, which includes child abuse, neglect, witnessing domestic or community violence, crime, and sexual assault, is a national concern. Over the course of a year, 68% of children under age 17 are exposed to at least one form of violence (Finkelhor, Turner, Shattuck, & Hamby, 2015). Young children...
Interpersonal hierarchies are one of the most fundamental structures by which human interactions are organized (Yu & Kilduff, 2019), and dual-strategies theory suggests that humans navigate these hierarchies through the use of dominance (force and coercion) or prestige (display of valued traits to gain respect; Maner & Case, 2016). In...
Difficulties in prosody (e.g., intonation, volume, rate), turn-taking, and overly formal speech constitute common social communication deficits in autism spectrum disorder (ASD), which can significantly hinder social interactions (Paul et al., 2009). Subtle parallel differences in social communication have also been noted in parents of individuals with ASD, suggesting that...
People need to feel authentic at work, but authenticity is not always a priority in organizations. This dissertation shows feeling authentic is essential to feeling human. Chapter 1 provides an overview of research on authenticity and self-dehumanization, describing why feeling inauthentic leads to self-dehumanization. Chapter 1 empirically supports the association...