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...
Memory systems research has established the importance of two distinct types of memory systems in the brain: explicit and implicit. While a robust literature exists on individual differences in the explicit domain (Chapter 3), research on individual differences in implicit learning remains relatively limited. The key question guiding the investigation...
Students often change majors during college, and most workers change jobs throughout their careers. Yet the diverse opportunities for entering natural science, technology, engineering, and mathematics (STEM) fields are often overlooked during college and beyond. This dissertation therefore analyzed four large nationally representative datasets to characterize the pathways for joining...
There has long been an interest in the idea of generativity the concern for and commitment towards promoting the well-being of future generations. In Western societies, generativity can be characterized through societal contributions and acts dedicated towards others. Since the early 1960s, when Erikson proposed generativity as the major developmental...
Research shows that psychometrically-assessed spatial abilities (e.g., spatial visualization and spatial orientation) can be improved through training, and that some training yields improvements that are transferable to novel contexts and tasks (Uttal et al., 2013). While the training of these spatial abilities may be valuable for some forms of STEM...
Research has found that both schizophrenia populations and populations at clinical high risk for psychosis show alterations in facial affect expressivity, specifically blunting. However, it is unknown whether these alterations occur prior to onset, or whether they develop as a consequence of psychosis onset processes. The current study sought to...
Past research suggests that stereotypes about collective identities (i.e. race, ethnicity, and gender) shape aspirations. However, less is known about how actual representation of collective identity relates to aspirations. The proportion of an identity in a given career will be used as an indicator of numeric representation and I hypothesize...
Personality traits and personal values represent individual differences that influence many forms of behavior including psychopathology (Hanel & Wolfradt, 2016; Jarden, 2010; Ozer & Benet-Martinez, 2006; Schwartz, 2006). Extensive research has highlighted the importance of personality traits in the development of psychopathology in children. However, the association between values and...
Shared emotions are associated with thriving in relationships (Anderson, Keltner & John, 2004; Gonzaga, Campos, & Bradbury, 2007), and greater liking for new individuals (Larson & Gardner, 2015). However, the psychological mechanisms underlying this phenomenon are not well-understood. Emotions are fleeting experiential states and, seen through this lens, finding someone...
This dissertation explores human coordination in rhythmic, verbal, and spatial activity, and how coordination in one of these modes may subsequently impact behavior in another mode. My research examines what effects non-conversational actions have on the alignment of spatial perspectives during conversation. I hope to clarify how data about non-linguistic...
The availability and importance of data is accelerating, and our visual system is a critical tool for understanding it. The research field of data visualization seeks design guidelines – often inspired by perceptual psychology – for more efficient visual data analysis. Data visualization can borrow phenomena, tasks, and methods of...
This dissertation examined gender differences in youth externalizing comorbidity via three studies. Study 1 was a meta-analytic review that provided the first robust estimate of gender differences in youth externalizing comorbidity. Studies 2 and 3 unpacked these gender differences at two levels of analysis: personality (Study 2 and 3) and...