Behavior and Behavior Mechanisms Commons^™

Is Younger Really Better? Age Differences In Emotion Perception, Kaitlyn Snyder

Mahurin Honors College Capstone Experience/Thesis Projects

Previous research suggests that younger adults outperform older adults on emotion-matching tasks because emotion recognition ability declines with age. These studies involved tasks in which participants identified a target emotion by selecting from multiple verbal labels. The use of multiple verbal labels placed great cognitive demand on participants, influencing the results that were found in such studies. In the present study, a computer emotion-matching task was used to determine differences between younger and older adults when presented with a target stimulus expressing one of five emotions (anger, fear, disgust, happiness, and sadness) and asked to match the target emotion to …

A Critical Evaluation Of Selective Attention Measures, Hannah K. Wilson

Mahurin Honors College Capstone Experience/Thesis Projects

Selective attention is comprised of two simultaneous processes—the inhibition of distractors and the focus of attention on target stimuli; yet, many existing selective attention measures only measure one aspect of selective attention. This leads to a high possibility of Type I errors as high interference control or high working memory capacity may be mistaken for high selective attention. This paper proposes several criteria for high construct validity and external validity in selective attention measures.

Concerning construct validity, the test must allow participants to exercise selective attention, adequately measure the level of attention to the distractor stimuli, and adequately measure level …

Failure To Launch? Understanding Variations In Emerging Adult Flight Patterns, Christina Ashley Williams

Graduate Theses and Dissertations

What does the transition to adulthood look like for emerging adults? This study proposes that popular cultural ideas like "failure to launch" imply an oversimplified dichotomy that does not account for the multiple "flight patterns" into adulthood. Focusing on the narratives of six interview cases selected from the larger sample of interviewees from Wave 4 of the National Study of Youth and Religion and drawing on the quantitative data from the broader survey sample, this mixed-methods approach examines in-depth, narrative experiences and the ways structural barriers vary between upper-middle, lower-middle, and working class emerging adults. We find that emerging adulthood …

Oscillatory Activity In The Subthalamic Nucleus And Motor Cortex In A Pharmacological Model Of Parkinsonian Tremor, Aileen F. Haque

Honors Scholar Theses

Parkinson’s Disease (PD) is a motor disorder with symptoms including resting tremor, akinesia, bradykinesia, and rigidity. A major neuropathological feature of PD is degeneration of nigrostriatal dopamine (DA) neurons. The resulting DA depletions lead to the production of severe motor deficits. Pharmacological agents that reduce DA transmission can also induce these motor abnormalities. In addition to the involvement of DA, drugs acting on acetylcholine, namely cholinomimetics, can induce or exacerbate Parkinsonian symptoms. In humans, one of the main motor symptoms associated with PD is resting tremor, occurring at a frequency of 3-7 Hz. This can be modeled in rodents using …

Exploring The Relationship Between Early Childhood Attentional Control And Language Ability, Jaima S. Price

Electronic Theses and Dissertations

Relatively few studies have investigated the relationship between early childhood attentional control and later cognitive outcomes, especially language development. The current study is an investigation of the relationship between the executive functioning (EF) component of attentional control and language ability in the second year of life. More specifically, the predictive nature of two aspects of attentional control, attentional focus and resistance to distraction, was be the primary focus of the proposed study. Although it was expected that children both high in attentional focus and resistance to distraction would have significantly superior language development than infants with lower attentional capacities, analyses …

Handling Human Hacking: Creating A Comprehensive Defensive Strategy Against Modern Social Engineering, Charles Snyder

Senior Honors Theses

Social engineering is one of the most devastating threats to any company or business. Rather than relying upon technical flaws in order to break into computer networks, social engineers utilize a suave personality in order to deceive individuals through clever conversation. These devious conversations frequently provide the attacker with sufficient information to compromise the company’s computer network. Unlike common technical attacks, social engineering attacks cannot be prevented by security tools and software. Instead of attacking a network directly, a social engineer exploits human psychology in order to coerce the victim to inadvertently divulge sensitive information. Further complicating the issue, the …

Brief Report: Evidence Of Ingroup Bias On The Shooter Task In A Saudi Sample, Timothy P. Schofield, Timothy Deckman, Christopher P. Garris, C. Nathan Dewall, Thomas F. Denson

Psychology Faculty Publications

When predominantly White participants in Western countries are asked to shoot individuals in a computer game who may carry weapons, they show a greater bias to shoot at outgroup members and people stereotyped as dangerous. The goal was to determine the extent to which shooter biases in the Middle East would vary as a function of target ethnicity and culturally appropriate or inappropriate headgear. Within a sample of 37 male Saudi Arabian residents, we examined shooter biases outside of Western nations for the first time. Targets in this task were either White or Middle Eastern in appearance, and wore either …

Belief About Nicotine Selectively Modulates Value And Reward Prediction Error Signals In Smokers, Xiaosi Gu, Terry Lohrenz, Ramiro Salas, Philip R. Baldwin, Alireza Soltani

Dartmouth Scholarship

Little is known about how prior beliefs impact biophysically described processes in the presence of neuroactive drugs, which presents a profound challenge to the understanding of the mechanisms and treatments of addiction. We engineered smokers' prior beliefs about the presence of nicotine in a cigarette smoked before a functional magnetic resonance imaging session where subjects carried out a sequential choice task. Using a model-based approach, we show that smokers' beliefs about nicotine specifically modulated learning signals (value and reward prediction error) defined by a computational model of mesolimbic dopamine systems. Belief of "no nicotine in cigarette" (compared with "nicotine in …

The Neurophysiology Of Intersensory Selective Attention And Task Switching, Jeremy W. Murphy

Dissertations, Theses, and Capstone Projects

Our ability to selectively attend to certain aspects of the world and ignore others is fundamental to our day-to-day lives. The need for selective attention stems from capacity limitations inherent in our perceptual and cognitive processing architecture. Because not every elemental piece of our environment can be fully processed in parallel, the nervous system must prioritize processing. This prioritization is generally referred to as selective attention. Meanwhile, we are faced with a world that is constantly in flux, such that we have to frequently shift our attention from one piece of the environment to another and from one task to …

Spatial And Temporal Characteristics Of Error-Related Activity In The Human Brain, Maital Neta, Francis M. Miezin, Steven M. Nelson, Joseph W. Dubis, Nico U.F. Dosenbach, Bradley L. Schlaggar, Steven E. Petersen

Center for Brain, Biology, and Behavior: Faculty Publications

A number of studies have focused on the role of specific brain regions, such as the dorsal anterior cingulate cortex during trials on which participants make errors, whereas others have implicated a host of more widely distributed regions in the human brain. Previous work has proposed that there are multiple cognitive control networks, raising the question of whether error-related activity can be found in each of these networks. Thus, to examine error-related activity broadly, we conducted a meta-analysis consisting of 12 tasks that included both error and correct trials. These tasks varied by stimulus input (visual, auditory), response output (button …

Exposure To Kynurenic Acid During Adolescence Increases Sign-Tracking And Impairs Long-Term Potentiation In Adulthood, Nicole E. Deangeli, Travis P. Todd, Stephen E. Chang, Hermes H. Yeh, Pamela W. Yeh, David J. Bucci

Dartmouth Scholarship

Changes in brain reward systems are thought to contribute significantly to the cognitive and behavioral impairments of schizophrenia, as well as the propensity to develop co-occurring substance abuse disorders. Presently, there are few treatments for persons with a dual diagnosis and little is known about the neural substrates that underlie co-occurring schizophrenia and substance abuse. One goal of the present study was to determine if a change in the concentration of kynurenic acid (KYNA), a tryptophan metabolite that is increased in the brains of people with schizophrenia, affects reward-related behavior. KYNA is an endogenous antagonist of NMDA glutamate receptors and …

Which Methods Of Treating Attention Deficit Hyperactive Disorder Are Most Effective And Most Closely Match Patient Lifestyle?, Yehudit Erlbaum

The Science Journal of the Lander College of Arts and Sciences

ADHD, attention deficit hyperactive disorder, is a disorder characterized by hyperactivity, inattentiveness, inability to remain on task, fidgetiness, and impulsivity. An over absorption of dopamine by the dopamine transporters leads to a lack of dopamine, the inhibiting neurotransmitter in the brain, resulting in the inability for the individual to inhibit their impulses. The disease is most likely seen in children but may continue into adulthood. The length of the disease across the individual’s life span, results in expensive treatment, whether it be medication or Cognitive Behavior Therapy, CBT. Therefore, these medical costs have caused researchers to find the most efficient …

The Need For Theory To Guide Concussion Research, Dennis Molfese

Center for Brain, Biology, and Behavior: Faculty Publications

While the focus on concussion research has expanded greatly over the past decade, progress in identifying the mechanisms and consequences of head injury, the recovery path and the development of potential interventions to facilitate recovery have been largely absent. Instead, the field has largely progressed through an accumulation of data without the guidance of any systematic theory to guide the formulation of research questions or generate testable hypotheses. As part of this special issue on sports concussion, we advance a theory to describe the evolution of a neural network during the development of a cognitive process as well as the …

Resting-State Brain Connectivity After Surgical And Behavioral Weight Loss, Rebecca J. Lepping, Amanda S. Bruce, Alex Francisco, Hung-Wen Yeh, Laura E. Martin, Joshua N. Powell, Laura Hancock, Trisha M. Patrician, Florence J. Breslin, Niazy Selim, Joseph E. Donnelly, William M. Brooks, Cary R. Savage, W. Kyle Simmons, Jared M. Bruce

Center for Brain, Biology, and Behavior: Faculty Publications

Objective: Changes in food-cue neural reactivity associated with behavioral and surgical weight loss interventions have been reported. Resting functional connectivity represents tonic neural activity that may contribute to weight loss success. This study explores whether intervention type is associated with differences in functional connectivity after weight loss. Methods: Fifteen participants with obesity were recruited prior to adjustable gastric banding surgery. Thirteen demographically matched participants with obesity were selected from a separate behavioral diet intervention. Resting-state functional magnetic resonance imaging was collected 3 months after surgery/ behavioral intervention. ANOVA was used to examine post-weight loss differences between the two groups in …

Differences In Prefrontal Cortex Activation And Deactivation During Strategic Episodic Verbal Memory Encoding In Mild Cognitive Impairment, Joana B. Balardin, Marcelo C. Batistuzzo, Maria Da Graca Moraes Martin, Joao R. Sato, Jerusa Smid, Claudia Porto, Cary R. Savage, Ricardo Nitrini, Edson Amaro Jr., Eliane C. Miotto

Center for Brain, Biology, and Behavior: Faculty Publications

In this study we examined differences in fMRI activation and deactivation patterns during episodic verbal memory encoding between individuals with MCI (n = 18) and healthy controls (HCs) (n = 17). Participants were scanned in two different sessions during the application of self-initiated or directed instructions to apply semantic strategies at encoding of word lists. MCI participants showed reduced free recall scores when using self-initiated encoding strategies that were increased to baseline controls' level after directed instructions were provided. During directed strategic encoding, greater recruitment of frontoparietal regions was observed in both MCI and control groups; group differences …

The Relationship Between Coaching Environment And Athlete Attributional Style, Una Britton

Online Theses and Dissertations

This study examined the relationship between attributional style and perceived coaching behaviors in collegiate cross-country/track and field athletes in the USA and Ireland. Participants included seventy-three collegiate athletes (Ireland: n = 24 male, n = 18 female, mean ± SD age: 20.39 ± 1.61 years. USA: n = 9 male, n = 22 female, mean ± SD age: 21.02 ± 2.18 years). Participants completed the Sport Attributional Style Scale (SASS; Hanrahan et al., 1989) and the Leadership Scale for Sport (LSS; Chelladurai & Selah, 1980) to assess attributional style and perceived coaching behaviors. Explanatory pessimism, total internality, stability, and globality …

Biological Basis Of Motherhood And Effect Of Stress On Maternal Psychophysiology, Erin Loree Minnick 15

Honor Scholar Theses

No abstract provided.

Youth With Type 1 Diabetes Mellitus: An Examination Of Adolescents’ Illness Perceptions And Associated Impact On Health-Related Quality Of Life, Zainab Shahpurwala

Electronic Theses and Dissertations

Objectives: To examine the impact of various psychosocial factors (perceived stress, diabetes-specific parental involvement, self-efficacy for diabetes management, and perceived peer support) on adolescents’ self-reported health-related quality of life (HRQoL) and assess the association between these factors and their self-reported HRQoL. To determine if differences in perceptions exist between diabetes camp and non-camp adolescent attendees on the various aforementioned psychosocial factors and their impact on their HRQoL. Methods: The study employed a cross-sectional, non-experimental, quantitative design to address the aforementioned objectives. Adolescents were recruited from multiple sites including diabetes summer camps and university-based and community-based private clinics. Self-administered paper-based surveys …

Using The Symmetry Of False Matches To Solve The Correspondence Problem, Cherlyn J. Ng, Bart Farell

Biomedical and Chemical Engineering - All Scholarship

Veridical stereoscopic depth depends on matching corresponding image points. This requires solving the stereo correspondence problem: how are true matches distinguished from false ones? Conventional algorithms select true matches on the basis of feature detection [what do you mean by ‘feature detection’ here? Is there some more specific term?] and adherence to natural statistics. They reject false matches as noise. We propose here an alternative that uses the signals present in false matches to delineate the true solution. When visualized in a Keplerian array, binocular matches are symmetrically reflected about an axis that is a potential solution. Properties such as …

Adhd Children And Mental Health Service Use: Maternal Determinants, Katarina Krizova

Theses and Dissertations--Family Sciences

The current study investigated maternal determinants of mental health service use, namely, individual child therapy, among preadolescent children diagnosed with ADHD. The Behavioral Model of Health Care Utilization (Andersen, 2008) was used as a theoretical framework for the study. Data from the last three rounds of ECLS-K dataset were employed to test a longitudinal model using Bayesian analysis. Socio-demographic variables and maternal mental health were tested as exogenous variables and mother-child relationship variables, discipline variables, and perceived maternal concern about child’s overall behavior and child’s emotional symptoms were tested as intervening variables. Results showed that only maternal mental health remained …