Dartmouth Digital Library Program

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The effects of lesions of the cerebellar vermis and cerebellar hemispheres on conditioned and unconditioned heart-rate responses in restrained and unrestrained rats.
Cerebellum -- Experiments. ; Rats -- Behavior. ; Heart beat.
Dartmouth Dissertations

Hearing orbidfold topology.
Riemannian manifolds. ; Topological manifolds. ; Geometry Differential.
Spectral theory is the subfield of differential geometry which provided the solution to Kac''s famous question, "Can you hear the shape of a drum?" That is, can we use the Laplace spectrum of a manifold to draw conclusions about its geometry or...
Dartmouth Dissertations

Subtypes of developmental prosopagnosia : behavioral and neural evidence / by Hua Yang
Developmental prosopagnosia (DP) is a neurodevelopmental disorder defined by impaired face recognition in the absence of brain damage, low-level visual deficits, or broad cognitive problems. Behavioral and neural findings suggest different types of...
Dartmouth Dissertations

Cataclysmic variables and white dwarf-m dwarf binaries from the superblink proper motion survey / by Julie Nicole Skinner.
Cataclysmic variable stars (CVs) are close, interacting binary systems comprised of a white dwarf and a companion star, which is typically a late-type dwarf star. Their progenitor systems are post common envelope binaries (PCEBs) with a white dwarf...
Dartmouth Dissertations

Ground-based observations of auroral radio emissions.
Hiss (Radio meteorology). VLF emissions. Auroras.
Dartmouth Dissertations

Genetic inactivation of ACAT1 ameliorates the amyloid pathology and cognitive deficits in a mouse model of Alzheimer's disease.
Acyltransferases -- Genetic aspects. Enzyme inhibitors. Alzheimer's disease. Amyloid.
Acyl-CoA:Cholesterol Acyltransferases (ACATs) are key enzymes in cellular cholesterol metabolism. ACAT converts free cholesterol to cholesterol ester, which makes it more easily storable in lipid droplets. There are two ACAT genes encoding two...
Dartmouth Dissertations

The dorsal tegmental nucleus of Gudden and angular velocity integration in the head direction system.
Space perception. ; Motion perception (Vision). ; Vestibular apparatus.
Head Direction (HD) cells are neurons located primarily in the limbic system that fire as a function of directional heading in the horizontal, or yaw, plane in the freely moving animal. Our hypothesis is that the HD signal is the result of two...
Dartmouth Dissertations

On the dynamics of emotional facial expressions.
Facial expression. ; Emotions.
Dartmouth Dissertations

Within and between hand acquisition of multiple stimulus-response mappings.
Hand -- Psychophysiology. Conditioned response. Hand -- Movements. Perceptual-motor processes.
The present studies examine the flexible application of two stimulus-response (SR) mappings to a single set of stimuli. The following questions are addressed: (1) Can dual mapping performance equal single mapping performance (2) Can rapid map...
Dartmouth Dissertations

Hemispheric differences in visual information processing.
Human information processing. ; Cerebral hemispheres. ; Visual perception.
Dartmouth Dissertations

Forest structure and atmospheric interactions : predictive models for subalpine balsam fir forest
Forest hydrology -- Mathematical models; Forest Meteorology -- Mathematical models; Balsam fir
Dartmouth Dissertations

Nerve growth factor and the septohippocampal system / by Lan Guo.
Nerve growth factor (NGF), the prototypic neurotrophin, is well characterized for its pro-survival and growth effects in sympathetic and sensory neurons. Acting as a target-derived factor, NGF regulates the maturation of innervating neurons, and...
Dartmouth Dissertations

Ground and space observations of medium frequency auroral radio emissions / by Matthew C. Broughton.
The auroral zone is a rich source of natural radio emissions that can be observed in space and at ground-level. By studying these waves, scientists can gain insight into the plasma processes that generate them and use the near-Earth space...
Dartmouth Dissertations

On the nature mechanisms and neural correlates of visual feature conjunction learning / by Eric Andrew Reavis.
Visual searches for a conjunction of features (e.g., a particular combination of color and shape) are ordinarily slow and difficult. However, search efficiency for a particular conjunction can improve dramatically within a few hundred practice...
Dartmouth Dissertations

The effects of brain damage on source monitoring.
Brain damage -- Psychological aspects. Memory. Brain -- Localization of functions. Neuropsychology.
Two experiments were designed to investigate the effects of brain damage on source monitoring. Source monitoring is the process of making decisions about the origins of memories. Previous research has demonstrated that source monitoring judgments...
Dartmouth Dissertations

The effects of context and familiarity on person perception: examining the neural substrates of facial attractiveness.
Face perception -- Physiological aspects. Face perception -- Social aspects. Sex differences (Psychology). Neuropsychology.
The general objective of the current thesis was to investigate the neural substrates underlying the perception of opposite-sex faces. Building on what is already known about the distributed network of brain areas supporting various dimensions of...
Dartmouth Dissertations

Bilingual and monolingual brains compared: a fMRI study of semantic processing.
Bilingualism -- Physiological aspects. ; Neurolinguistics. Cognition -- Physiological aspects. ; Brain -- Localization of functions.
Does early and sustained experience with two languages in childhood modify how language is processed in the adult bilingual brain? Does extensive exposure to two languages influence language processing in the bilingual brain as compared to...
Dartmouth Dissertations

Chronology of Neogene tectonics in the Central Andes (27°-33° S) of western Argentina based on the magnetic polarity stratigraphy of foreland basin sediments.
Geology, Stratigraphic -- Neogene. ; Plate tectonics -- Argentina. Geology -- Argentina.
Dartmouth Dissertations

Design of a magnetic field compatible, high-performance optical breast imaging system for MRI-guided optical spectroscopy / by Fadi El-Ghussein
Multimodality imaging is becoming the standard of care for research and clinical studies. Such an approach is able to provide complementary information which can detect and characterize tumors. Advancing instrumentation for diffuse near-infrared...
Dartmouth Dissertations

The sturucture and function of brain networks underlying self-evaluation / by Robert S. Chavez
Humans have a seemingly unique capacity to reflect upon information about the self to form evaluative attitudes that influence their quality of life and predict mental health outcomes. While psychologists have devoted decades of research to the...
Dartmouth Dissertations

Measuring the seeds of thermal ion outflow / by Philip A. Fernandes
The ionosphere is the primary source for heavy ions which are ubiquitous in the terrestrial magnetosphere. Low-altitude energization in the auroral ionosphere results in bulk heating and transverse acceleration of ions, which begin to upwell and/or...
Dartmouth Dissertations

Contributions of retrosplenial cortex to associative learning and memory.
Cerebral cortex -- Psychophysiology. Learning.
Neuroanatomical studies have defined two relatively separate corticohippocampal processing streams that contribute substantially to medial temporal lobe function. Among the cortical regions providing significant input to these processing streams is...
Dartmouth Dissertations

Individual differences in callosal organization: relationship to interhemispheric communication and hemispheric asymmetries.
Corpus callosum -- Physiology. Cerebral hemispheres. Laterality. Sensorimotor integration. Brain -- Localization of functions.
The overarching goal of the dissertation was to further understanding of the relationship between callosal organization, functional lateralization, and interhemispheric communication in the healthy, young adult brain. Three converging methodologies...
Dartmouth Dissertations

Wave phenomena in the magnetosphere: auroral electromagnetic ion cyclotron waves and quasi-thermal electrostatic fluctuations.
Cyclotron waves. ; Plasma waves.
Dartmouth Dissertations

Neural and behavioral mechanisms of sensorimotor performance shifts under speed uncertainty.
Sensorimotor integration. Uncertainty -- Psychological aspects. Time pressure. Decision making -- Psychological aspects. Neurophysiology. Psychomotor Performance -- physiology.
Dartmouth Dissertations

The function of perceived gaze direction in emotion and person perception.
Gaze -- Psychological aspects. ; Facial expression. ; Body language.
The primary goal of the current research was to examine the effect of perceived gaze direction on the perception and processing of facially communicated emotion. There is good reason to believe that gaze direction and facial displays of emotion...
Dartmouth Dissertations

The cell surface of sea urchin micromeres and primary mesenchyme.
Sea urchins -- Cytology. ; Developmental cytology.
Dartmouth Dissertations

Tangles, theta graphs and solid torus pairs.
Torus (Geometry). ; Functions Theta.
Dartmouth Dissertations

Self-reconfiguring robots: designs, algorithms, and applications.
Robots -- Control systems. ; Robots -- Motion. ; Computer algorithms. ; Electronic data processing -- Distributed processing.
Self-reconfiguring robots are robots composed of many physically connected modules which can change their structural configuration to support multiple functionalities. We claim that self-reconfiguring robots are more versatile, extensible, and...
Dartmouth Dissertations

A millikelvin atomic force microscope for the investigation of mesoscopic devices.
Atomic force microscopy. ; Microscopes -- Design and construction. ; Mesoscopic phenomena (Physics).
Dartmouth Dissertations

Statistical analysis and empirical modeling of large- and small-scale plasma drifts in Earth''s high-latitude ionosphere.
Electric fields in the high-latitude regions of Earth's ionosphere are an important component of the coupled magnetosphere-ionosphere-thermosphere system. Characterizing the average behavior of these fields (or the corresponding drifts) is useful...
Dartmouth Dissertations

Perceptual filling-in involves feature mixing, but not feature replacement.
Form perception. ; Visual perception. ; Motion perception (Vision). ; Color vision. ; Visual cortex -- Psychophysiology.
Visual filling-in occurs when a retinally stabilized object undergoes perceptual fading. It is commonly believed that information about the apparently vanished object is lost and replaced solely by information arising from the surrounding...
Dartmouth Dissertations

Head direction cells, grid cells, and the neural basis of spatial orientation
Space perception -- Physiological aspects.;""Thalamus -- Physiology."";""Hippocampus (Brain) -- Physiology."";""Neural networks (Neurobiology)"";""Neural Pathways -- physiology."";""Anterior Thalamic Nuclei -- physiology"";""Entorhinal Cortex --...
Dartmouth Dissertations

The effect of ionospheric outflow on the dynamics of magnetospheric convection
The ionosphere is an important source of plasma in the magnetosphere, especially during geomagnetic storms. While satellite data has confirmed this population of ions, their effect on the dynamics of the magnetosphere-ionosphere (MI) system is not...
Dartmouth Dissertations

Diffuse tomography of absorbing and fluorescent optical exogenous contrast guided by simultaneously acquired magnetic resonance images.
Optical tomography. Fluorescence. Imaging systems -- Design and construction. Diagnostic imaging -- Mathematical models. Brain -- Diseases -- Diagnosis. Brain -- Magnetic resonance imaging.
Fluorescent molecules targeted to reveal information on tissue function have been used as research tools in ex vivo and subsurface characterization of diseased tissue for years. Exploiting this specificity for in vivo imaging through centimeters of...
Dartmouth Dissertations

Acquisition and registration of 3D optical surface scanning, MRI, and microwave tomographic imaging for improved clinical breast imaging and surgical planning / by Matthew John Pallone.
Continual improvements to clinical breast imaging technologies have led to ever earlier detections and increasingly accurate localizations of female breast cancers. While these advancements have certainly improved the prognoses of many patients,...
Dartmouth Dissertations

Sampling for complexity in rendering / by Jiawei Ou.
As the visual effect and movie industries are striving for realism and high fidelity images, physically based lighting, global illumination, realistic materials, and highly tessellated geometry are gradually accepted and used in movie and game...
Dartmouth Dissertations

Alterations in the production of bacteriochlorophyll a and okenone in purple sulfur bacteria : implications for the interpretaion of their biomarkers / by Derek A. Smith.
Purple sulfur bacteria (PSB) can dominate the nitrogen, carbon, and sulfur cycles in anoxic ecosystems via their anoxygenic photosynthetic metabolisms and are the only producers of the carotenoid, okenone, a biomarker targeted for photic zone...
Dartmouth Dissertations

Brain repair after trauma : birth and migration of immature neurons after focal traumatic brain injury in piglets and human children / by Sabrina Rose Taylor.
Traumatic brain injury (TBI) is the leading cause of acquired disability in children, yet innate repair mechanisms are incompletely understood. A possible innate mechanism to repair injury after insult is neurogenesis - the birth, migration,...
Dartmouth Dissertations

Noninvasive fluorescence monitoring for functional assessment of murine glioma treatment.
Gliomas -- Immunotherapy -- Evaluation. Fluorescence spectroscopy. Diagnosis.
Molecular optical imaging in vivo has potential for functional assessment of tumor tissue at the cellular and subcellular level. Advances in biological understanding of genomics and proteomics have increased the knowledge of possible cellular...
Dartmouth Dissertations

Lighting and optical tools for image forensics.
Image analysis. Image processing -- Digital techniques. Photography -- Retouching. Photographs -- Forgeries. Lighting. Optics. Forensic sciences.
We present new forensic tools that are capable of detecting traces of tampering in digital images without the use of watermarks or specialized hardware. These tools operate under the assumption that images contain natural properties from a variety...
Dartmouth Dissertations

Performance decrement following insolvable problems: learned helplessness or failure anxiety?
Failure (Psychology);Helplessness (Psychology)
Dartmouth Dissertations

The effect of microstructure on firn gas transport / by Kaitlin M. Keegan
The processes affecting gas transport through the firn column are important to understand in order to accurately interpret climate records from ice cores. Historically, density measurements have been used to estimate open and closed porosity in the...
Dartmouth Dissertations

Spectroscopic analyses of type Ia supernovae / by Jerod Parrent.
After decades of searching we have yet to find the progenitor systems for type Ia supernovae. In fact most of what we know about this homogeneous class of supernovae is from spectral features associated with the incinerated remains of the C+O white...
Dartmouth Dissertations

Determining anthropogenic and natural controls on the global mercury cycle using lake sediment and ice cores ; by Samuel Adams Beal Jr.
While anthropogenic emissions of the toxic element mercury (Hg) to the atmosphere are currently rising, major uncertainties remain in determining the relative impacts of anthropogenic activity and natural processes on the global Hg cycle. In this...
Dartmouth Dissertations

System and methodology for receptor-level fluorescence imaging during surgery / by Kristian Sexton.
Fluorescence molecular imaging will have an important clinical impact in the area of guided oncology surgery, where emerging technologies are poised to provide the surgeon with real-time molecular information to guide resection, using targeted...
Dartmouth Dissertations

Multimodal electroencephalography and near-infrared spectroscopy neuroimaging measurement and analysis / by Paolo Giacometti
This project focuses on the development of research tools and methods that are used to study the relationship between neural activity and subsequent hemodynamic responses in the human brain. This relationship, referred to as neurovascular coupling,...
Dartmouth Dissertations

Memory consolidation in temporal lobe epilepsy / by Ali Seçkin Titiz.
Epilepsy is associated with cognitive impairments which often manifest as a higher prevalence of memory impairments. Memory impairments in patients with epilepsy may persist even with sufficient control of seizures, suggesting other factors may...
Dartmouth Dissertations

Sex-specific interactions of anabolic androgenic steroids with voluntary exercise and chronic alcohol consumption on anxiety-like behaviors in mice (Mus musculus) / by Marie Morenike Onakomaiya.
The overarching goal of this thesis was two-fold. First, to determine if the effects of chronic anabolic androgenic steroid (AAS) treatment on anxiety-like behaviors are sex-specific and second to determine how different environmental modulators...
Dartmouth Dissertations

Late glacial and holocene fluctuations of local glaciers and the Greenland Ice Sheet eastern and western Greenland / by Laura B. Levy.
The Greenland Ice Sheet (GrIS) is responding sensitively to climate change and its meltwater has the potential to influence global sea level. Recently, large changes in the GrIS have occurred including increased velocities of outlet glaciers and...
Dartmouth Dissertations

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