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Articles 31 - 60 of 74

Full-Text Articles in Neuroscience and Neurobiology

Synaptic Properties Of Parabigeminal Circuits., Kyle Whyland May 2023

Synaptic Properties Of Parabigeminal Circuits., Kyle Whyland

Electronic Theses and Dissertations

Subcortical structures of the visual system have been the subject of intense study in recent years, but there remain some important unanswered questions regarding the synaptic relationships linking the nuclei that comprise this important sensory network within the brain. In these studies, we use several modern and traditional approaches, including viral tract tracing, in vitro slice physiology, immunohistochemistry, optogenetics, and electron microscopy to characterize the circuits linking the superior colliculus (SC), parabigeminal nucleus (PBG), and lateral geniculate nucleus (LGN), with particular focus on GABAergic and cholinergic cell types. We found that the SC, an important visuomotor structure with connections to …

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An Investigation Into Structural Plasticity In Peripheral Taste Neurons Associated With Taste Cell Turnover., Zachary Whiddon May 2023

An Investigation Into Structural Plasticity In Peripheral Taste Neurons Associated With Taste Cell Turnover., Zachary Whiddon

Electronic Theses and Dissertations

The continual replacement of taste cells creates interesting questions regarding how the innervating neurons are impacted during this process. Here we ask how innervation within taste buds is affected when taste cell entry is inhibited and reestablished. Inhibition of sonic hedgehog signaling (Shh) is thought to inhibit taste cell turnover. Consistently, fewer new cells were added to individual taste buds after treatment with a Shh-inhibitor compared to vehicle treatment, and taste bud volume decreased after 16 days of treatment. We next examined how taste nerve fiber extension into the gustatory epithelium is affected by preventing taste cell turnover. Ten days …

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Perineuronal Nets Are Not Required To Close The Critical Period For Ocular Dominance Plasticity., Emily Crouse May 2023

Perineuronal Nets Are Not Required To Close The Critical Period For Ocular Dominance Plasticity., Emily Crouse

Electronic Theses and Dissertations

In the developing visual system, a transient critical period demarcates when neural circuits are most sensitive to visual experience. In the mouse, the critical period occurs between approximately postnatal day(P) 19 to 32. Closing one eye (monocular deprivation, MD) within the critical period shifts ocular dominance (OD) to be more responsive to the open eye. Nogo-66 Receptor 1 (NGR1) limits OD plasticity to the critical period yet it remains unknown how OD plasticity propagates through primary visual cortex or by which mechanisms NGR1 utilizes to confine said plasticity. In primary studies, NGR1 was selectively deleted in different cortical layers to …

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Chemosensory Processing By The Mediodorsal Thalamus., Kelly Fredericksen May 2023

Chemosensory Processing By The Mediodorsal Thalamus., Kelly Fredericksen

Electronic Theses and Dissertations

The mediodorsal thalamus (MD) is thought to be key component of the network that processes chemosensory information to guide our consummatory choices. Previous studies show that the mediodorsal thalamus receives projections from both the piriform cortex (PC) and gustatory cortex (GC), suggesting that it may process chemosensory information from both areas. Although the mediodorsal thalamus has been shown to respond to odors detected by sniffing, it remains unknown how its neurons represent experienced odors, tastes, and odor-taste mixtures originating from the mouth. Importantly, humans and animals with mediodorsal thalamic lesions do not suffer from anosmia, but experience deficits in odor …

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Supraspinal Reorganization After Pediatric-Onset Spinal Cord Injury., Luis Alvarado May 2023

Supraspinal Reorganization After Pediatric-Onset Spinal Cord Injury., Luis Alvarado

Electronic Theses and Dissertations

Pediatric spinal cord injury (SCI) disrupts the efferent and afferent flow of the developing brain, leading to devastating functional impairments below the injury site, yet our understanding of its impact on the brain remains limited. This study examines supraspinal reorganization in children with SCI using electrophysiology and neuroimaging techniques to understand the relationship between residual spinal transmission and supraspinal reorganization. Chapter 2 discusses the development of a child-centric approach using ‘learn, play, and practice’ to foster a trusting relationship with each child and increase compliance with experimental protocols. Chapter 3 evaluates the residual neural transmission of three spinal pathways in …

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Novel Model For Tau Protein Expression And Function: The Honeybee Brain, Abdallah F. Sher Apr 2023

Novel Model For Tau Protein Expression And Function: The Honeybee Brain, Abdallah F. Sher

2023 Midwest Ecology & Evolution Conference

Scientists have long attempted to understand the mechanisms by which senescence occurs. Leading theories suggest that aging is an emergent property of natural selection’s prioritization of reproductive ability. Social insects, such as the honeybee (Apis mellifera) challenge this idea, separating colonies into reproductive and non-reproductive castes. Worker honeybees do not reproduce, suggesting that selection prioritizes tasks other than reproduction. Forager honeybees, for example, display improved cognitive and immune function compared to other behavioral phenotypes of bees, likely to support their ability to perform tasks such as navigating complex environments or making context-dependent decisions while foraging. Foragers are normally older honeybees, …

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The Intersection Between Toxicology And Aging Research: A Toxic Aging Coin Perspective., John P. Wise Jr. Sep 2022

The Intersection Between Toxicology And Aging Research: A Toxic Aging Coin Perspective., John P. Wise Jr.

Faculty and Staff Scholarship

We are imminently faced with the challenges of an increasingly aging population and longer lifespans due to improved health care. Concomitantly, we are faced with ubiquitous environmental pollution linked with various health effects and age-related diseases which contribute to increased morbidity with age. Geriatric populations are rarely considered in the development of environmental regulations or in toxicology research. Today, life expectancy is often into one’s 80s or beyond, which means multiple decades living as a geriatric individual. Hence, adverse health effects and late-onset diseases might be due to environmental exposures as a geriatric, and we currently have no way of …

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Effect Of Dorsal Quadrant Or Ventral Quadrant Spinal Cord Injury On Gait Features During Locomotion., Anya Nicole Trell Aug 2022

Effect Of Dorsal Quadrant Or Ventral Quadrant Spinal Cord Injury On Gait Features During Locomotion., Anya Nicole Trell

Electronic Theses and Dissertations

In the Unites States, approximately 1.5 million people currently have a spinal cord injury and suffer permanent sensory and motor loss due to the disruption of the spinal cord. Due to the significant morbidity, it is vital to understand the functional impact of disrupting neural descending pathways that modulate spinal neurons involved in intermuscular coordination critical for gait behaviors. Tasks that are more difficult require additional input from these neural pathways; therefore, fourteen feline subjects were familiarized with level overground locomotion and stair descent gait tasks. After collection of baseline kinematic data, the subjects received either a dorsal or ventral …

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Adjusting For Speaking Rate When Perceiving Speech In Background Noise., Dawson C Stephens May 2022

Adjusting For Speaking Rate When Perceiving Speech In Background Noise., Dawson C Stephens

College of Arts & Sciences Senior Theses

Speech perception is a very relevant concept occurring every day. Acoustic context effects such as temporal contrast effects (TCEs) influence perception significantly. For instance, when a faster context sentence is spoken, the participant should perceive the following target word as slower and more like /t/ in “tier”; when a slower context sentence is spoken, the participant should perceive the following target sound as faster and more like /d/ in “deer”. Recent work by Bosker et al. (2020) concluded that selective attention (directing attention to a specific stimulus while ignoring surrounding stimuli) had no effect on TCEs, suggesting they were automatic …

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Investigations Of Potential Mechanisms Underlying Spinal Cord Injury-Induced Polyuria., Jason H. Gumbel Dec 2021

Investigations Of Potential Mechanisms Underlying Spinal Cord Injury-Induced Polyuria., Jason H. Gumbel

Electronic Theses and Dissertations

Spinal cord injury (SCI) results in neurological impairments including motor, sensory, and autonomic dysfunction. These neurological deficits result in a litany of complications apart from muscular paralysis, including bladder, bowel, cardiovascular, and sexual function. SCI-induced polyuria (the overproduction/passage of urine) remains understudied, and therefore mechanisms behind it are largely unknown and require extensive investigation for potential targeted therapies to improve quality of life. The objective of this dissertation was to investigate potential mechanisms of SCI-induced polyuria and explore potential therapies to improve quality of life in the SCI population. Metabolic cages, Western blot, enzyme-linked immunoassay, and immunostaining were first used …

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The Effects Of Alcohol On The Developing Drosophila Nervous System, Erica E. Hassoun Sep 2021

The Effects Of Alcohol On The Developing Drosophila Nervous System, Erica E. Hassoun

The Cardinal Edge

Ethanol is the most common human teratogen, contributing to fetal alcohol syndrome (FAS) when effects are the most severe. Key effects of fetal alcohol syndrome are observed in the nervous system. The high prevalence of prenatal alcohol exposure necessitates novel treatment and prevention methods. However, ethical issues prevent researching humans in utero. For this reason, the fruit fly Drosophila melanogaster has emerged as a model organism for studying FAS. Because Drosophila is a small and non-placental organism, its environment can be easily controlled, allowing for specific doses and time periods of ethanol exposure to be studied. This review discusses findings …

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The Motion Aftereffect: Mechanisms And Variants, Erica E. Hassoun Sep 2021

The Motion Aftereffect: Mechanisms And Variants, Erica E. Hassoun

The Cardinal Edge

The motion aftereffect causes a visual stimulus to undergo apparent motion. An adapting stimulus, which moves in a specific direction, adapts motion-responsive neurons in the middle temporal area (V5) to that direction of motion. Viewing a second stimulus, a test stimulus, produces apparent motion in the direction opposite that of the initial stimulus. Neural networks involved in attention and working memory are also implicated in the motion aftereffect. There is still little known regarding the mechanisms of the motion aftereffect, despite extensive documentation in the literature. This review discusses established knowledge of the motion aftereffect, focusing primarily on the middle …

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Medical Schools Ignore The Nature Of Consciousness At Great Cost, Anoop Kumar Jul 2021

Medical Schools Ignore The Nature Of Consciousness At Great Cost, Anoop Kumar

Journal of Wellness

The essential question of the relationship between consciousness and matter is ignored in medical school curricula, leading to a machine-like view of the human being that contributes to physician burnout and intellectual dissatisfaction. The evidence suggesting that the brain may not be the seat of consciousness is generally ignored to preserve the worldview of the primacy of matter. By investigating new frameworks detailing the nature of consciousness at different levels of hierarchy, we can bring intellectual rigor to a once opaque subject that supports a fundamental reality about our experience: We are human beings, not only human bodies.

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Early Communication Abilities Of 24-Month-Old Children With Williams Syndrome As Measured By The Communication Complexity Scale., Sean B. Woods May 2021

Early Communication Abilities Of 24-Month-Old Children With Williams Syndrome As Measured By The Communication Complexity Scale., Sean B. Woods

College of Arts & Sciences Senior Theses

Williams syndrome (WS) is a neurodevelopmental disorder associated with intellectual disability accompanied by a distinct cognitive profile. Despite their socially outgoing nature, children with WS exhibit delayed communication development and specific deficits across various functions of communication. The purpose of this study was to describe the range of communication complexity observed in 24-month-olds with WS and determine relations between communication complexity and other areas of cognitive development. The communication complexity of 17 24-month-old children with WS was measured using the Communication Complexity Scale (CCS), which quantifies optimal and typical communication complexity, as well as optimal communication for Joint Attention (JA) …

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The Neural Architecture Of Emotional Intelligence., Teodora Stoica May 2021

The Neural Architecture Of Emotional Intelligence., Teodora Stoica

Electronic Theses and Dissertations

Emotional Intelligence (EI) is a nebulous concept that permeates daily interpersonal communication. Despite prolific research into its benefits, EI subjective measurement is difficult, contributing to an enigmatic definition of its core constructs. However, neuroimaging research probing socioaffective brain mechanisms underlying putative EI constructs can add an objective perspective to existing models, thereby illuminating the nature of EI. Therefore, the primary aim of this dissertation is to identify brain networks underlying EI and examine how EI arises from the brain’s functional and structural neuroarchitecture. EI is first defined according to behavioral data, which suggests EI is made up of two core …

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Genus Applications For Alzheimer's Disease Pathology, Whitney L Carter Jan 2021

Genus Applications For Alzheimer's Disease Pathology, Whitney L Carter

Undergraduate Arts and Research Showcase

Estimates vary, but it is thought that 5.5 million Americans age 60 and up may be living with Alzheimer’s diseases (AD). AD is the most common type of dementia and is characterized by a decline in episodic memories, long-term memory, language, attention, and personality changes. The first symptoms can vary, but for most people memory is the first capacity to become impaired. However, symptoms can also be a decline in non-memory aspects of cognition like work-finding, vision/spatial issues, and impaired reasoning or judgement. AD is identified mainly by two histopathological features: extracellular plague of amyloid-beta protein and intracellular neuronal tangles …

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Curation Techniques Of Small-Sized Natural History Specimens: A Collection Of Microfossils., Zachary V Biven-Leslie, Guillermo W. Rougier Jan 2021

Curation Techniques Of Small-Sized Natural History Specimens: A Collection Of Microfossils., Zachary V Biven-Leslie, Guillermo W. Rougier

Undergraduate Arts and Research Showcase

Small-sized fossil specimens are challenging regarding safety, storage and traceability of information. A recent collection of several hundred minute early mammalian teeth and jaws (most about 1mm) made impossible the standard practices of specimen numbering. A reliable association of the specimen and the collection number is the minimum required, however, a number of other data easily recoverable from the specimen/curating material is desirable. Geological provenance, locality, systematic and anatomical ID, collector, year, etc. is often included if possible. Use of the specimen is expected to be on the order of hundreds of years, manipulated by investigators, transported, and stored in …

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Hippocampal Learning And Number Processing In Young Children, Thomas R Pilger, Manal Zafar, Nicholas Hindy Jan 2021

Hippocampal Learning And Number Processing In Young Children, Thomas R Pilger, Manal Zafar, Nicholas Hindy

Undergraduate Arts and Research Showcase

Children can enumerate the number of objects in a configuration in different ways: either through numerical processing or pattern recognition. An example of numerical processing is a child counting or subitizing a small number of disorganized blocks. This numerical cognition is related to neural processes in the intraparietal sulcus (IPS). Moreover, a child might be able to instantly know the value a configuration represents. For example, a child could instantly recognize a pattern seen on dice and know what value it represents. Recognizing previously seen patterns is related to neural processes in the hippocampus. Using fMRI and an at-home training …

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Screen Usage Relates To Neuroanatomy Underlying Reward Processing., Lucus Kiger Hodge May 2020

Screen Usage Relates To Neuroanatomy Underlying Reward Processing., Lucus Kiger Hodge

College of Arts & Sciences Senior Theses

Today’s world is inundated with technology and our use of screens. It is possible that screen usage might affect the structural development of brain systems underlying motivation, reward, and addiction. Two hundred and thirty-two 10-year-old individuals’ structural MRI and behavioral data from a publicly accessible database were analyzed to find relations between the cortical and subcortical regions of the reward circuits of the brain and the usage of social media, texting, television, YouTube and other video applications, video games, and video chat applications. Both cortical and subcortical results yielded significant relationships with variables of screen time usage. Most significantly, subcortical …

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Cardiomyocyte Morphology Following Severe Spinal Cord Contusion In Rodents., Addison D. Riney May 2020

Cardiomyocyte Morphology Following Severe Spinal Cord Contusion In Rodents., Addison D. Riney

College of Arts & Sciences Senior Theses

Spinal cord injury (SCI) is typically a traumatic event that impacts a patient's physical, psychological, and social well-being by damaging motor and sensory neurons and altering autonomic function leading to cardiac remodeling (42). Spinal cord injuries are based on a scale of severity, with severe, high-level lesions strongly correlating to the degree of cardiovascular dysfunction. (30)(37)(41). The decline in cardiovascular function is prevalent after high thoracic SCI, with patients suffering from daily bouts of orthostatic hypotension (OH) and autonomic dysreflexia (AD), both of which prevent and delay rehabilitation efforts and lessen quality of life after …

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Formation, Organization, And Synaptic Properties Of Circuits Between Thalamic Reticular Nucleus And Dorsal Lateral Geniculate Nucleus., Peter W. Campbell May 2020

Formation, Organization, And Synaptic Properties Of Circuits Between Thalamic Reticular Nucleus And Dorsal Lateral Geniculate Nucleus., Peter W. Campbell

Electronic Theses and Dissertations

The thalamic reticular nucleus (TRN) is an interface between thalamus and cortex that regulates thalamocortical rhythms and modulates sensory processing. Thalamocortical axon collaterals provide feedforward excitatory input onto GABAergic TRN neurons, which in turn convey feedback inhibition to dorsal thalamus. Here we used the mouse visual system to study the organization, pattern of innervation and functional responses between TRN and the dorsal lateral geniculate nucleus (dLGN). We used genetically modified mice to target components of this feedback loop (feedforward: CRH-Cre; feedback: GAD65 or SST-Cre) and we created Math 5-/- strains to examine the impact of visual deaffrentation in these …

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Anxiety And How To Control It: The Functional Role Of The Bed Nucleus Of The Stria Terminalis., Lindsay K. Knight May 2020

Anxiety And How To Control It: The Functional Role Of The Bed Nucleus Of The Stria Terminalis., Lindsay K. Knight

Electronic Theses and Dissertations

Anxiety disorders afflict up to one third of the population. Research to date has primarily focused on the amygdala, however, new perspectives suggest that a tiny basal forebrain region known as the bed nucleus of the stria terminalis (BNST) may hold key insights into understanding and treating anxiety disorders. Therefore, my first aim was to empirically investigate the importance and influence of the BNST in anxiety processing. Using fearful faces and human screams as aversive stimuli, two threat conditions were created: one in which threats were certain and predictable (fear) and another in which threats were uncertain and unpredictable (anxiety). …

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The Role Of Inter-Enlargement Propriospinal Neurons In Locomotion Following Spinal Cord Injury., Courtney Therese Shepard May 2020

The Role Of Inter-Enlargement Propriospinal Neurons In Locomotion Following Spinal Cord Injury., Courtney Therese Shepard

Electronic Theses and Dissertations

The focus of this dissertation is to explore the functional role of two anatomically-defined pathways in the adult rat spinal cord before and after spinal cord injury (SCI). To do this, a TetOn dual virus system was used to selectively and reversibly silence neurons with cell bodies at spinal segment L2 and projections to spinal segment C6 (long ascending propriospinal neurons, LAPNs) and neurons that originate in the C6 spinal segment and terminate at L2 spinal segment (long descending propriospinal neurons, LDPNs). This dissertation is divided into five chapters. Chapter One provides background information regarding spinal cord injury, locomotion, …

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Glycine Inhibition On-Off Directionally Selective Retinal Ganglion Cells., Madeline C Mitchell, Maureen Mccall Ph.D Apr 2020

Glycine Inhibition On-Off Directionally Selective Retinal Ganglion Cells., Madeline C Mitchell, Maureen Mccall Ph.D

Undergraduate Arts and Research Showcase

Retinal ganglion cells (RGCs) are a group of over 40 different types that use both GABAergic and Glycenergic inhibition. There are four different types of Glycine receptors (GlyRs) known as GlyRα1, GlyRα2, GlyRα3, and GlyRα4 (Sanes & Masland, 2015; C. Zhang & McCall, 2012). Electrophysiological data has supported the theory that the RGC cell type On-Off directionally selective (ooDS) cells express both GlyRα4 and GlyRα2. If ooDS cells do express only GlyRα4 and GlyRα2, an immunohistochemical analysis of these cells should support this theory. By comparing the expression of GlyRα4 and GlyRα2 in Glra4-/- , Glra2-/- Glra4-/- , and Glra2-/- …

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Understanding Object Motion Encoding In The Mammalian Retina., Victor Julian Depiero Dec 2019

Understanding Object Motion Encoding In The Mammalian Retina., Victor Julian Depiero

Electronic Theses and Dissertations

Phototransduction, transmission of visual information down the optic nerve incurs delays on the order of 50 – 100ms. This implies that the neuronal representation of a moving object should lag behind the object’s actual position. However, studies have demonstrated that the visual system compensates for neuronal delays using a predictive mechanism called phase advancing, which shifts the population response toward the leading edge of a moving object’s retinal image. To understand how this compensation is achieved in the retina, I investigated cellular and synaptic mechanisms that drive phase advancing. I used three approaches, each testing phase advancing at a …

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Defects In Fetal Mouth Movement And Pharyngeal Patterning Underlie Cleft Palate Caused By Retinoid Deficiency., Regina Friedl May 2019

Defects In Fetal Mouth Movement And Pharyngeal Patterning Underlie Cleft Palate Caused By Retinoid Deficiency., Regina Friedl

Electronic Theses and Dissertations

Cleft palate is a common birth defect. Etiologic mechanisms of palate cleft include defects in palate morphogenesis, mandibular growth, or spontaneous fetal mouth movement. Cleft palate linked to deficient fetal mouth movement has been demonstrated directly only in a single experimental model of loss of neurotransmission. Here, using retinoid deficient mouse embryos, we demonstrate directly for the first time that deficient fetal mouth movement and cleft palate occurs as a result of mis-patterned development of pharyngeal peripheral nerves and cartilages. Retinoid deficient embryos were generated by inactivation of retinol dehydrogenase 10 (Rdh10), which is critical for production of …

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Glycine Receptor Expression Across Identified Retinal Ganglion Cell Types., Ian Scot Pyle May 2019

Glycine Receptor Expression Across Identified Retinal Ganglion Cell Types., Ian Scot Pyle

Electronic Theses and Dissertations

Retinal ganglion cells (RGCs) represent the culmination of all retinal signaling and their output forms the substrate for vision throughout the rest of the brain. About 40 different RGC types have been defined by differences in their visually evoked responses, morphology, and genetic makeup. These responses arise from interactions between inhibition and excitation throughout the retinal circuit (Franke et al., 2017; Masland, 2012; Sanes & Masland, 2015; Werblin, 2011). Unlike most other areas of the central nervous system (CNS), the retina utilizes both GABA and glycine inhibitory neurotransmitters to refine glutamatergic excitatory signals (Franke & Baden, 2017; Werblin, 2011; C. …

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Preference For Odor-Taste Mixtures Is Dependent On Previous Experience., Kelsey Allison Mcqueen May 2019

Preference For Odor-Taste Mixtures Is Dependent On Previous Experience., Kelsey Allison Mcqueen

Electronic Theses and Dissertations

The perception of flavors occurs when a tastant is simultaneously detected and associated with an odorant (i.e., odor-taste mixture). Sampling an odor and taste together results in a congruent odor-taste mixture. Mixing an odor and taste from different congruent odor-taste pairs results in incongruent odor-taste mixtures. Creation of a flavor percept requires sampling a novel chemosensory stimulus; however, mammals exhibit robust neophobic behavior when presented with new chemosensory stimuli. To determine preferences for novel odorants and experienced odor-taste mixtures, we employ a two-bottle brief-access preference task where two chemosensory stimuli are presented simultaneously. We found that rats show a preference …

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Neural Correlates Relating To Executive Function, Intelligence, And Anxiety., Sarah K L'Heureux Dec 2018

Neural Correlates Relating To Executive Function, Intelligence, And Anxiety., Sarah K L'Heureux

College of Arts & Sciences Senior Theses

The human brain is a complex organ responsible for not only perceiving and sensing information in one’s environment, but also integrating and analyzing these details in a way that will allow an individual to comprehend the material. Scientists for centuries have been curious as to why people process their emotions and thoughts differently, resulting in unique and varied behavior. The manner in which a person comprehends information and whether or not they feel anxious as a result, may be connected to their intellectual and functional capacity. Human intelligence and the ability to function at a high level may be related …

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Role Of Trkb-Signaling In Taste Development And Function., Jennifer Rios-Pilier Dec 2018

Role Of Trkb-Signaling In Taste Development And Function., Jennifer Rios-Pilier

Electronic Theses and Dissertations

In the geniculate ganglion, taste neurons likely differentiate into subtypes during development, but very little is known about how these neurons are defined molecularly or how they differentiate. Embryonically, geniculate neuron development is regulated by the growth factor, brain ­derived neurotrophic factor (BDNF). Postnatally, BDNF becomes restricted to subpopulations of taste receptor cells with specific functions, primarily sour responding. I hypothesized that during development, the receptor for BDNF, tropomyosin kinase B receptor (TrkB), also becomes restricted to a neuronal subset. I used transgenic mouse models to label and quantify both geniculate sensory neurons (Phox2b+), and those expressing TrkB (GFP) across …

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