Neuroscience and Neurobiology Commons^™

Concentration Coding In The Accessory Olfactory System, Hannah Ada Arnson

All Theses and Dissertations (ETDs)

Understanding how sensory systems encode stimuli is a fundamental question of neuroscience. The role of every sensory system is to encode information about the identity and quantity of stimuli in the environment. Primary sensory neurons in the periphery are faced with the task of representing all relevant information for further processing by downstream circuits, ultimately leading to detection, classification and potential response. However, environmental variability potentially alters stimulus properties in non-relevant ways. Here, we address these problems using the mouse accessory olfactory system: AOS) as a model. The AOS is an independent olfactory system possessed by most terrestrial vertebrates, although …

Research Brief: "Cognitive Behavioral Treatment For Post-Traumatic Nightmares: An Investigation Of Predictors Of Dropout And Outcome", Institute For Veterans And Military Families At Syracuse University

Institute for Veterans and Military Families

This brief is about the cognitive behavior treatment outcomes and drop outs of Vietnam veterans with PTSD who experience nightmares. In policy and practice, various socialization strategies should be implemented by clinics based on veterans' levels of traumatic history, and veterans' families should work to create a positive view of therapy; policymakers should provide support for these therapies and the training of clinicians to provide them. Suggestions for future research include having a more generalizable population in the study, examining the impact of the study's exclusion criteria, and the impact of psychotropic medicines on treatment outcome.

Precise Lamination Of Retinal Axons Generates Multiple Parallel Input Pathways In The Tectum, Estuardo Robles, Alessandro Filosa, Herwig Baier

Neuroscience: Faculty Publications

The axons of retinal ganglion cells (RGCs) form topographic connections in the optic tectum, recreating a two-dimensional map of the visual field in the midbrain. RGC axons are also targeted to specific positions along the laminar axis of the tectum. Understanding the sensory transformations performed by the tectum requires identification of the rules that control the formation of synaptic laminae by RGC axons. However, there is little information regarding the spatial relationships between multiple axons as they establish laminar and retinotopic arborization fields within the same region of neuropil. Moreover, the contribution of RGC axon lamination to the processing of …

Brainstorm: Violence, Videogames, And Learning To Say “I Don’T Know” – Part 2, John J. Medina Ph.D.

Brainstorm

This is the second (and final) installment in a series examining the effects of videogames on aggressive behavior in the people who play them.

We just finished looking at a study suggesting that violent videogames represent a deep, causal risk factor for inciting violent behavior in kids — a loving parent’s worst nightmare. We are about to look at a second article, published right after the first, which says exactly the opposite.

Analyzing Reading Specialization Using Fmri, Rs-Fcmri, And Development, Alecia Cristen Vogel-Hammen

All Theses and Dissertations (ETDs)

Reading is an important, phylogenetically new skill. While neuroimaging studies have identified brain regions used in reading, it is unclear to what extent these regions become specialized for use predominantly in reading versus other tasks. The goal of this dissertation is to investigate the extent to which reading specialization exists at the region and network level, with a focus on orthography, the visual processing of words and letters.

I used task-based and resting state functional connectivity: rs-fcMRI) studies to investigate the specialization of orthographic processing, purportedly localized to a left occipito-temporal fusiform cortex region. In Chapter 2, we find no …

Monocytic Cells Mediate Granulocyte-Colony Stimulating Factor-Induced Mobilization Of Hematopoietic Stem And Progenitor Cells, Mahil Rao

All Theses and Dissertations (ETDs)

In the normal, healthy adult, hematopoiesis occurs primarily in the bone marrow. As such, at steady state, a majority of hematopoietic stem and progenitor cells: HSPCs) are tightly held within specialized areas of the bone marrow collectively referred to as the `hematopoietic stem cell niche.' In response to various forms of stress, such as infection or hemorrhage, or following administration of a variety of pharmacologic agents, niche function is altered and HSPCs are released into the peripheral circulation through a process known as mobilization. Granulocyte-colony stimulating factor: G-CSF), a hematopoietic growth factor, is the most widely-used mobilizing agent clinically. However, …

Locus Coeruleus And Hippocampal Tyrosine Hydroxylase Levels In A Pressure-Overload Model Of Heart Disease, Luke A. Johnson

Undergraduate Honors Theses

Studies have indicated that approximately 30% of people with heart disease experience major depressive disorder (MDD). Despite strong clinical evidence of a link between the two diseases, the neurobiological processes involved in the relationship are poorly understood. A growing number of studies are revealing similar neuroanatomical and neurochemical abnormalities resulting from both depression and heart disease. The locus coeruleus (LC) is a group of neurons in the pons that synthesize and release norepinephrine, and that is known to play a significant role in depression pathobiology. For example, there is evidence that tyrosine hydroxylase (TH) is elevated in the LC in …

The Triggering Receptor Expressed On Myeloid Cells 2: “Trem-Ming” The Inflammatory Component Associated With Alzheimer's Disease, Troy T. Rohn

Biology Faculty Publications and Presentations

Alzheimer's disease (AD) is an age-related neurodegenerative disorder characterized by a progressive loss of memory and cognitive skills. Although much attention has been devoted concerning the contribution of the microscopic lesions, senile plaques, and neurofibrillary tangles to the disease process, inflammation has long been suspected to play a major role in the etiology of AD. Recently, a novel variant in the gene encoding the triggering receptor expressed on myeloid cells 2 (TREM2) has been identified that has refocused the spotlight back onto inflammation as a major contributing factor in AD. Variants in TREM2 triple one's risk of developing late-onset AD. …

Cue-Induced Conditioned Activity Does Not Incubate But Is Mediated By The Basolateral Amygdala, Geoffrey W. Diehl, Jonathan M. Wachtel, Tracie A. Paine

Faculty & Staff Scholarship

Re-exposure to drug-associated cues causes significant drug craving in recovering addicts, which may precipitate relapse. In animal models of craving, drug-seeking responses for contingent delivery of drug-associated cues sensitizes or “incubates” across drug withdrawal. To date there is limited evidence supporting an incubation effect for behaviors mediated by non-contingent presentation of drug-associated cues. Here we used a model of cue-induced conditioned activity to determine if the conditioned locomotor response to a non-contingent presentation of a drug-associated cue sensitizes across drug withdrawal. In addition, because cue-induced drug-seeking responses are mediated by the rostral basolateral amygdala (BLA), we investigated whether this structure …

Unconscious Processing Of Unattended Features In Human Visual Cortex, Tatiana Aloi Emmanouil, Philip Burton, Tony Ro

Publications and Research

Unconscious processing has been convincingly demonstrated for task-relevant feature dimensions. However, it is possible that the visual system is capable of more complex unconscious operations, extracting visual features even when they are unattended and task irrelevant. In the current study, we addressed this question by measuring unconscious priming using a task in which human participants attended to a target object's shape while ignoring its color. We measured both behavioral priming effects and priming-related fMRI activations from primes that were unconsciously presented using metacontrast masking. The results showed faster RTs and decreases in fMRI activation only when the primes were identical …

Brainstorm: Violence, Videogames, And Learning To Say “I Don’T Know” – Part 1, John J. Medina Ph.D.

Brainstorm

Confirmation bias is a term I have been thinking a lot lately, especially as the familiar gun­control/ gun­freedom pugilists take their respective corners on the far sides of our televisions.

One particular subject has to do with the role violent videogames play — or do not play — in creating aggressive tendencies in the people who play them (particularly young males).

Implicitly Priming The Social Brain: Failure To Find Neural Effects, Katherine E. Powers, Todd F. Heatherton

Dartmouth Scholarship

Humans have a fundamental need for social relationships. Rejection from social groups is especially detrimental, rendering the ability to detect threats to social relationships and respond in adaptive ways critical. Indeed, previous research has shown that experiencing social rejection alters the processing of subsequent social cues in a variety of socially affiliative and avoidant ways. Because social perception and cognition occurs spontaneously and automatically, detecting threats to social relationships may occur without conscious awareness or control. Here, we investigated the automaticity of social threat detection by examining how implicit primes affect neural responses to social stimuli. However, despite using a …

Rats Acquire Stronger Preference For Flavors Consumed Towards The End Of A High-Fat Meal, Kevin P. Myers

Faculty Journal Articles

Rats learn to prefer flavors associated with postingestive effects of nutrients. The physiological signals underlying this postingestive reward are unknown. We have previously shown that rats readily learn to prefer a flavor that was consumed early in a multi-flavored meal when glucose is infused intragastrically (IG), suggesting rapid postingestive reward onset. The present experiments investigate the timing of postingestive fat reward, by providing distinctive flavors in the first and second halves of meals accompanied by IG fat infusion. Learning stronger preference for the earlier or later flavor would indicate when the rewarding postingestive effects are sensed. Rats consumed sweetened, calorically-dilute …

Brainstorm: Experiences Are Better Than Things, John J. Medina Ph.D.

Brainstorm

My friend wanted me to explain the following comment, and quickly, because it was making him feel guilty.

“You’ve got three months with this gift,” I had just told him. We were out Christmas shopping for our spouses, and he was contemplating the purchase of a set of kitchen knives for his wife. “Just a quarter’s worth of goodness. After that, any blessing goes away.”

Striatal Glutamate Release In L-Dopa-Induced Dyskinetic Animals, Nina Nevalainen, Martin Lundblad, Greg A. Gerhardt, Ingrid Strömberg

Neuroscience Faculty Publications

L-DOPA-induced dyskinesia is a common side effect developed after chronic treatment with 3,4-dihydroxyphenyl-l-alanine (l-DOPA) in Parkinson's disease. The biological mechanisms behind this side effect are not fully comprehended although involvement of dopaminergic, serotonergic, and glutamatergic systems has been suggested. The present study utilizes in vivo amperometry to investigate the impact from unilateral 6-hydroxydopamine lesions and l-DOPA (4 mg/kg, including benserazide 15 mg/kg) -induced dyskinetic behavior on striatal basal extracellular glutamate concentration and potassium-evoked glutamate release in urethane-anesthetized rats. Recordings were performed before and after local L-DOPA application in the striatum. In addition, effects from the 5-HT_1A receptor agonist (2R)-(+)-8-hydroxy-2-(di-n-propylamino)tetralin …

Brainstorm: How To Take A Multiple Choice Test, John J. Medina Ph.D.

Brainstorm

In this blog section, we are going to explore the science behind study habits. Most of these topics will concern myth busting, and we begin this segment with a whopper.

A Naturally-Occurring Histone Acetyltransferase Inhibitor Derived From Garcinia Indica Impairs Newly Acquired And Reactivated Fear Memories, Stephanie A. Maddox, Casey S. Watts, Valerie Doyere, Glenn E. Schafe

Publications and Research

The study of the cellular and molecular mechanisms underlying the consolidation and reconsolidation of traumatic fear memories has progressed rapidly in recent years, yet few compounds have emerged that are readily useful in a clinical setting for the treatment of anxiety disorders such as post-traumatic stress disorder (PTSD). Here, we use a combination of biochemical, behavioral, and neurophysiological methods to systematically investigate the ability of garcinol, a naturallyoccurring histone acetyltransferase (HAT) inhibitor derived from the rind of the fruit of the Kokum tree (Garcina indica), to disrupt the consolidation and reconsolidation of Pavlovian fear conditioning, a widely studied rodent model …

Lifelong Bilingualism Maintains Neural Efficiency For Cognitive Control In Aging, Brian T. Gold, Chobok Kim, Nathan F. Johnson, Richard J. Kryscio, Charles D. Smith

Neuroscience Faculty Publications

Recent behavioral data have shown that lifelong bilingualism can maintain youthful cognitive control abilities in aging. Here, we provide the first direct evidence of a neural basis for the bilingual cognitive control boost in aging. Two experiments were conducted, using a perceptual task-switching paradigm, including a total of 110 participants. In Experiment 1, older adult bilinguals showed better perceptual switching performance than their monolingual peers. In Experiment 2, younger and older adult monolinguals and bilinguals completed the same perceptual task-switching experiment while functional magnetic resonance imaging (fMRI) was performed. Typical age-related performance reductions and fMRI activation increases were observed. However, …

Rescuing Acetylcholinesterase From Nerve Agent Inhibition: Protein Dynamics Driven Drug Discovery, Aiyana M. Emigh, Brian Bennion

STAR Program Research Presentations

Severe morbidity and mortality consequences result from irreversible inhibition of human acetylcholinesterase by organophosphates (OPs). Oxime-based reactivators are currently the only available treatments but lack efficacy in the central nervous system (CNS) where the most damage occurs. Computational docking and molecular dynamics (MD) simulations reveal complex structural barriers that may reduce oxime efficacy. These results may guide future drug designs of more effective countermeasures.

Copper Signaling In The Mammalian Nervous System: Synaptic Effects, Eric D. Gaier, Betty A. Eipper, Richard E. Mains

UCHC Articles - Research

Copper (Cu) is an essential metal present at high levels in the CNS. Its role as a co-factor in mitochondrial ATP production and in other essential cuproenzymes is well defined. Menkes and Wilson’s diseases are severe neurodegenerative conditions that demonstrate the importance of Cu transport into the secretory pathway. Brain levels of Cu, which is almost entirely protein bound, exceed extracellular levels by more than a hundred-fold. Cu stored in the secretory pathway is released in a Ca²⁺-dependent manner and can transiently reach concentrations over 100 µM at synapses. The ability of low µM levels of Cu to …