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Articles 1 - 25 of 25
Full-Text Articles in Psychology
Effect Of Social Status On Behavioral And Neural Response To Stress, Daniel W. Curry, Kathleen E. Morrison, Matthew A. Cooper
Effect Of Social Status On Behavioral And Neural Response To Stress, Daniel W. Curry, Kathleen E. Morrison, Matthew A. Cooper
Chancellor’s Honors Program Projects
No abstract provided.
Mental Blocks: The Behavioural Effects And Neural Encoding Of Obstacles When Reaching And Grasping, Craig S. Chapman
Mental Blocks: The Behavioural Effects And Neural Encoding Of Obstacles When Reaching And Grasping, Craig S. Chapman
Electronic Thesis and Dissertation Repository
The ability to adeptly interact with a cluttered and dynamic world requires that the brain simultaneously encode multiple objects. Theoretical frameworks of selective visuomotor attention provide evidence for parallel encoding (Baldauf & Deubel, 2010; Cisek & Kalaska, 2010; Duncan, 2006) where concurrent object processing results in neural competition. Since the end goal of object representation is usually action, these frameworks argue that the competitive activity is best characterized as the development of visuomotor biases. While some behavioural and neural evidence has been accumulated in favour of this explanation, one of the most striking, yet deceptively common, demonstrations of this capacity …
When Bad Stress Goes Good: Increased Threat Reactivity Predicts Improved Category Learning Performance, Shawn W. Ell, Brandon Cosley, Shannon L. Mccoy
When Bad Stress Goes Good: Increased Threat Reactivity Predicts Improved Category Learning Performance, Shawn W. Ell, Brandon Cosley, Shannon L. Mccoy
Psychology Faculty Scholarship
The way in which we respond to everyday stressors can have a profound impact on cognitive functioning. Maladaptive stress responses in particular are generally associated with impaired cognitive performance. We argue, however, that the cognitive system mediating task performance is also a critical determinant of the stress-cognition relationship. Consistent with this prediction, we observed that stress reactivity consistent with a maladaptive, threat response differentially predicted performance on two categorization tasks. Increased threat reactivity predicted enhanced performance on an information-integration task (i.e., learning is thought to depend upon a procedural-based memory system), and a (nonsignificant) trend for impaired performance on a …
Effect Of Social Status On Behavioral And Neural Response To Stress, Daniel W. Curry, Kathleen E. Morrison, Matthew A. Cooper
Effect Of Social Status On Behavioral And Neural Response To Stress, Daniel W. Curry, Kathleen E. Morrison, Matthew A. Cooper
Senior Thesis Projects, 2009
Individuals respond differently to traumatic stress. Social status, which plays a key role in how animals experience and interact with their social environment, may influence how individuals respond to stressors. In this study, we used a conditioned defeat model to investigate whether social status alters susceptibility to the behavioral and neural consequences of traumatic stress. Conditioned defeat is a model in Syrian hamsters in which an acute social defeat encounter results in a long term increase in submissive behavior and a loss of normal territorial aggression. To establish social status, we weight matched and paired Syrian hamsters in daily aggressive …
Alternation Rate In Perceptual Bistability Is Maximal At And Symmetric Around Equi-Dominance, Rubén Moreno-Bote, Asya Shpiro, John Rinzel, Nava Rubin
Alternation Rate In Perceptual Bistability Is Maximal At And Symmetric Around Equi-Dominance, Rubén Moreno-Bote, Asya Shpiro, John Rinzel, Nava Rubin
Publications and Research
When an ambiguous stimulus is viewed for a prolonged time, perception alternates between the different possible interpretations of the stimulus. The alternations seem haphazard, but closer inspection of their dynamics reveals systematic properties in many bistable phenomena. Parametric manipulations result in gradual changes in the fraction of time a given interpretation dominates perception, often over the entire possible range of zero to one. The mean dominance durations of the competing interpretations can also vary over wide ranges (from less than a second to dozens of seconds or more), but finding systematic relations in how they vary has proven difficult. Following …
Neuropsychological And Emotion Processing Abnormalities In Bipolar Disorder I And Ii, Carol Randall
Neuropsychological And Emotion Processing Abnormalities In Bipolar Disorder I And Ii, Carol Randall
UNLV Theses, Dissertations, Professional Papers, and Capstones
Bipolar disorder illness is marked by emotional lability and mood disturbance, as well as various neuropsychological deficits, and the neuroanatomical correlates of many of these deficits are beginning to be identified. Numerous studies have implicated specific cortical and sub-cortical abnormalities in areas associated with executive function, memory, motor function, and the processing of emotion. Although a large body of research has been devoted to the investigation of cognitive and emotion-processing deficits in bipolar disorder, relatively few studies have been devoted to the investigation of how these deficits differ among bipolar disorder subtypes. This is surprising in light of known symptomatological …
Rule-Based Categorization Deficits In Focal Basal Ganglia Lesion And Parkinson’S Disease Patients, Shawn W. Ell, Andrea Weinstein, Richard Ivry
Rule-Based Categorization Deficits In Focal Basal Ganglia Lesion And Parkinson’S Disease Patients, Shawn W. Ell, Andrea Weinstein, Richard Ivry
Psychology Faculty Scholarship
Patients with basal ganglia (BG) pathology are consistently found to be impaired on rule-based category learning tasks in which learning is thought to depend upon the use of an explicit, hypothesis-guided strategy. The factors that influence this impairment remain unclear. Moreover, it remains unknown if the impairments observed in patients with degenerative disorders such as Parkinson’s disease (PD) are also observed in those with focal BG lesions. In the present study, we tested patients with either focal BG lesions or PD on two categorization tasks that varied in terms of their demands on selective attention and working memory. Individuals with …
A Longitudinal Study Of Neurocognitive Deficits And Functional Outcome In Bipolar Disorder, Brian D. Leany
A Longitudinal Study Of Neurocognitive Deficits And Functional Outcome In Bipolar Disorder, Brian D. Leany
UNLV Theses, Dissertations, Professional Papers, and Capstones
Bipolar disorder is an affective disorder that, in addition to being characterized by depressive and expansive mood symptoms, often presents with neuropsychological deficits. Bipolar disorder not only impairs an individual’s cognitive abilities, but these cognitive impairments may also impact day-to-day activities causing functional impairment. In other psychiatric disorders such as schizophrenia, it has been shown that the neuropsychological deficits are predictive of poor, long term treatment outcome and functioning. However, while bipolar disorder affects nearly 1 - 2% of the U.S. population (Keck, McElroy, & Arnold, 2001), little is known about the extent that neurocognitive deficits may play in the …
The Effects Of Handedness And Bilateral Saccadic Eye Movements On False Alarms In Recognition Memory, Lisa Weinberg
The Effects Of Handedness And Bilateral Saccadic Eye Movements On False Alarms In Recognition Memory, Lisa Weinberg
Psychology Honors Projects
Handedness can be used as a marker for interhemispheric interaction, which can produce memory benefits. Bilateral saccadic eye movements can be used to manipulate levels of interhemispheric interaction. This study measured the effects of handedness and bilateral saccadic eye movement on memory using the Deese-Roediger-McDermott paradigm. This study predicted a memory advantage for left-handers and mixed-handers without eye movements and an advantage for right-handers with the eye movements. The results do not support these predictions but do suggest that handedness is a factor in episodic memory performance. The analyses for this study were run using A’ to compare false alarm …
Group Ii Metabolic Glutamate Receptors In The Basal Amygdala Regulate Sleep And Fear-Induced Alterations In Sleep, Enheng Dong
Group Ii Metabolic Glutamate Receptors In The Basal Amygdala Regulate Sleep And Fear-Induced Alterations In Sleep, Enheng Dong
Theses and Dissertations in Biomedical Sciences
Glutamate is a major excitatory neurotransmitter in the brain and it has been recognized as playing an essential role in activating and maintaining arousal. Group II metabotropic glutamate (mGlu II) receptors are expressed in the amygdala, a brain structure important in the regulation of stress and anxiety as well as in the regulation of sleep and arousal. Our lab has found that the central nucleus of the amygdala (CNA) is involved in the emotional modulation of sleep. The basal amygdala (BA), which has direct connections with the CNA, is involved in conditioned fear and fear extinction. However, the potential role …
Locus Of Control And The Age Difference In Free Recall From Episodic Memory, Paul Amrhein, Judith K. Bond, Derek Hamilton
Locus Of Control And The Age Difference In Free Recall From Episodic Memory, Paul Amrhein, Judith K. Bond, Derek Hamilton
Department of Psychology Faculty Scholarship and Creative Works
The authors investigated the relation of locus of control (LOC) to age differences in free-recall memory performance. Older and younger participants completed P. C. Duttweiler's (1984) Internal Control Index (ICI) and subsequently performed free-recall memory tasks. Compared with the younger participants, the older participants exhibited poorer recall with more intrusions and uncorrected repetition errors as well as reduced categorical clustering. For the older participants with less internal LOC, recall proportion and item-pair associative recall clustering were lower than for the older participants with more internal LOC. By contrast, the younger participants did not exhibit any LOC effects in their recall …
Seasonal Hippocampal Plasticity In Food-Storing Birds., David F Sherry, Jennifer S Hoshooley
Seasonal Hippocampal Plasticity In Food-Storing Birds., David F Sherry, Jennifer S Hoshooley
Psychology Publications
Both food-storing behaviour and the hippocampus change annually in food-storing birds. Food storing increases substantially in autumn and winter in chickadees and tits, jays and nutcrackers and nuthatches. The total size of the chickadee hippocampus increases in autumn and winter as does the rate of hippocampal neurogenesis. The hippocampus is necessary for accurate cache retrieval in food-storing birds and is much larger in food-storing birds than in non-storing passerines. It therefore seems probable that seasonal change in caching and seasonal change in the hippocampus are causally related. The peak in recruitment of new neurons into the hippocampus occurs before birds …
Effects Of Chlordiazepoxide On Predator Odor-Induced Reductions Of Playfulness In Juvenile Rats, Stephen M. Siviy, Courtney L. Steets, Lauren M. Debrouse
Effects Of Chlordiazepoxide On Predator Odor-Induced Reductions Of Playfulness In Juvenile Rats, Stephen M. Siviy, Courtney L. Steets, Lauren M. Debrouse
Psychology Faculty Publications
The extent to which a non-sedative dose of chlordiazepoxide (CDP) is able to modify the behavioral responses toward a predator odor was assessed in juvenile rats. Play behavior was suppressed and defensive behaviors were enhanced in the presence of a collar previously worn by a cat, when tested 24 hours later in the same context as that where the exposure occurred, and when tested in a context different than that in which the exposure occurred for up to 3 hours after exposure. CDP had no effect on the ability of cat odor to suppress play when rats were tested in …
The Biology Of Reality Testing - Implications For Cognitive Education, Neil Greenberg
The Biology Of Reality Testing - Implications For Cognitive Education, Neil Greenberg
Neil Greenberg
• This report explores the proposition that teaching effectiveness can be enhanced by accommodating the key differences between two complementary and deeply engrained modes of reality testing, each predominantly centered in different hemispheres of the brain. • (1) Correspondence involves “reality-testing” of a percept, the cerebral representation of an experience in the world. • (2) Coherence involves “textualizing”, that is, reality-testing of a percept by how easily it relates to previous and ongoing parallel and collateral experiences. • Confidence in the validity of any percept throughout development is related to the interplay of these key processes. • As organisms develop, …
"The Chills" As A Psychological Response: Affective Composition, Trait Antecedents, And Factor Structure, Laura Anne Maruskin
"The Chills" As A Psychological Response: Affective Composition, Trait Antecedents, And Factor Structure, Laura Anne Maruskin
Dissertations, Theses, and Masters Projects
No abstract provided.
Virtual Environments And Sensory Integration: Effects Of Aging And Stroke, Nicoleta L. Bugnariu, Joyce Fung
Virtual Environments And Sensory Integration: Effects Of Aging And Stroke, Nicoleta L. Bugnariu, Joyce Fung
All Faculty Scholarship
Research was carried out on the effects of aging and sensory motor defi cits following strokes with respect to the capacity of the central nervous system to resolve sensory confl icts created by Virtual Reality (VR). The results of this research demonstrate that VR can be a valuable tool for therapeutic interventions that require an adaptation to complex, multimodal environments. The rehabilitation protocols include balancing training in virtual environments.
Les études qui ont été menées sur les effets du vieillissement et des défi cits sensori-moteurs consé-cutivement aux accidents vasculaires cérébraux concernent la capacité du système nerveux cen-tral à résoudre les …
Comparison Of Affective Analgesia And Conditioned Place Preference Following Cholinergic Activation Of, Elena Schifirnet
Comparison Of Affective Analgesia And Conditioned Place Preference Following Cholinergic Activation Of, Elena Schifirnet
Wayne State University Dissertations
Activation of the dopaminergic mesolimbic reward circuitry that originates in the ventral tegmental area (VTA) is postulated to preferentially suppress affective reactions to noxious stimuli (affective analgesia, AA). VTA dopamine neurons are activated via cholinergic inputs, and we have observed that microinjections of the acetylcholine agonist carbachol suppressed vocalizations of rats that occur following administration of brief (1 sec) tail-shocks (vocalization afterdischarges = VAD). VADs are a validated rodent model of pain affect. In addition, the capacity of carbachol to support reinforcement appears to be regionally dependent within VTA. Ikemoto and Wise (2002) reported that carbachol was self-administered in the …
Play And Adversity: How The Playful Mammalian Brain Withstands Threats And Anxieties, Stephen M. Siviy
Play And Adversity: How The Playful Mammalian Brain Withstands Threats And Anxieties, Stephen M. Siviy
Psychology Faculty Publications
Most mammals play, but they do so in a dangerous world. The dynamic relationship between the stresses created by their world and the activity of play helps to explain the evolution of play in mammals, as the author demonstrates in evidence garnered from experiments that introduce elements of fear to rats at play. The author describes the resulting fearful behavior and quantifies the fluctuation in play that results, and then he investigates how these are modified by increased maternal care or the use of benzodiazepines. In conclusion, he discusses how such research can help shed light on the neurobiology underlying …
Possible Regulatory Effects Of Coalition Computations On The Mu Rhythm, Kyle Timothy Gagnon
Possible Regulatory Effects Of Coalition Computations On The Mu Rhythm, Kyle Timothy Gagnon
Dissertations, Theses, and Masters Projects
No abstract provided.
The Biology Of Reality Testing - Implications For Cognitive Education, Neil Greenberg
The Biology Of Reality Testing - Implications For Cognitive Education, Neil Greenberg
Faculty Publications and Other Works -- Ecology and Evolutionary Biology
• This report explores the proposition that teaching effectiveness can be enhanced by accommodating the key differences between two complementary and deeply engrained modes of reality testing, each predominantly centered in different hemispheres of the brain. • (1) Correspondence involves “reality-testing” of a percept, the cerebral representation of an experience in the world. • (2) Coherence involves “textualizing”, that is, reality-testing of a percept by how easily it relates to previous and ongoing parallel and collateral experiences. • Confidence in the validity of any percept throughout development is related to the interplay of these key processes. • As organisms develop, …
Amygdala And Dorsomedial Prefrontal Cortex Responses To Appearance-Based And Behavior-Based Person Impressions., Sean Baron, M Gobinni, Andrew Engell, Alex Todorov
Amygdala And Dorsomedial Prefrontal Cortex Responses To Appearance-Based And Behavior-Based Person Impressions., Sean Baron, M Gobinni, Andrew Engell, Alex Todorov
Andrew Engell
Distributed Representations Of Dynamic Facial Expressions In The Superior Temporal Sulcus., Chris Said, Chris Moore, Andrew Engell, Alex Todroov, James Haxby
Distributed Representations Of Dynamic Facial Expressions In The Superior Temporal Sulcus., Chris Said, Chris Moore, Andrew Engell, Alex Todroov, James Haxby
Andrew Engell
Influence Of Perinatal Exposure To A Polychlorinated Biphenyl Mixture On Learning And Memory, Hippocampal Size, And Estrogen Receptor-Beta Expression, Howard Cromwell
Influence Of Perinatal Exposure To A Polychlorinated Biphenyl Mixture On Learning And Memory, Hippocampal Size, And Estrogen Receptor-Beta Expression, Howard Cromwell
Howard Casey Cromwell
Abstract. Perinatal exposure to PCB has been reported to cause a variety of health effects including endocrine disruption, and immunologic, reproductive, neurologic, and behavioral deficits. In the present study, a mixture of two PCB congeners, one non-coplanar (PCB 47) and one coplanar (PCB 77), were administered to young female Sprague-Dawley rats by route of maternal dietary consumption (either 12.5 ppm or 25.0 ppm, w/w). Impact on learning and memory were examined by radial arm maze on postnatal day 24-27. After behavioral tests were completed, the rats were transcardially perfused, and brains were excised. Immunohistochemistry for ER- β was carried out …
Cortical Underconnectivity Coupled With Preserved Visuospatial Cognition In Autism: Evidence From An Fmri Study Of An Embedded Figures Task, Saudamini Damarla, Timothy A. Keller, Rajesh K. Kana, Vladimir L. Cherkassky, Diane L. Williams, Nancy J. Minshew, Marcel Adam Just
Cortical Underconnectivity Coupled With Preserved Visuospatial Cognition In Autism: Evidence From An Fmri Study Of An Embedded Figures Task, Saudamini Damarla, Timothy A. Keller, Rajesh K. Kana, Vladimir L. Cherkassky, Diane L. Williams, Nancy J. Minshew, Marcel Adam Just
Marcel Adam Just
No abstract provided.
A Neurosemantic Theory Of Concrete Noun Representation Based On The Underlying Brain Codes, Marcel Adam Just, Vladimir L. Cherkassky, Sandesh Aryal, Tom M. Mitchell
A Neurosemantic Theory Of Concrete Noun Representation Based On The Underlying Brain Codes, Marcel Adam Just, Vladimir L. Cherkassky, Sandesh Aryal, Tom M. Mitchell
Marcel Adam Just
No abstract provided.