keyword
MENU ▼
Read by QxMD icon Read
search

Valerie Voon

keyword
https://www.readbyqxmd.com/read/28229895/impulse-control-disorders-and-levodopa-induced-dyskinesias-in-parkinson-s-disease-an-update
#1
REVIEW
Valerie Voon, T Celeste Napier, Michael J Frank, Veronique Sgambato-Faure, Anthony A Grace, Maria Rodriguez-Oroz, Jose Obeso, Erwan Bezard, Pierre-Olivier Fernagut
Dopaminergic medications used in the treatment of patients with Parkinson's disease are associated with motor and non-motor behavioural side-effects, such as dyskinesias and impulse control disorders also known as behavioural addictions. Levodopa-induced dyskinesias occur in up to 80% of patients with Parkinson's after a few years of chronic treatment. Impulse control disorders, including gambling disorder, binge eating disorder, compulsive sexual behaviour, and compulsive shopping occur in about 17% of patients with Parkinson's disease on dopamine agonists...
March 2017: Lancet Neurology
https://www.readbyqxmd.com/read/28121259/neurobiology-of-the-premonitory-urge-in-tourette-s-syndrome-pathophysiology-and-treatment-implications
#2
Andrea E Cavanna, Kevin J Black, Mark Hallett, Valerie Voon
Motor and vocal tics are relatively common motor manifestations identified as the core features of Tourette's syndrome (TS). Although traditional descriptions have focused on objective phenomenological observations, such as anatomical location, number and frequency of tics, patients' first-person accounts have consistently reported characteristic subjective correlates. These sensory phenomena are often described as a feeling of mounting inner tension or urge to move ("premonitory urge"), which is transiently relieved by tic expression...
January 25, 2017: Journal of Neuropsychiatry and Clinical Neurosciences
https://www.readbyqxmd.com/read/28105707/binge-drinking-differentially-affects-cortical-and-subcortical-microstructure
#3
Laurel S Morris, Nicholas G Dowell, Mara Cercignani, Neil A Harrison, Valerie Voon
Young adult binge drinkers represent a model for endophenotypic risk factors for alcohol misuse and early exposure to repeated binge cycles. Chronic or harmful alcohol use leads to neurochemical, structural and morphological neuroplastic changes, particularly in regions associated with reward processing and motivation. We investigated neural microstructure in 28 binge drinkers compared with 38 matched healthy controls. We used a recently developed diffusion magnetic resonance imaging acquisition and analysis, which uses three-compartment modelling (of intracellular, extracellular and cerebrospinal fluid) to determine brain tissue microstructure features including neurite density and orientation dispersion index (ODI)...
January 20, 2017: Addiction Biology
https://www.readbyqxmd.com/read/28103527/distinct-cortico-striatal-connections-with-subthalamic-nucleus-underlie-facets-of-compulsivity
#4
Laurel S Morris, Kwangyeol Baek, Valerie Voon
The capacity to flexibly respond to contextual changes is crucial to adapting to a dynamic environment. Compulsivity, or behavioural inflexibility, consists of heterogeneous subtypes with overlapping yet discrete neural substrates. The subthalamic nucleus (STN) mediates the switch from automatic to controlled processing to slow, break or stop behaviour when necessary. Rodent STN lesions or inactivation are linked with perseveration or repetitive, compulsive responding. However, there are few studies examining the role of latent STN-centric neural networks and compulsive behaviour in healthy individuals...
December 29, 2016: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28040671/decisional-impulsivity-and-the-associative-limbic-subthalamic-nucleus-in-obsessive-compulsive-disorder-stimulation-and-connectivity
#5
Valerie Voon, Fabien Droux, Laurel Morris, Stephan Chabardes, Thierry Bougerol, Olivier David, Paul Krack, Mircea Polosan
Why do we make hasty decisions for short-term gain? Rapid decision-making with limited accumulation of evidence and delay discounting are forms of decisional impulsivity. The subthalamic nucleus is implicated in inhibitory function but its role in decisional impulsivity is less well-understood. Here we assess decisional impulsivity in subjects with obsessive compulsive disorder who have undergone deep brain stimulation of the limbic and associative subthalamic nucleus. We show that stimulation of the subthalamic nucleus is causally implicated in increasing decisional impulsivity with less accumulation of evidence during probabilistic uncertainty and in enhancing delay discounting...
February 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/27882998/dopamine-and-opioid-neurotransmission-in-behavioral-addictions-a-comparative-pet-study-in-pathological-gambling-and-binge-eating
#6
Joonas Majuri, Juho Joutsa, Jarkko Johansson, Valerie Voon, Kati Alakurtti, Riitta Parkkola, Tuuli Lahti, Hannu Alho, Jussi Hirvonen, Eveliina Arponen, Sarita Forsback, Valtteri Kaasinen
Although behavioral addictions share many clinical features with drug addictions, they show strikingly large variation in their behavioral phenotypes (such as in uncontrollable gambling or eating). Neurotransmitter function in behavioral addictions is poorly understood, but has important implications in understanding its relationship with substance use disorders and underlying mechanisms of therapeutic efficacy. Here, we compare opioid and dopamine function between two behavioral addiction phenotypes: pathological gambling (PG) and binge eating disorder (BED)...
December 14, 2016: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/27787929/compulsive-sexual-behavior-prefrontal-and-limbic-volume-and-interactions
#7
Casper Schmidt, Laurel S Morris, Timo L Kvamme, Paula Hall, Thaddeus Birchard, Valerie Voon
BACKGROUND: Compulsive sexual behaviors (CSB) are relatively common and associated with significant personal and social dysfunction. The underlying neurobiology is still poorly understood. The present study examines brain volumes and resting state functional connectivity in CSB compared with matched healthy volunteers (HV). METHODS: Structural MRI (MPRAGE) data were collected in 92 subjects (23 CSB males and 69 age-matched male HV) and analyzed using voxel-based morphometry...
October 27, 2016: Human Brain Mapping
https://www.readbyqxmd.com/read/27769568/specific-frontostriatal-circuits-for-impaired-cognitive-flexibility-and-goal-directed-planning-in-obsessive-compulsive-disorder-evidence-from-resting-state-functional-connectivity
#8
Matilde M Vaghi, Petra E Vértes, Manfred G Kitzbichler, Annemieke M Apergis-Schoute, Febe E van der Flier, Naomi A Fineberg, Akeem Sule, Rashid Zaman, Valerie Voon, Prantik Kundu, Edward T Bullmore, Trevor W Robbins
BACKGROUND: A recent hypothesis has suggested that core deficits in goal-directed behavior in obsessive-compulsive disorder (OCD) are caused by impaired frontostriatal function. We tested this hypothesis in OCD patients and control subjects by relating measures of goal-directed planning and cognitive flexibility to underlying resting-state functional connectivity. METHODS: Multiecho resting-state acquisition, combined with micromovement correction by blood oxygen level-dependent sensitive independent component analysis, was used to obtain in vivo measures of functional connectivity in 44 OCD patients and 43 healthy comparison subjects...
August 11, 2016: Biological Psychiatry
https://www.readbyqxmd.com/read/27536223/compulsivity-across-the-pathological-misuse-of-drug-and-non-drug-rewards
#9
Paula Banca, Neil A Harrison, Valerie Voon
Behavioral adaptation is required for the successful navigation of a constantly changing environment. Impairments in behavioral flexibility are commonly observed in psychiatric disorders including those of addiction. This study investigates two distinct facets of compulsivity, namely reversal learning and attentional set shifting, implicating orbitofrontal and lateral prefrontal regions respectively, across disorders of primary and secondary rewards. Obese subjects with and without binge eating disorder (BED), individuals with compulsive sexual behaviors (CSB), alcohol dependence (AD) and pathological video-gaming (VG) were tested with two computerized tasks: the probabilistic reversal task (trials to criterion and win-stay/lose-shift errors) and the intra/extra-dimensional set shift task (IED)...
2016: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/27470127/searching-for-clarity-in-muddy-water-future-considerations-for-classifying-compulsive-sexual-behavior-as-an-addiction
#10
Shane W Kraus, Valerie Voon, Ariel Kor, Marc N Potenza
No abstract text is available yet for this article.
July 28, 2016: Addiction
https://www.readbyqxmd.com/read/27427940/the-role-of-social-novelty-in-risk-seeking-and-exploratory-behavior-implications-for-addictions
#11
Simon Mitchell, Jennifer Gao, Mark Hallett, Valerie Voon
Novelty preference or sensation seeking is associated with disorders of addiction and predicts rodent compulsive drug use and adolescent binge drinking in humans. Novelty has also been shown to influence choice in the context of uncertainty and reward processing. Here we introduce a novel or familiar neutral face stimuli and investigate its influence on risk-taking choices in healthy volunteers. We focus on behavioural outcomes and imaging correlates to the prime that might predict risk seeking. We hypothesized that subjects would be more risk seeking following a novel relative to familiar stimulus...
2016: PloS One
https://www.readbyqxmd.com/read/27418067/translatable-and-back-translatable-measurement-of-impulsivity-and-compulsivity-convergent-and-divergent-processes
#12
REVIEW
Valerie Voon, Jeffrey W Dalley
Impulsivity and compulsivity have emerged as important dimensional constructs that challenge traditional psychiatric classification systems. Both are present in normal healthy populations where the need to act quickly and repeatedly without hesitation can be highly advantageous. However, when excessively expressed, impulsive and compulsive behavior can lead to adverse consequences and spectrum disorders exemplified by attention-deficit/hyperactivity disorder (ADHD), obsessive compulsive disorder (OCD), autism, and drug addiction...
2016: Current Topics in Behavioral Neurosciences
https://www.readbyqxmd.com/read/27207916/dissociated-accumbens-and-hippocampal-structural-abnormalities-across-obesity-and-alcohol-dependence
#13
Tom B Mole, Elijah Mak, Yee Chien, Valerie Voon
BACKGROUND: Processing of food and drug rewards involves specific neurocircuitry, and emerging evidence implicates subcortical abnormalities, particularly the nucleus accumbens and hippocampus. We specifically hypothesized that these 2 established regions in addiction neurocircuitry are associated with distinctive in vivo structural abnormalities in obesity and alcohol dependence. METHODS: To specifically investigate anatomically discrete volumetric changes associated with overconsumption of different rewards, we acquired T1 MRI data from 118 subjects in 3 groups comprising obesity (n=42), alcohol dependence (n=32), and healthy volunteer controls (n=44)...
September 2016: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/27109924/preliminary-evidence-for-human-globus-pallidus-pars-interna-neurons-signaling-reward-and-sensory-stimuli
#14
Nicholas A Howell, Ian A Prescott, Andres M Lozano, Mojgan Hodaie, Valerie Voon, William D Hutchison
The globus pallidus pars interna (GPi) is a component of the basal ganglia, a network of subcortical nuclei that process motor, associative, and limbic information. While non-human primate studies have suggested a role for the GPi in non-motor functions, there have been no single-unit studies of non-motor electrophysiological behavior of human GPi neurons. We therefore sought to extend these findings by collecting single-unit recordings from awake patients during functional stereotactic neurosurgery targeting the GPi for deep brain stimulation...
July 22, 2016: Neuroscience
https://www.readbyqxmd.com/read/26963083/illusion-of-agency-in-patients-with-gilles-de-la-tourette-syndrome
#15
Cécile Delorme, Alexandre Salvador, Valerie Voon, Emmanuel Roze, Marie Vidailhet, Andreas Hartmann, Yulia Worbe
The sense of agency refers to the conscious experience of authorship and control over actions. The voluntary or involuntary nature of tics, which are the hallmark of Gilles de la Tourette Syndrome (GTS), is unclear. Here, we studied metacognitive processing of agency in an explicit agency task on non-medicated and medicated GTS patients compared to matched controls. In this task, the participants made judgements of control and performance after completion of a computerized game where they had to catch targets with a cursor by moving the computer mouse...
April 2016: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/26941628/emoticom-a-neuropsychological-test-battery-to-evaluate-emotion-motivation-impulsivity-and-social-cognition
#16
Amy R Bland, Jonathan P Roiser, Mitul A Mehta, Thea Schei, Heather Boland, Daniel K Campbell-Meiklejohn, Richard A Emsley, Marcus R Munafo, Ian S Penton-Voak, Ana Seara-Cardoso, Essi Viding, Valerie Voon, Barbara J Sahakian, Trevor W Robbins, Rebecca Elliott
In mental health practice, both pharmacological and non-pharmacological treatments are aimed at improving neuropsychological symptoms, including cognitive and emotional impairments. However, at present there is no established neuropsychological test battery that comprehensively covers multiple affective domains relevant in a range of disorders. Our objective was to generate a standardized test battery, comprised of existing, adapted and novel tasks, to assess four core domains of affective cognition (emotion processing, motivation, impulsivity and social cognition) in order to facilitate and enhance treatment development and evaluation in a broad range of neuropsychiatric disorders...
2016: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/26900733/functional-neuroanatomy-and-neurophysiology-of-functional-neurological-disorders-conversion-disorder
#17
Valerie Voon, Andrea E Cavanna, Kerry Coburn, Shirlene Sampson, Alya Reeve, W Curt LaFrance
Much is known regarding the physical characteristics, comorbid symptoms, psychological makeup, and neuropsychological performance of patients with functional neurological disorders (FNDs)/conversion disorders. Gross neurostructural deficits do not account for the patients' deficits or symptoms. This review describes the literature focusing on potential neurobiological (i.e. functional neuroanatomic/neurophysiological) findings among individuals with FND, examining neuroimaging and neurophysiological studies of patients with the various forms of motor and sensory FND...
2016: Journal of Neuropsychiatry and Clinical Neurosciences
https://www.readbyqxmd.com/read/26900571/sexually-dimorphic-brain-volume-interaction-in-college-aged-binge-drinkers
#18
Timo L Kvamme, Casper Schmidt, Daniela Strelchuk, Yee Chien Chang-Webb, Kwangyeol Baek, Valerie Voon
BACKGROUND: Binge consumption of alcohol is a major societal problem associated with important cognitive, physiological and neurotoxic consequences. Converging evidence highlights the need to assess binge drinking (BD) and its effects on the developing brain while taking into account gender differences. Here, we compared the brain volumetric differences between genders in college-aged binge drinkers and healthy volunteers. METHOD: T1-weighted magnetic resonance imaging (MRI) images of 30 binge drinkers (18 males) and 46 matched healthy volunteers (23 males) were examined using voxel-based morphometry...
2016: NeuroImage: Clinical
https://www.readbyqxmd.com/read/26893127/should-compulsive-sexual-behavior-be-considered-an-addiction
#19
Shane W Kraus, Valerie Voon, Marc N Potenza
AIMS: To review the evidence base for classifying compulsive sexual behavior (CSB) as a non-substance or 'behavioral' addiction. METHODS: Data from multiple domains (e.g. epidemiological, phenomenological, clinical, biological) are reviewed and considered with respect to data from substance and gambling addictions. RESULTS: Overlapping features exist between CSB and substance use disorders. Common neurotransmitter systems may contribute to CSB and substance use disorders, and recent neuroimaging studies highlight similarities relating to craving and attentional biases...
December 2016: Addiction
https://www.readbyqxmd.com/read/26792099/deficits-in-limb-praxis-in-patients-with-obsessive-compulsive-disorder
#20
Elisabeth Rounis, Paula Banca, Valerie Voon
There is recent evidence of deficits in praxis in patients with primary dystonia. Obsessive-compulsive disorder (OCD) has been linked to disorders of higher-order motor function, such as dystonia. However, no clear mechanism underlying such a relationship has been found. This pilot study aimed to identify whether patients with OCD might also show deficits in praxis. Patients with OCD were compared with healthy volunteers on a meaningless gesture imitation task. Patients showed significantly lower scores in this task...
2016: Journal of Neuropsychiatry and Clinical Neurosciences
keyword
keyword
117957
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"