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Imaging in Psychiatry

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https://www.readbyqxmd.com/read/28428048/multi-center-machine-learning-in-imaging-psychiatry-a-meta-model-approach
#1
Petr Dluhoš, Daniel Schwarz, Wiepke Cahn, Neeltje van Haren, René Kahn, Filip Španiel, Jiří Horáček, Tomáš Kašpárek, Hugo Schnack
One of the biggest problems in automated diagnosis of psychiatric disorders from medical images is the lack of sufficiently large samples for training. Sample size is especially important in the case of highly heterogeneous disorders such as schizophrenia, where machine learning models built on relatively low numbers of subjects may suffer from poor generalizability. Via multicenter studies and consortium initiatives researchers have tried to solve this problem by combining data sets from multiple sites. The necessary sharing of (raw) data is, however, often hindered by legal and ethical issues...
April 17, 2017: NeuroImage
https://www.readbyqxmd.com/read/28426908/clinically-useful-brain-imaging-for-neuropsychiatry-how-can-we-get-there
#2
REVIEW
Michael P Milham, R Cameron Craddock, Arno Klein
Despite decades of research, visions of transforming neuropsychiatry through the development of brain imaging-based "growth charts" or "lab tests" have remained out of reach. In recent years, there is renewed enthusiasm about the prospect of achieving clinically useful tools capable of aiding the diagnosis and management of neuropsychiatric disorders. The present work explores the basis for this enthusiasm. We assert that there is no single advance that currently has the potential to drive the field of clinical brain imaging forward...
April 20, 2017: Depression and Anxiety
https://www.readbyqxmd.com/read/28425185/the-influence-of-hippocampal-atrophy-on-the-cognitive-phenotype-of-dementia-with-lewy-bodies
#3
Greg J Elder, Karen Mactier, Sean J Colloby, Rosie Watson, Andrew M Blamire, John T O'Brien, John-Paul Taylor
OBJECTIVE: The level of hippocampal atrophy in dementia with Lewy bodies (DLB) is typically less than that observed in Alzheimer's disease (AD). However, it is not known how the cognitive phenotype of DLB is influenced by hippocampal atrophy or the atrophy of adjacent medial temporal lobe structures. METHODS: Dementia with Lewy bodies (n = 65), AD (n = 76) and control (n = 63) participants underwent 3T magnetic resonance imaging and cognitive Cambridge Cognitive Examination and Mini-Mental State Examination (CAMCOG and MMSE) assessments...
April 20, 2017: International Journal of Geriatric Psychiatry
https://www.readbyqxmd.com/read/28416813/brain-derived-neurotrophic-factor-val-66-met-genotype-and-ovarian-steroids-interactively-modulate-working-memory-related-hippocampal-function-in-women-a-multimodal-neuroimaging-study
#4
S-M Wei, E B Baller, P D Kohn, J S Kippenhan, B Kolachana, S J Soldin, D R Rubinow, P J Schmidt, K F Berman
Preclinical evidence suggests that the actions of ovarian steroid hormones and brain-derived neurotrophic factor (BDNF) are highly convergent on brain function. Studies in humanized mice document an interaction between estrus cycle-related changes in estradiol secretion and BDNF Val(66)Met genotype on measures of hippocampal function and anxiety-like behavior. We believe our multimodal imaging data provide the first demonstration in women that the effects of the BDNF Val/Met polymorphism on hippocampal function are selectively modulated by estradiol...
April 18, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28397841/ketamine-induced-reduction-in-mglur5-availability-is-associated-with-an-antidepressant-response-an-11-c-abp688-and-pet-imaging-study-in-depression
#5
I Esterlis, N DellaGioia, R H Pietrzak, D Matuskey, N Nabulsi, C G Abdallah, J Yang, C Pittenger, G Sanacora, J H Krystal, R V Parsey, R E Carson, C DeLorenzo
The mechanisms of action of the rapid antidepressant effects of ketamine, an N-methyl-D-aspartate glutamate receptor antagonist, have not been fully elucidated. This study examined the effects of ketamine on ligand binding to a metabotropic glutamatergic receptor (mGluR5) in individuals with major depressive disorder (MDD) and healthy controls. Thirteen healthy and 13 MDD nonsmokers participated in two [(11)C]ABP688 positron emission tomography (PET) scans on the same day-before and during intravenous ketamine administration-and a third scan 1 day later...
April 11, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28397836/efhd2-swiprosin-1-is-a-common-genetic-determinator-for-sensation-seeking-low-anxiety-and-alcohol-addiction
#6
D Mielenz, M Reichel, T Jia, E B Quinlan, T Stöckl, M Mettang, D Zilske, E Kirmizi-Alsan, P Schönberger, M Praetner, S E Huber, D Amato, M Schwarz, P Purohit, S Brachs, J Spranger, A Hess, C Büttner, A B Ekici, F Perez-Branguli, B Winner, V Rauschenberger, T Banaschewski, A L W Bokde, C Büchel, P J Conrod, S Desrivières, H Flor, V Frouin, J Gallinat, H Garavan, P Gowland, A Heinz, J-L Martinot, H Lemaitre, F Nees, T Paus, M N Smolka, A Schambony, T Bäuerle, V Eulenburg, C Alzheimer, A Lourdusamy, G Schumann, C P Müller
In many societies, the majority of adults regularly consume alcohol. However, only a small proportion develops alcohol addiction. Individuals at risk often show a high sensation-seeking/low-anxiety behavioural phenotype. Here we asked which role EF hand domain containing 2 (EFhd2; Swiprosin-1) plays in the control of alcohol addiction-associated behaviours. EFhd2 knockout (KO) mice drink more alcohol than controls and spontaneously escalate their consumption. This coincided with a sensation-seeking and low-anxiety phenotype...
April 11, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28387975/insular-and-cingulate-attenuation-during-decision-making-is-associated-with-future-transition-to-stimulant-use-disorder
#7
Jennifer L Stewart, Mamona Butt, April C May, Susan F Tapert, Martin P Paulus
AIMS: To understand processes placing individuals at risk for stimulant (amphetamine and cocaine) use disorder. DESIGN: Longitudinal study. SETTING: University of California, San Diego Department of Psychiatry, USA. PARTICIPANTS: Occasional stimulant users (OSU; n = 184) underwent a baseline clinical interview and a functional magnetic resonance imaging (fMRI) session. On the basis of a follow-up clinical interview completed three years later, OSU (n = 147) were then categorized as problem stimulant users (PSU: n = 36; those who developed stimulant use disorders in the interim) or desisted stimulant users (DSU: n = 74; those who stopped using)...
April 7, 2017: Addiction
https://www.readbyqxmd.com/read/28367127/alterations-of-intrinsic-brain-connectivity-patterns-in-depression-and-bipolar-disorders-a-critical-assessment-of-magnetoencephalography-based-evidence
#8
REVIEW
Golnoush Alamian, Ana-Sofía Hincapié, Etienne Combrisson, Thomas Thiery, Véronique Martel, Dmitrii Althukov, Karim Jerbi
Despite being the object of a thriving field of clinical research, the investigation of intrinsic brain network alterations in psychiatric illnesses is still in its early days. Because the pathological alterations are predominantly probed using functional magnetic resonance imaging (fMRI), many questions about the electrophysiological bases of resting-state alterations in psychiatric disorders, particularly among mood disorder patients, remain unanswered. Alongside important research using electroencephalography (EEG), the specific recent contributions and future promise of magnetoencephalography (MEG) in this field are not fully recognized and valued...
2017: Frontiers in Psychiatry
https://www.readbyqxmd.com/read/28360851/neuroimaging-genetics-and-clinical-data-sharing-in-python-using-the-cubicweb-framework
#9
Antoine Grigis, David Goyard, Robin Cherbonnier, Thomas Gareau, Dimitri Papadopoulos Orfanos, Nicolas Chauvat, Adrien Di Mascio, Gunter Schumann, Will Spooren, Declan Murphy, Vincent Frouin
In neurosciences or psychiatry, the emergence of large multi-center population imaging studies raises numerous technological challenges. From distributed data collection, across different institutions and countries, to final data publication service, one must handle the massive, heterogeneous, and complex data from genetics, imaging, demographics, or clinical scores. These data must be both efficiently obtained and downloadable. We present a Python solution, based on the CubicWeb open-source semantic framework, aimed at building population imaging study repositories...
2017: Frontiers in Neuroinformatics
https://www.readbyqxmd.com/read/28348383/prefrontal-gray-matter-volume-mediates-genetic-risks-for-obesity
#10
N Opel, R Redlich, C Kaehler, D Grotegerd, K Dohm, W Heindel, H Kugel, A Thalamuthu, N Koutsouleris, V Arolt, A Teuber, H Wersching, B T Baune, K Berger, U Dannlowski
Genetic and neuroimaging research has identified neurobiological correlates of obesity. However, evidence for an integrated model of genetic risk and brain structural alterations in the pathophysiology of obesity is still absent. Here we investigated the relationship between polygenic risk for obesity, gray matter structure and body mass index (BMI) by the use of univariate and multivariate analyses in two large, independent cohorts (n=330 and n=347). Higher BMI and higher polygenic risk for obesity were significantly associated with medial prefrontal gray matter decrease, and prefrontal gray matter was further shown to significantly mediate the effect of polygenic risk for obesity on BMI in both samples...
March 28, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28348381/greater-extracellular-free-water-in-first-episode-psychosis-predicts-better-neurocognitive-functioning
#11
A E Lyall, O Pasternak, D G Robinson, D Newell, J W Trampush, J A Gallego, M Fava, A K Malhotra, K H Karlsgodt, M Kubicki, P R Szeszko
Free Water Imaging is a novel diffusion magnetic resonance (MR) imaging method that is able to separate changes affecting the extracellular space from those that reflect changes in neuronal cells and processes. A previous Free Water Imaging study in schizophrenia identified significantly greater extracellular water volume in the early stages of the disorder; however, its clinical and functional sequelae have not yet been investigated. Here, we applied Free Water Imaging to a larger cohort of 63 first-episode patients with psychosis and 70 healthy matched controls to better understand the functional significance of greater extracellular water...
March 28, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28322272/neuroanatomic-epigenetic-and-genetic-differences-in-monozygotic-twins-discordant-for-attention-deficit-hyperactivity-disorder
#12
Y-C Chen, G Sudre, W Sharp, F Donovan, S C Chandrasekharappa, N Hansen, L Elnitski, P Shaw
The study of monozygotic twins discordant for attention deficit hyperactivity disorder can elucidate mechanisms that contribute to the disorder, which affects ~7% of children. First, using in vivo neuroanatomic imaging on 14 pairs of monozygotic twins (mean age 9.7, s.d. 1.9 years), we found that discordance for the disorder is mirrored by differing dimensions of deep brain structures (the striatum and cerebellum), but not the cerebral cortex. Next, using whole-blood DNA from the same twins, we found a significant enrichment of epigenetic differences in genes expressed in these 'discordant' brain structures...
March 21, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28295339/annual-research-review-childhood-maltreatment-latent-vulnerability-and-the-shift-to-preventative-psychiatry-the-contribution-of-functional-brain-imaging
#13
REVIEW
Eamon J McCrory, Mattia I Gerin, Essi Viding
BACKGROUND: Childhood maltreatment is a potent predictor of poor mental health across the life span. We argue that there is a need to improve the understanding of the mechanisms that confer psychiatric vulnerability following maltreatment, if we are to progress from simply treating those with a manifest disorder, to developing effective preventative approaches that can help offset the likelihood that such disorders will emerge in the first place. METHODS: We review extant functional neuroimaging studies of children and adolescents exposed to early neglect and/or maltreatment, including physical, sexual and emotional abuse across four neurocognitive domains: threat processing, reward processing, emotion regulation and executive control...
April 2017: Journal of Child Psychology and Psychiatry, and Allied Disciplines
https://www.readbyqxmd.com/read/28289283/the-dopamine-hypothesis-of-bipolar-affective-disorder-the-state-of-the-art-and-implications-for-treatment
#14
REVIEW
A H Ashok, T R Marques, S Jauhar, M M Nour, G M Goodwin, A H Young, O D Howes
Bipolar affective disorder is a common neuropsychiatric disorder. Although its neurobiological underpinnings are incompletely understood, the dopamine hypothesis has been a key theory of the pathophysiology of both manic and depressive phases of the illness for over four decades. The increased use of antidopaminergics in the treatment of this disorder and new in vivo neuroimaging and post-mortem studies makes it timely to review this theory. To do this, we conducted a systematic search for post-mortem, pharmacological, functional magnetic resonance and molecular imaging studies of dopamine function in bipolar disorder...
March 14, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28289280/biochemical-physiological-and-clinical-effects-of-l-methylfolate-in-schizophrenia-a-randomized-controlled-trial
#15
J L Roffman, L J Petruzzi, A S Tanner, H E Brown, H Eryilmaz, N F Ho, M Giegold, N J Silverstein, T Bottiglieri, D S Manoach, J W Smoller, D C Henderson, D C Goff
Folic acid supplementation confers modest benefit in schizophrenia, but its effectiveness is influenced by common genetic variants in the folate pathway that hinder conversion to its active form. We examined physiological and clinical effects of l-methylfolate, the fully reduced and bioactive form of folate, in schizophrenia. In this randomized, double-blind trial, outpatients with schizophrenia (n=55) received l-methylfolate 15 mg or placebo for 12 weeks. Patients were maintained on stable doses of antipsychotic medications...
March 14, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28283186/imaging-genetics-and-genomics-in-psychiatry-a-critical-review-of-progress-and-potential
#16
REVIEW
Ryan Bogdan, Betty Jo Salmeron, Caitlin E Carey, Arpana Agrawal, Vince D Calhoun, Hugh Garavan, Ahmad R Hariri, Andreas Heinz, Matthew N Hill, Andrew Holmes, Ned H Kalin, David Goldman
Imaging genetics and genomics research has begun to provide insight into the molecular and genetic architecture of neural phenotypes and the neural mechanisms through which genetic risk for psychopathology may emerge. As it approaches its third decade, imaging genetics is confronted by many challenges, including the proliferation of studies using small sample sizes and diverse designs, limited replication, problems with harmonization of neural phenotypes for meta-analysis, unclear mechanisms, and evidence that effect sizes may be more modest than originally posited, with increasing evidence of polygenicity...
January 13, 2017: Biological Psychiatry
https://www.readbyqxmd.com/read/28265121/brain-structural-and-functional-signatures-of-impulsive-compulsive-behaviours-in-parkinson-s-disease
#17
F Imperiale, F Agosta, E Canu, V Markovic, A Inuggi, M Jecmenica-Lukic, A Tomic, M Copetti, S Basaia, V S Kostic, M Filippi
This study assessed brain structural and functional alterations in patients with Parkinson's disease and impulsive-compulsive behaviours (PD-ICB) compared with controls and PD no-ICB cases. Eighty-five PD patients (35 PD-ICB) and 50 controls were recruited. All subjects underwent three-dimensional T1-weighted, diffusion tensor (DT), and resting state functional magnetic resonance imaging (RS fMRI). We assessed cortical thickness with surface-based morphometry, subcortical volumes using FIRST, DT MRI metrics using region of interest and tractography approaches, and RS fMRI using a model free approach...
March 7, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28265119/evidence-for-neuroplastic-compensation-in-the-cerebral-cortex-of-persons-with-depressive-illness
#18
R Bansal, D J Hellerstein, B S Peterson
We yoked anatomical brain magnetic resonance imaging to a randomized, double-blind, placebo-controlled trial (RCT) of antidepressant medication for 10-week's duration in patients with dysthymia. The RCT study design mitigated ascertainment bias by randomizing patients to receive either duloxetine or placebo, and it supported true causal inferences about treatment effects on the brain by controlling treatment assignment experimentally. We acquired 121 anatomical scans: at baseline and end point in 41 patients and once in 39 healthy controls...
March 7, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28242869/in-vivo-imaging-of-translocator-protein-a-marker-of-activated-microglia-in-alcohol-dependence
#19
A T Hillmer, C M Sandiego, J Hannestad, G A Angarita, A Kumar, E M McGovern, Y Huang, K C O'Connor, R E Carson, S S O'Malley, K P Cosgrove
Neuroinflammation may be a critical component of the neurobiology of alcohol use disorders, yet the exact nature of this relationship is not well understood. This work compared the brain and peripheral immune profile of alcohol-dependent subjects and controls. Brain levels of 18-kDa translocator protein (TSPO), a marker of microglial activation and neuroinflammation, were measured with [(11)C]PBR28 positron emission tomography imaging in 15 healthy controls and 15 alcohol-dependent subjects. Alcohol-dependent subjects were imaged 1-4 days (n=14) or 24 days (n=1) after their last drink...
February 28, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28236993/-what-role-for-paraclinical-investigations-within-clinical-trials-conducted-in-psychiatric-patients
#20
A Kaladjian, M Adida, N Simon, R Belzeaux, O Blin, E Fakra, J-M Azorin
As in the usual care of patients, paraclinical investigations have today only a very modest role in clinical trials in psychiatry, mainly to complete the pre-therapeutical assessments prior to inclusion of subjects or to monitor treatment tolerance. Yet, the accumulation of data in neurosciences suggests the next emergence of biomarkers, whose interest is that they are closely associated to the biological disturbances underlying psychiatric illnesses, and that they are accessible by means of technological tools such as imaging devices...
December 2016: L'Encéphale
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