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A BOLD search for baseline

Robert G. Shulman, Douglas L. Rothman, Fahmeed Hyder
2007 NeuroImage  
While their main findings point to an energetic basis for the negative BOLD signal, their results have far reaching implications for the present definition of baseline as well as for future research investigating  ...  Pasley et al (2006) used calibrated fMRI in conjunction with a novel stimulus paradigm to investigate the neural basis of the negative BOLD signal in awake humans.  ...  Acknowledgments We are grateful for support from National Institutes of Health R01 grants (DC-03710 to FH; MH-67528 to FH; NS-037527 to DLR; NS-051854 to DLR) and appreciate engineers of MRRC (mrrc.yale.edu  ... 
doi:10.1016/j.neuroimage.2006.11.035 pmid:17223362 pmcid:PMC2684871 fatcat:vnt3bta3gnggtdt5voxanckyga

Multiple neural correlates of detection in the human brain

G. L. Shulman
2000 Proceedings of the National Academy of Sciences of the United States of America  
Many other regions, however, including areas in prefrontal cortex and anterior cingulate, were not involved in searching for a target.  ...  These regions, many of which were motion sensitive, were likely involved in searching for and detecting the target.  ...  Akbudak, and A. Snyder for software development; F. Miezin for constructing the behavioral apparatus; and B. Schlagger and L. Snyder for comments.  ... 
doi:10.1073/pnas.021381198 pmid:11134528 pmcid:PMC14587 fatcat:w4reus3d3rggrk5c37t62qiebe

Multiple neural correlates of detection in the human brain

G. L. Shulman, J. M. Ollinger, M. Linenweber, S. E. Petersen, M. Corbetta
2001 Proceedings of the National Academy of Sciences of the United States of America  
Many other regions, however, including areas in prefrontal cortex and anterior cingulate, were not involved in searching for a target.  ...  These regions, many of which were motion sensitive, were likely involved in searching for and detecting the target.  ...  Akbudak, and A. Snyder for software development; F. Miezin for constructing the behavioral apparatus; and B. Schlagger and L. Snyder for comments.  ... 
doi:10.1073/pnas.98.1.313 pmid:11134528 pmcid:PMC14587 fatcat:6fesfv4earhojh2jfhfmarj4yu

Separating distractor rejection and target detection in posterior parietal cortex—an event-related fMRI study of visual marking

S Pollmann, R Weidner, G.W Humphreys, C.N.L Olivers, K Müller, G Lohmann, C.J Wiggins, D.G Watson
2003 NeuroImage  
Successful survival in a competitive world requires the employment of efficient procedures for selecting new in preference to old information.  ...  Event-related analysis of functional magnetic resonance imaging data from a task involving visual search across time as well as space indicates that the superior parietal lobule is specifically involved  ...  We thank two anonymous reviewers for their helpful comments.  ... 
doi:10.1016/s1053-8119(02)00036-8 pmid:12595185 fatcat:n3j533r4mrf63dun4z2pngyagi

DECOMPOSITION OF NEURAL CIRCUITS OF HUMAN ATTENTION USING A MODEL-BASED ANALYSIS: sSoTS MODEL APPLICATION TO fMRI DATA

EIRINI MAVRITSAKI, HARRIET ALLEN, GLYN HUMPHREYS
2009 Connectionist Models of Behaviour and Cognition II  
The model for visual search over time and space (sSoTS) incorporates different synaptic components (NMDA, AMPA, GABA) and a frequency adaptation mechanism based on IAHP current.  ...  In this study we use the model to decompose the neural regions mediating the processes of active attentional guidance, and the inhibition of distractors, in search.  ...  baseline), standard preview search and preview search with a working memory load (the loaded search condition). data in precuneus by convolving the activation with the HDR.  ... 
doi:10.1142/9789812834232_0033 fatcat:wvxwtrw4ejgdbkte4zjz2eyiqm

Model Based Analysis of fMRI-Data: Applying the sSoTS Framework to the Neural Basic of Preview Search [chapter]

Eirini Mavritsaki, Harriet Allen, Glyn Humphreys
2009 Lecture Notes in Computer Science  
Here we used sSoTS to help decompose the fMRI signals found in a preview search procedure, when participants search for a new target whilst ignoring old distractors.  ...  The time course of activity linked to inhibitory and excitatory processes in the model was used as a regressor for the fMRI data.  ...  single feature search (the half set baseline), conjunction search (the full set baseline), standard preview search and preview search with a working memory load (the loaded search condition).  ... 
doi:10.1007/978-3-642-00582-4_10 fatcat:2bygptrqsze6xmlbvodsz2koqe

Mere exposure effect(s) in the context of explicit memory search

David Grybinas, Justin Kantner, Ian G. Dobbins
2019 Memory & Cognition  
This suggests that it is the outcome of memory search that alters pleasantness ratings in the context of retrieval demands, and we discuss how this confirmation of search (COS) hypothesis accounts for  ...  As important, items endorsed as unstudied, rejected as originating from a queried source, or failing to yield successful recall of a paired associated were rated as less pleasant than baseline norms.  ...  Table 1 1 Means and standard deviations for proportion Bold^response outcome as a function of a 3(Group) × 2(Response Outcome) design in Experiment 2Note.  ... 
doi:10.3758/s13421-019-00935-3 pmid:31144203 fatcat:mjvdgf6czvaj3m4vdcsuy5kk4q

Systematic Review: Anaesthetic Protocols and Management as Confounders in Rodent Blood Oxygen Level Dependent Functional Magnetic Resonance Imaging (BOLD fMRI)–Part A: Effects of Changes in Physiological Parameters

Aline R. Steiner, Frédérik Rousseau-Blass, Aileen Schroeter, Sonja Hartnack, Regula Bettschart-Wolfensberger
2020 Frontiers in Neuroscience  
Four databases were searched, studies selected according to pre-defined criteria, and risk of bias assessed for each study.  ...  Because animals need to be immobilised for image acquisition, fMRI is commonly performed under anaesthesia.  ...  Search Strategy A systematic search strategy was developed with support from the university's library service.  ... 
doi:10.3389/fnins.2020.577119 pmid:33192261 pmcid:PMC7646331 fatcat:6xm4dxte7zbk3bfilokdsr6moi

Effectiveness of the open bite treatment in growing children and adolescents. A systematic review

Murilo Fernando Neuppmann Feres, Lucas Guimarães Abreu, Natalia Martins Insabralde, Márcio Rodrigues de Almeida, Carlos Flores-Mir
2015 European Journal of Orthodontics  
Results Study selection After electronic searching, inclusion of hand-searched studies, and screening phase, 65 studies were pre-selected for full reading. From  ...  However, some useful clinical inferences and suggestions for future studies were provided for each therapeutic modality considered here.  ...  A search strategy was originally designed for PubMed, and subsequently adapted to the remaining databases (Supplementary Appendix 1).  ... 
doi:10.1093/ejo/cjv048 pmid:26136439 pmcid:PMC4914905 fatcat:fuhjdazudbfctdpwnen25rvqqa

Cerebral perfusion and oxygenation differences in Alzheimer's disease risk

Adam S. Fleisher, Katherine M. Podraza, Katherine J. Bangen, Curtis Taylor, Ayesha Sherzai, Kunal Sidhar, Thomas T. Liu, Anders M. Dale, Richard B. Buxton
2009 Neurobiology of Aging  
in different risk groups for AD.  ...  These data demonstrate that individuals with increased risk for Alzheimer's disease have elevated MTL resting cerebral blood flow, which significantly influences apparent differences in BOLD activations  ...  Acknowledgement This research was funded by a National Institute on Aging grant: k23 AG024062.  ... 
doi:10.1016/j.neurobiolaging.2008.01.012 pmid:18325636 pmcid:PMC2746874 fatcat:ljbphxvgardxlb7pnfwt6dcnyi

Time-on-task and sleep deprivation effects are evidenced in overlapping brain areas

Christopher L. Asplund, Michael W.L. Chee
2013 NeuroImage  
Sleep deprivation and time-on-task caused a decline of both measures in ventral visual cortex. BOLD fMRI also revealed such declines in fronto-parietal cortex.  ...  We compared task-related changes in BOLD signal alongside ASL-based cerebral blood flow (CBF) changes. We also collected resting baseline CBF data prior to and following task performance.  ...  Acknowledgments The authors thank Xavier Golay and Wen-Chau Wu for technical assistance and helpful discussion.  ... 
doi:10.1016/j.neuroimage.2013.05.119 pmid:23747456 fatcat:jhwnh5wvmfaercnk3da7b6di6u

Right TPJ Deactivation during Visual Search: Functional Significance and Support for a Filter Hypothesis

G. L. Shulman, S. V. Astafiev, M. P. McAvoy, G. d'Avossa, M. Corbetta
2007 Cerebral Cortex  
When subjects monitor a stream of distracter objects for a target, TPJ deactivates until the target is detected.  ...  An analysis of the blood oxygenation level--dependent (BOLD) task-evoked signals from 20 subjects during 2 monitoring tasks confirmed this prediction for regions in right supramarginal gyrus (SMG).  ...  to a no-task baseline.  ... 
doi:10.1093/cercor/bhl170 pmid:17264254 fatcat:w5kmeed5sfeexjuwryiyf2om6e

Functional brain organization for visual search in ASD

BRANDON KEEHN, LAURIE BRENNER, ERICA PALMER, ALAN J. LINCOLN, RALPH-AXEL MÜLLER
2008 Journal of the International Neuropsychological Society  
Direct comparisons (for both homogeneous and heterogeneous search conditions) revealed greater activation in occipital and frontoparietal regions in ASD than in TD participants.  ...  We used a visual search paradigm, manipulating search difficulty by varying set size (6, 12, or 24 items), distractor composition (heterogeneous or homogeneous) and target presence to identify brain regions  ...  Special thanks to Frank Haist for technical assistance, to Natacha Akshoomoff for help in the recruitment and diagnosis of participants with autism, and especially to the children and families who generously  ... 
doi:10.1017/s1355617708081356 pmid:18954479 fatcat:37bbtfzu7feldaxbokwytr2svi

Episodic Memory Retrieval, Parietal Cortex, and the Default Mode Network: Functional and Topographic Analyses

C. Sestieri, M. Corbetta, G. L. Romani, G. L. Shulman
2011 Journal of Neuroscience  
Finally, a robust functional dissociation within the DMN was observed.  ...  Moreover, a parahippocampal region that showed strong resting-state connectivity with parietal DMN regions also exhibited a pattern of task-evoked activity similar to that exhibited by DMN regions.  ...  to the baseline in the memory search task.  ... 
doi:10.1523/jneurosci.3335-10.2011 pmid:21430142 pmcid:PMC3098040 fatcat:65vto6hcnfdahbrpvt7qavtddm

Data and Supplementary Figures and Tables from Meta-analysis reveals weak associations between intrinsic state and personality

Petri T. Niemelä, Niels J. Dingemanse
2018 Figshare  
Our literature search showed that only 22% of the studies claiming to estimate individual-level associations between state and behaviour actually did so.  ...  We conducted a meta-analysis estimating the amount of among-individual variation in behaviour attributable to variation in state.  ...  Search terms used in our Web Of Science and Scopus searches.  ... 
doi:10.6084/m9.figshare.5977747.v1 fatcat:kkyuhdgjundbzfm4tvmxrz75da
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