Filters








23,908 Hits in 7.5 sec

Response of the multiple-demand network during simple stimulus discriminations [article]

Tanya Wen, Daniel J Mitchell, John Duncan
2018 bioRxiv   pre-print
The multiple-demand (MD) network is sensitive to many aspects of task difficulty, including such factors as rule complexity, memory load, attentional switching and inhibition.  ...  We suggest that, for simple sensory discriminations, it may be impossible to compensate for reduced stimulus information by increased top-down control.  ...  Together they have been termed the multiple demand (MD) network (Duncan, 2010) , cognitive control network (Niendam et al., 2012) , or task positive network (Fox et al., 2005) .  ... 
doi:10.1101/296509 fatcat:gz5jqeinxnbphdq3nwr5y6f6zm

Response of the multiple-demand network during simple stimulus discriminations

Tanya Wen, Daniel J. Mitchell, John Duncan
2018 NeuroImage  
A B S T R A C T The multiple-demand (MD) network is sensitive to many aspects of task difficulty, including such factors as rule complexity, memory load, attentional switching and inhibition.  ...  We suggest that, for simple sensory discriminations, it may be impossible to compensate for reduced stimulus information by increased topdown control.  ...  TW was supported by the Taiwan Cambridge Scholarship from the Cambridge Commonwealth, European & International Trust and the Percy Lander studentship from Downing College.  ... 
doi:10.1016/j.neuroimage.2018.05.019 pmid:29753108 pmcid:PMC6019735 fatcat:mqbcwnvzozaedi6vkfadfx3lui

Simultaneous EEG–fMRI reveals a temporal cascade of task-related and default-mode activations during a simple target detection task

Jennifer M. Walz, Robin I. Goldman, Michael Carapezza, Jordan Muraskin, Truman R. Brown, Paul Sajda
2014 NeuroImage  
We then correlate the residual variance with the trial-to-trial variation of EEG discriminating components for identical stimuli, estimated at a sequence of times during a trial.  ...  During a simple visual oddball task, neural responses measured by electroencephalography (EEG) modulate primarily with attention, but source localization of the correlates is a challenge.  ...  Conflict of interest The authors declare no competing financial interests.  ... 
doi:10.1016/j.neuroimage.2013.08.014 pmid:23962956 pmcid:PMC3926909 fatcat:s2ogcjsjc5effblv5i5sggmpkm

Computational principles and models of multisensory integration

Chandramouli Chandrasekaran
2017 Current Opinion in Neurobiology  
Combining information from multiple senses creates robust percepts, speeds up responses, enhances learning, and improves detection, discrimination, and recognition.  ...  In this review, I discuss computational models and principles that provide insight into how this process of multisensory integration occurs at the behavioral and neural level.  ...  The content in this article is solely the responsibility of the author and does not necessarily represent the official views of the NIH or Stanford University.  ... 
doi:10.1016/j.conb.2016.11.002 pmid:27918886 pmcid:PMC5447489 fatcat:ajczxifjf5d3racmwcqn43r3te

Real-time experimental control using network-based parallel processing [article]

Byounghoon Kim, Shobha Channabasappa Kenchappa, Adhira Sunkara, Ting-Yu Chang, Lowell Thompson, Raymond Doudlah, Ari Rosenberg
2018 bioRxiv   pre-print
Modern neuroscience research often requires the coordination of multiple processes such as stimulus generation, real-time experimental control, as well as behavioral and neural measurements.  ...  The technical demands required to simultaneously manage these processes with high temporal fidelity limits the number of labs capable of performing such work.  ...  A simple way to set up communication with 229 such hardware is using multiple parallel networks such that each hardware piece has a single 230 dedicated network switch.  ... 
doi:10.1101/392654 fatcat:g4ow47zogncbxddsafr4zp3alq

Age Affects How Task Difficulty and Complexity Modulate Perceptual Decision-Making

Claudine Habak, Mohamed L. Seghier, Julie Brûlé, Mohamed A. Fahim, Oury Monchi
2019 Frontiers in Aging Neuroscience  
Perceptual complexity was varied in a factorial design while participants made perceptual judgments on the spatial frequency of two patches that either shared the same orientation (simple condition) or  ...  Psychophysical thresholds were measured for each participant in each condition and served to set individualized levels of difficulty during scanning.  ...  Orientation conditions were not interleaved but blocked, to avoid monitoring of multiple orientation channels (Graham, 1989) during the same orientation condition: if participants monitored more than  ... 
doi:10.3389/fnagi.2019.00028 pmid:30881300 pmcid:PMC6405634 fatcat:xhtykjmj4rg2rkvvhyjy2xal64

Population Code Dynamics in Categorical Perception

Chihiro I. Tajima, Satohiro Tajima, Kowa Koida, Hidehiko Komatsu, Kazuyuki Aihara, Hideyuki Suzuki
2016 Scientific Reports  
Moreover, we directly examine key model behaviors in the monkey visual cortex by analyzing neural population dynamics during categorization and discrimination of color stimuli.  ...  In particular, the reported complexity of categorical effects, including (i) task-dependent modulation of neural response, (ii) clustering of neural population representation, (iii) temporal evolution  ...  Acknowledgements This work was partially supported by the Grant-in-Aid for fellows of the Japan Society for the Promotion of Science (JSPS), by the Aihara Project, the FIRST program from JSPS, initiated  ... 
doi:10.1038/srep22536 pmid:26935275 pmcid:PMC4776180 fatcat:lepikhj7vjdw3dfsl5376vffmy

Orienting Towards Ensembles: From Single Cells to Neural Populations

C. M. Lewis, A. E. Lazar
2013 Journal of Neuroscience  
orientation is best distinguished during the initial transient of the neural response, reaching peak performance after only 30 -80 ms of stimulus presentation.  ...  Likewise, the immediate demands of task and cognitive state also frame and influence the response properties of cells in V1.  ... 
doi:10.1523/jneurosci.4658-12.2013 pmid:23283316 pmcid:PMC6618636 fatcat:7vvswvhhgzc7lbaroh3hgnh7ya

Sustaining attention to simple tasks: A meta-analytic review of the neural mechanisms of vigilant attention

Robert Langner, Simon B. Eickhoff
2013 Psychological bulletin  
We discuss the potential functional roles of different nodes of this network as well as implications of our findings for a theoretical account of vigilant attention.  ...  Intriguingly, such decrements are even more likely if the task is cognitively simple and repetitive.  ...  The task posed only minimal cognitive demands, that is, did not require more than stimulus discrimination associated with a simple overt (e.g., manual) or covert (e.g., counting) response. 3.  ... 
doi:10.1037/a0030694 pmid:23163491 pmcid:PMC3627747 fatcat:enck7fe5h5by3ae5qchf7g4z4e

Components of recognition memory: Dissociable cognitive processes or just differences in representational complexity?

Rosemary A. Cowell, Timothy J. Bussey, Lisa M. Saksida
2010 Hippocampus  
We then discuss whether the principles of the representational-hierarchical framework can be used to understand recollection and familiarity in terms of stimulus complexity, and use these principles to  ...  According to this view cognition, perception, memory, and indeed amnesia may be understood by considering the content and organization of stimulus representations in the brain.  ...  We simulate recognition memory by presenting a stimulus to the network for a short period of time, during which the network repeatedly ''samples'' the stimulus, such that its representation within the  ... 
doi:10.1002/hipo.20865 pmid:20882548 fatcat:24muq5albjfzlbmwtf6wk72kdm

State-Dependent Visual Processing

Juliane Britz, Christoph M. Michel
2011 Frontiers in Psychology  
The temporal dynamics and anatomical correlates underlying human visual cognition are traditionally assessed as a function of stimulus properties and task demands.  ...  Any nonstimulus related activity is commonly dismissed as noise and eliminated to extract an evoked signal that is only a small fraction of the magnitude of the measured signal.  ...  ACKNOWLEDGMENTS This research was supported by the Swiss National Science Foundation (grant 310030-132952) and by the Center for Biomedical Imaging (CIBM) of the Geneva and Lausanne Universities, EPFL.  ... 
doi:10.3389/fpsyg.2011.00370 pmid:22203809 pmcid:PMC3241342 fatcat:4z7lqqimq5gojbdwmbp5uyitj4

The multiple-demand (MD) system of the primate brain: mental programs for intelligent behaviour

John Duncan
2010 Trends in Cognitive Sciences  
] ; at the same time, phasic responses during demanding trials can certainly be seen in the lateral prefrontal cortex [61, 62] , and tonic responses in the anterior cingulate [5, 63] .  ...  A common or multiple-demand (MD) pattern of frontal and parietal activity is associated with diverse cognitive demands, and with standard tests of fluid intelligence.  ... 
doi:10.1016/j.tics.2010.01.004 pmid:20171926 fatcat:ihorm7w3gbgyxh4bdxlwun2xx4

Feature uncertainty activates anterior cingulate cortex

Szabolcs Kéri, Jean Decety, Per E. Roland, Balázs Gulyás
2003 Human Brain Mapping  
There was greater activity during the feature uncertainty task, compared with stimulus detection and discrimination of orientation and spatial frequency, in the lateral and medial prefrontal cortex, the  ...  In visual discrimination tasks, the relevant feature to discriminate is defined before stimulus presentation.  ...  ACKNOWLEDGMENTS Szabolcs Kéri was supported by a post doctoral stipend from the Wenner-Gren Foundation, Stockholm, Sweden. We express our gratitude to Dr. Rufin Vogels for his suggestions and advice.  ... 
doi:10.1002/hbm.10150 pmid:14689507 fatcat:r3b2a27qkvajtbjwhpjefdf6ri

Cognitive-motivational interactions: Beyond boxes-and-arrows models of the mind-brain

Luiz Pessoa
2017 Motivation Science  
Perception and motivational significance (A) Abstract representation of a priority map containing spatial locations of behavioral importance which are determined by combining multiple classes of information  ...  (B) Perceptual competition is influenced by these factors which determine the stimulus representation to be prioritized ("wins the competition"). Pessoa  ...  Acknowledgments The author acknowledges funding from the National Institute of Mental Health (MH071589) and assistance with figures and references from Christian Meyer and Anastasiia Khibovska.  ... 
doi:10.1037/mot0000074 pmid:29399604 pmcid:PMC5793941 fatcat:upyglcdlobbszld67scj6ggemi

Similarity Effect and Optimal Control of Multiple-Choice Decision Making

Moran Furman, Xiao-Jing Wang
2008 Neuron  
The model encodes a continuous analog stimulus feature and is thus applicable to multiple-choice decisions.  ...  We also found that the similarity and number of options affect speed and accuracy of responses.  ...  Figure 1 . 1 The Multiple-Choice Motion Discrimination Task and Network Architecture Figure 2 . 2 Simulation Protocol (A) Schematic time course of the input signals.  ... 
doi:10.1016/j.neuron.2008.12.003 pmid:19109918 pmcid:PMC2633638 fatcat:n6wylypf65eq5g626ponxpfq44
« Previous Showing results 1 — 15 out of 23,908 results