T
Tobias Sommer
Researcher at University of Hamburg
Publications - 101
Citations - 7977
Tobias Sommer is an academic researcher from University of Hamburg. The author has contributed to research in topics: Amygdala & Hippocampus. The author has an hindex of 33, co-authored 91 publications receiving 7047 citations. Previous affiliations of Tobias Sommer include University of Mainz & Nord University.
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Journal ArticleDOI
Testing the Efficiency and Independence of Attentional Networks
TL;DR: A study with 40 normal adult subjects indicates that the ANT produces reliable single subject estimates of alerting, orienting, and executive function, and further suggests that the efficiencies of these three networks are uncorrelated.
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Dissociable Systems for Gain- and Loss-Related Value Predictions and Errors of Prediction in the Human Brain
Juliana Yacubian,Jan Gläscher,Katrin Schroeder,Tobias Sommer,Dieter F. Braus,Christian Büchel +5 more
TL;DR: Using functional magnetic resonance imaging and a guessing task in two large cohorts, it is able to confirm ventral striatal responses coding both reward probability and magnitude during anticipation, permitting the local computation of expected value (EV).
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Mapping the genetic variation of executive attention onto brain activity
TL;DR: Genotyping 16 subjects for the DRD4 and MAOA genes found a polymorphism in which persons with the allele associated with better behavioral performance showed significantly more activation in the anterior cingulate while performing the Attention Network Test (ANT).
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Assessing the molecular genetics of attention networks
John Fossella,Tobias Sommer,Jin Fan,Yanhong Wu,James M. Swanson,Donald W. Pfaff,Michael I. Posner +6 more
TL;DR: The ANT is validated as an endophenotypic assay suitable for assessing how genes influence certain anatomical networks that may be disrupted in various psychiatric disorders and suggests that genetic variation may underlie inter-subject variation in the efficiency of executive attention.
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Gene–gene interaction associated with neural reward sensitivity
Juliana Yacubian,Tobias Sommer,Katrin Schroeder,Jan Gläscher,Raffael Kalisch,Boris Leuenberger,Dieter F. Braus,Christian Büchel +7 more
TL;DR: Although most genotype combinations exhibited the expected activity increase with more likely and larger rewards, two genotypes were associated with blunted ventral striatal responses, pointing to a potential genetic basis for vulnerability to addiction.