Marcus Hasselhorn

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The neural correlates of developmental dyslexia have been investigated intensively over the last two decades and reliable evidence for a dysfunction of left-hemispheric reading systems in dyslexic readers has been found in functional neuroimaging studies. In addition, structural imaging studies using voxel-based morphometry (VBM) demonstrated grey matter(More)
OBJECTIVE To investigate the relations among self-awareness (SA), impaired SA, and health-related quality of life (HRQOL) after traumatic brain injury (TBI). PARTICIPANTS One hundred forty-one adults hospitalized with TBI and their significant others from a cross-sectional multicenter study. Using Glasgow Coma Scale classification, 32 participants had(More)
Many studies suggest that age differences in a variety of cognitive tasks are due to age-related changes in executive control processes. However, not all executive control processes seem to be age-sensitive. Recently, Verhaeghen et al. (2005) described dissociable age effects in an executive control process responsible for the switching of representations(More)
The existence of across-notation automatic numerical processing of two-digit (2D) numbers was explored using size comparisons tasks. Participants were Arabic speakers, who use two sets of numerical symbols—Arabic and Indian. They were presented with pairs of 2D numbers in the same or in mixed notations. Responses for a numerical comparison task were(More)
Three negative-priming studies were carried out to examine whether this paradigm allows a separation of the effects of aging on access, deletion, and restraint control of inhibition. In each study 24 younger (18 to 35 years old) and 24 older (57 to 82 years old) adults were asked to identify pictures. The results reveal difficulties among older adults in(More)
Hecke Schrobsdorff, Matthias Ihrke, Björn Kabisch Jörg Behrendt, Marcus Hasselhorn, J. Michael Herrmann 1 Bernstein Center for Computational Neuroscience Göttingen 2 Institute for Nonlinear Dynamics, Göttingen University Bunsenstr. 10, 37073 Göttingen, Germany 3 Georg-Elias-Müller-Institute, Göttingen University Waldweg 26, 37073 Göttingen, Germany(More)
The approximate number system (ANS) is assumingly related to mathematical learning but evidence supporting this assumption is mixed. The inconsistent findings might be attributed to the fact that different measures have been used to assess the ANS and mathematical skills. Moreover, associations between the performance on a measure of the ANS and(More)
Event-related potentials (ERPs) were obtained from an identity priming task, where a green target had to be selected against a superimposed red distractor. Several priming conditions were realized in a mix of control (CO), negative priming (NP), and positive priming (PP) trials. PP and NP effects in reaction times (RTs) were significant. ERP results(More)
Neural systems involved in the processing of written language have been identified by a number of functional imaging studies. Structural changes in cortical anatomy that occur in the course of literacy acquisition, however, remain largely unknown. Here, we follow elementary school children over their first 2 years of formal reading instruction and use(More)
We introduce a computational model of the negative priming (NP) effect that includes perception, memory, attention, decision making, and action. The model is designed to provide a coherent picture across competing theories of NP. The model is formulated in terms of abstract dynamics for the activations of features, their binding into object entities, their(More)