Christopher Gundlach

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During simultaneous EEG-fMRI acquisition, the EEG signal suffers from tremendous artifacts caused by the scanner "environment". Particularly, gradient artifacts and the ballistocardiogram have been well characterized, along with methods to eliminate them. Here, we describe another systematic artifact in the EEG signal, which is induced by the internal(More)
Perception of illusory contours was shown to be a consequence of neural activity related to spatial integration in early visual areas. Candidates for such filling-in phenomena are long-range horizontal connections of neurons in V1/V2, and feedback from higher order visual areas. To get a direct measure of spatial integration in early visual cortex, we(More)
BACKGROUND Why are weak sensory stimuli sometimes perceived and other times not? Experimental paradigms using near-threshold stimuli suggest that spontaneous brain network dynamics are involved in separating relevant from irrelevant information. Recent findings in human visual perception provide evidence that the immediate spontaneous brain state, i.e. the(More)
OBJECTIVE The aim of the study was to investigate the effects of facilitatory anodal tDCS (a-tDCS) applied over the leg area of the primary motor cortex on learning a complex whole-body dynamic balancing task (DBT). We hypothesized that a-tDCS during DBT enhances learning performance compared to sham tDCS (s-tDCS). METHODS In a randomized, parallel(More)
Transcranial direct current stimulation (tDCS) modulates cortical excitability thereby influencing behavior and learning. While previous studies focused on tDCS after-effects, limited information about "online" tDCS effects is available. This in turn is an important prerequisite to better characterize and/or optimize tDCS effects. Here, we aimed to explore(More)
Older adults frequently experience a decrease in balance control that leads to increased numbers of falls, injuries and hospitalization. Therefore, evaluating older adults' ability to maintain balance and examining new approaches to counteract age-related decline in balance control is of great importance for fall prevention and healthy aging. Non-invasive(More)
A single dose of dichlorvos (2,2-dichlorovinyl dimethyl phosphate) was administered orally at a dosage of 30 mg/kg to 19 dogs naturally infected with Trichuris vulpis and to 13 dogs experimentally infected with T vulpis. Based on the presence or absence of whipworm eggs in the feces, 10 to 14 days after treatment, dogs were either killed and the number of(More)
Previous studies on sustained tactile attention draw conclusions about underlying cortical networks by averaging over experimental conditions without considering attentional variance in single trials. This may have formed an imprecise picture of brain processes underpinning sustained tactile attention. In the present study, we simultaneously recorded(More)
Low spatial frequency (LSF) image content has been proposed to play a superior functional role in emotional content extraction via the magnocellular pathway biasing attentional resources toward emotional content in visual cortex. We investigated whether emotionally unpleasant complex images that were presented either unfiltered or with LSF content only in(More)