1,664 research outputs found
Exploring the neural basis of real-life joint action: measuring brain activation during joint table setting with functional near-infrared spectroscopy (fNIRS)
No full textEgetemeir J, Stenneken P, Koehler S, Fallgatter AJ, Herrmann MJ. Exploring the neural basis of real-life joint action: measuring brain activation during joint table setting with functional near-infrared spectroscopy (fNIRS). Frontiers in Human Neuroscience. 2011;5(95):1-9
Joint action in a nearly natural situation. An investigation with functional near-infrared spectroscopy (fNIRS).
No full textEgetemeir J, Stenneken P, Fallgatter AJ, Herrmann MJ. Joint action in a nearly natural situation. An investigation with functional near-infrared spectroscopy (fNIRS). In: 17th Annual Meeting of the Cognitive Neuroscience Society (CNS) - Meeting Program. 2010: 277
The brain basis of real-life joint action. An investigation with functional near-infrared spectroscopy (fNIRS)
No full textEgetemeir J, Stenneken P, Fallgatter AJ, Herrmann MJ. The brain basis of real-life joint action. An investigation with functional near-infrared spectroscopy (fNIRS). In: Workshop on new perspectives on joint action and task sharing. 2010
sj-docx-1-asm-10.1177_10731911241236699 – Supplemental material for Validation of the Self-Report Version of the German Strengths and Weaknesses of ADHD Symptoms and Normal Behavior Scale (SWAN-DE-SB)
No full textSupplemental material, sj-docx-1-asm-10.1177_10731911241236699 for Validation of the Self-Report Version of the German Strengths and Weaknesses of ADHD Symptoms and Normal Behavior Scale (SWAN-DE-SB) by Friederike Blume, Lilly Buhr, Jan Kühnhausen, Rieke Köpke, Lydia A. Weber, Andreas J. Fallgatter, Thomas Ethofer and Caterina Gawrilow in Assessment</p
Brain activation during joint action measured with functional near-infrared spectroscopy
No full textEgetemeir J, Stenneken P, Koehler S, Fallgatter AJ, Herrmann MJ. Brain activation during joint action measured with functional near-infrared spectroscopy. Psychophysiology. 2009;46(S1):s33
My parietal cortex 'knows' what you are doing: the human mirror neuron system measured by fNIRS
No full textKoehler S, Egetemeir J, Stenneken P, Pauli P, Fallgatter AJ, Herrmann MJ. My parietal cortex 'knows' what you are doing: the human mirror neuron system measured by fNIRS. In: 49th Annual Meeting of the Society for Psychophysiological Research. Poster Session Abstracts. Psychophysiology. Vol 46. 2009: S33
Simulation of near-infrared light absorption considering individual head and prefrontal cortex anatomy: implications for optical neuroimaging
No full textFunctional near-infrared spectroscopy (fNIRS) is an established optical neuroimaging method for measuring functional hemodynamic responses to infer neural activation. However, the impact of individual anatomy on the sensitivity of fNIRS measuring hemodynamics within cortical gray matter is still unknown. By means of Monte Carlo simulations and structural MRI of 23 healthy subjects (mean age: (25.0 +- 2.8 years), we characterized the individual distribution of tissue-specific NIR-light absorption underneath 24 prefrontal fNIRS channels. We, thereby, investigated the impact of scalp-cortex distance (SCD), frontal sinus volume as well as sulcal morphology on gray matter volumes (V gray) traversed by NIR-light, i.e. anatomy-dependent fNIRS sensitivity. The NIR-light absorption between optodes was distributed describing a rotational ellipsoid with a mean penetration depth of (23.6 +- 0.7 mm) considering the deepest 5% of light. Of the detected photon packages scalp and bone absorbed (96.4 +- 9.7)% and absorbed (3,1 +- 1.8)% of the energy. The mean V gray volume (1.1 +- 0.4)cm 3 was negatively correlated (r = -.76) with the SCD and frontal sinus volume (r= -.57) and was reduced by in subjects with relatively large compared to small frontal sinus. Head circumference was significantly positively correlated with the mean SCD (r= .46) and the traversed frontal sinus volume (r= .43). Sulcal morphology had no significant impact on . Our findings suggest to consider individual SCD and frontal sinus volume as anatomical factors impacting fNIRS sensitivity. Head circumference may represent a practical measure to partly control for these sources of error variance
The role of the prefrontal cortex in maintenance and interference control processes of working memory assessed with multi-channel near-infrared spectroscopy
No full textEgetemeir J, Huter TJ, Pauli P, Fallgatter AJ, Herrmann MJ. The role of the prefrontal cortex in maintenance and interference control processes of working memory assessed with multi-channel near-infrared spectroscopy. Journal of Psychophysiology. 2006;20(2):139-140
Social cognition in autism: Face tuning
No full textFaces convey valuable information for social cognition, effective interpersonal interaction, and non-verbal communication. Face perception is believed to be atypical in autism, but the origin of this deficit is controversial. Dominant featural face encoding is suggested to be responsible for face tuning scarcity. Here we used a recently developed Face-n-Food paradigm for studying face tuning in individuals with autistic spectrum disorders (ASD). The key benefit of these images is that single components do not explicitly trigger face processing. In a spontaneous recognition task, adolescents with autism and typically developing matched controls were presented with a set of Face-n-Food images in different degree resembling a face (slightly bordering on the Giuseppe Arcimboldo style). The set of images was shown in a predetermined order from the least to most resembling a face. Thresholds for recognition of the Face-n-Food images as a face in ASD individuals were substantially higher than in typically developing controls: they did not report seeing a face on the images, which controls easily recognized as a face, and gave overall fewer face responses. This outcome not only lends support to atypical face tuning, but provides novel insights into the origin of face encoding deficits in autism
The DLPFC is centrally involved in resolving Stroop conflicts, suppressing distracting sensory input within the auditory and visual system
No full textIntroduction Cognitive control is a prerequisite for successful, goal-oriented behavior. The dorsolateral prefrontal cortex (DLPFC) is assumed to be a key player in applying cognitive control; however, the neural mechanisms by which this process is accomplished are still unclear. Methods To further address this question, an audiovisual Stroop task was used, comprising simultaneously presented pictures and spoken names of actors and politicians. Depending on the task block, participants had to indicate whether they saw the face or heard the name of a politician or an actor (visual vs. auditory blocks). In congruent trials, both stimuli (visual and auditory) belonged to the same response category (actor or politician); in incongruent trials, they belonged to different categories. During this task, activity in sensory target regions was measured via functional near-infrared spectroscopy (fNIRS) and electroencephalography (EEG), respectively. Specifically, fNIRS was used to monitor activity levels within the auditory cortex, while the EEG-based event-related potential of the N170 was considered as a marker of FFA (fusiform face area) involvement. Additionally, we assessed the effects of inhibitory theta-burst stimulation—a specific protocol based on repetitive transcranial magnetic stimulation (rTMS)—over the right DLPFC. Non-invasive brain stimulation is one of the few means to draw causal conclusions in human neuroscience. In this case, rTMS was used to temporarily inhibit the right DLPFC as a presumed key player in solving Stroop conflicts in one of two measurement sessions; then, effects were examined on behavioral measures as well as neurophysiological signals reflecting task-related activity in the frontal lobes and sensory cortices. Results The results indicate a central role of the DLPFC in the implementation of cognitive control in terms of a suppression of distracting sensory input in both the auditory cortex and visual system (FFA) in high-conflict situations. Behavioral data confirm a reduced Stroop effect following previous incongruent trials (“Gratton effect”) that was only accomplished with an intact DLPFC (i.e., following placebo stimulation). Discussion Because non-invasive brain stimulation is uniquely suited to causally test neuroscientific hypotheses in humans, these data give important insights into some of the mechanisms by which the DLPFC establishes conflict resolution across different sensory modalities
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