Hartwig Roman Siebner

This study shows that transcranial magnetic stimulation of the human leg motor area elicits iTEPs similar to those from the hand area, suggesting a general cortical response.

This study investigates the effects of low-intensity theta-burst ultrasound stimulation on corticospinal excitability and finds no consistent group-level changes in motor evoked potentials.

This study links nigrostriatal dopamine loss to reduced motor vigour in Parkinson's disease using functional MRI and dopamine transporter PET, showing impaired striatal recruitment and reward-related signaling.

The paper examines how cortical and corticospinal excitability changes during different beta-band states of movement, finding opposing patterns in their modulation.

This study examines age-related differences in brain activity during a bimanual task, finding increased cerebellar activity and reduced frontal recruitment in older adults.

The paper directly measures motor cortical inhibition using immediate TMS-evoked potentials (iTEPs) instead of motor-evoked potentials (MEPs), showing iTEPs provide a more accurate reflection of GABAergic inhibition.

The paper investigates how predictive processing networks change with age, finding that aging redistributes resources across subsystems rather than uniformly weakening them.

This study shows that Parkinson's Disease causes reduced structural and functional activity in the caudal locus coeruleus, linked to non-motor symptoms.

This study introduces a method to estimate the controllability Gramian matrix using perturbation inputs and network control theory to analyze brain dynamics, showing that controllable directions better differentiate brain states than overall controllability.

The paper investigates whether brain-behavior associations in the bimanual motor network differ between younger and older adults, finding no evidence of stronger associations in older adults.

This study compares the effects of sinusoidal and amplitude-modulated tACS on corticospinal excitability in human motor cortex, finding frequency-specific and temporally distinct effects.

The paper compares how motor state affects corticospinal and cortical responses to TMS, finding they are modulated differently.

The paper maps rostro-caudal transcranial evoked potentials (iTEPs) using TMS-EEG and compares them to motor-evoked potentials (MEPs), finding similar but distinct spatial patterns.

The paper optimizes a finite-element method for faster electric field calculations in transcranial magnetic stimulation, achieving higher update rates with reduced computational resources.

This study compares the spatial properties of corticomotor maps elicited by single-pulse and paired-pulse TMS in humans, finding spatially distinct cortical circuits for single- and paired-pulse TMS.

The paper compares structure-function relationships in axons using multiple modalities, finding that different methods capture different aspects of axon diameter and conduction velocity distributions.

This study systematically compares TMS-EEG studies on the primary motor cortex, finding that methodological choices affect TEP amplitudes and latencies.

The paper introduces an EM-algorithm for banded regression to enable group-specific shrinkage in neuroscience models, demonstrating its use in fMRI and EEG analyses.

The paper introduces an extended head model for transcranial electric stimulation simulations, showing improved accuracy for extracephalic montages and better focality in cerebellar stimulation.

The paper records immediate transcranial evoked potentials (i-TEPs) from TMS of the primary motor cortex and finds they are site-specific and modulated by stimulation parameters.

This study uses fMRI to investigate brain activity during bimanual pinch force tasks, finding increased activation and coupling in premotor and motor areas during asymmetric force control.

This paper investigates the link between impulsivity and preSMA activity during sequential gambling using rTMS, finding that preSMA modulation alters the relationship between trait and state impulsivity.

The paper examines longitudinal DTI data to show that neuroticism is associated with cingulum microstructural asymmetry, with stable associations in females and emerging ones in males during adolescence.

The paper uses optogenetic stimulation to study transcallosal M1-M1 interactions in rats, finding a consistent negative peak response with variable amplitude and stable latency.

This study investigates whether short-duration anodal TDCS induces dose-dependent increases in cerebral blood flow in the motor cortex, finding no such effect.

This study examines the relationship between high-frequency oscillations in the sensory and motor hand areas and regional myelin content in the human sensorimotor cortex.

This study investigates short-latency corticomotor facilitation from multi-pulse TMS, identifying two distinct mechanisms: one linked to I-wave periodicity and another independent of it.

The paper investigates how recent electrical stimulation history affects corticospinal excitability and short-latency afferent inhibition (SAI) in human motor cortex.

This paper analyzes the limitations of current MRCDI reconstruction methods and proposes a statistical testing framework to improve accuracy in human brain current density imaging.

This paper improves the sensitivity and resolution of in-vivo magnetic resonance current density imaging (MRCDI) through methodological advancements and validates it using phantom and human brain experiments.