Christoph Siegfried Herrmann

This study investigates whether transcranial temporal interference stimulation (tTIS) modulates occipital alpha power compared to sham and carrier control, finding significant increases with tTIS.

This study investigates how pre-sensorimotor brain activity affects TMS-evoked potentials during motor imagery, finding that trial-by-trial variability in brain states influences TEP amplitudes.

This study investigates tACS parameters for cochlear stimulation, finding that frequencies between 250 Hz and 2000 Hz reliably elicit auditory impressions with minimal side effects.

This study shows neurofeedback can enhance neural responses to speech in noisy environments, improving speech comprehension through targeted training.

This study shows that carbonized rubber electrodes in transcranial alternating current stimulation cause a measurable DC-offset, which can interfere with concurrent EEG recordings.

This study analyzes the effects of tACS on brain oscillations and aperiodic 1/f activity using spectral parameterization, finding that the aftereffect persists even after correcting for 1/f activity.

The paper applies personalized alpha-tACS to the left parietal cortex and finds it enhances left hemifield attention and reduces posterior EEG lateralization.

The paper investigates how task difficulty modulates the P3m component using MEG and identifies its sources in centro-parietal regions.

This study characterizes low-frequency artifacts during tTIS and shows that neurophysiological data can be acquired without stimulation artifacts at low-frequencies with appropriate hardware.

This study shows that tACS applied to the occipital region modulates brightness perception of flickering light based on the phase shift between stimulation and neural activity.

This study investigates whether endogenous gamma oscillations in the human visual cortex can be entrained by high-frequency visual flicker, finding no evidence of entrainment and instead showing coexistence of flicker responses and gamma oscillations.

This study uses Hidden Markov Models to analyze tACS-MEG data and finds that only one of four brain states is susceptible to tACS effects.

This study evaluates artifact correction techniques for tACS-contaminated EEG data, finding that signal-space projection (SSP) effectively suppresses the tACS artifact while preserving brain activity.

This study investigates how the phase of transcranial alternating current stimulation (tACS) affects visually evoked steady state responses (SSRs) in humans, finding that phase shifts modulate SSR amplitudes and that optimal timing depends on neural conduction times.

The paper integrates electric field modeling with neuroimaging to show that individual electric field differences predict variability in tACS effects on brain oscillations.

The paper investigates how temporal expectation affects sensory memory decay by analyzing neural oscillations and connectivity patterns during a delayed matching-to-sample task.

This study shows that non-linearities in stimulation and recording hardware create spurious low-frequency artifacts during AM-tACS, which can be mistaken for true neural effects.

This study shows that individualized transcranial alternating current stimulation can improve auditory temporal resolution in elderly people by modulating gamma frequency.

This study uses tACS-MEG to show that tACS enhances pre-existing alpha band power modulations during a mental rotation task without counteracting intrinsic oscillations.

This study shows that alpha and gamma stimulation have opposite effects on spatial attention, with alpha reducing and gamma enhancing recall of attended speech.

This study shows that transcranial alternating current stimulation (tACS) applied in sync with speech envelopes improves speech comprehension in noise.