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Showing 1–4 of 4 results

Advanced filters: Author: Randolph F. Helfrich Clear advanced filters

Aperiodic 1/f noise drives ripple activity in humans

How aperiodic 1/f noise drives ripple activity in human brain and impacts on ripple detections is not fully understood. Here authors show that ripple detections should be driven by the 1/f noise, which indexes different brain states and cognitive demands.

Frank J. van Schalkwijk
Randolph F. Helfrich
ResearchOpen Access17 Jan 2026
Nature Communications

Volume: 17, P: 1-12
Ramping dynamics and theta oscillations reflect dissociable signatures during rule-guided human behavior

The authors show that neuronal populations in the human prefrontal-motor network interact via two discernible communication modes – ramping dynamics and neural oscillations. These modes operate in concert to facilitate rule-guided behavior.

Jan Weber
Anne-Kristin Solbakk
Randolph F. Helfrich
ResearchOpen Access20 Jan 2024
Nature Communications

Volume: 15, P: 1-16
High-frequency bursts facilitate fast communication for human spatial attention

Using intracranial electroencephalography from patients with epilepsy during spatial attention tasks, this study shows that high-frequency bursts facilitate fast communications in brain networks and support attentional information routing.

Kianoush Banaie Boroujeni
Randolph F. Helfrich
Sabine Kastner
Research02 Dec 2025
Nature Neuroscience

Volume: 29, P: 435-444
Bidirectional prefrontal-hippocampal dynamics organize information transfer during sleep in humans

How are memories transferred from short-term to long-term storage? Here, the authors show that during deep (NREM) sleep, the prefrontal cortex initiates rapid, bidirectional interactions to trigger information transfer from the hippocampus to the neocortex.

Randolph F. Helfrich
Janna D. Lendner
Robert T. Knight
ResearchOpen Access08 Aug 2019
Nature Communications

Volume: 10, P: 1-16