Janna D Helfrich, MD

Hahn M, Lendner J, Anwander M, Slama K, Knight R, Lin J, Helfrich R. A tradeoff between efficiency and robustness in the hippocampal-neocortical memory network during human and rodent sleep. Progress In Neurobiology 2024, 242: 102672. PMID: 39369838, DOI: 10.1016/j.pneurobio.2024.102672.

Lendner J, Helfrich R. Defining slow wave sleep without slow waves. Trends In Neurosciences 2024, 47: 853-855. PMID: 39327160, DOI: 10.1016/j.tins.2024.09.002.

Lendner J, Lin J, Larsson P, Helfrich R. Multiple Intrinsic Timescales Govern Distinct Brain States in Human Sleep. Journal Of Neuroscience 2024, 44: e0171242024. PMID: 39187378, PMCID: PMC11484545, DOI: 10.1523/jneurosci.0171-24.2024.

Höhn C, Hahn M, Lendner J, Hoedlmoser K. Spectral Slope and Lempel–Ziv Complexity as Robust Markers of Brain States during Sleep and Wakefulness. ENeuro 2024, 11: eneuro.0259-23.2024. PMID: 38471778, PMCID: PMC10978822, DOI: 10.1523/eneuro.0259-23.2024.

Lendner J, Niethard N, Mander B, van Schalkwijk F, Schuh-Hofer S, Schmidt H, Knight R, Born J, Walker M, Lin J, Helfrich R. Human REM sleep recalibrates neural activity in support of memory formation. Science Advances 2023, 9: eadj1895. PMID: 37624898, PMCID: PMC10456851, DOI: 10.1126/sciadv.adj1895.

Lendner J, Helfrich R. How Can I Run Sleep and Anesthesia Studies with Intracranial EEG? Studies In Neuroscience, Psychology And Behavioral Economics 2023, 315-330. DOI: 10.1007/978-3-031-20910-9_20.

van Schalkwijk F, Weber J, Hahn M, Lendner J, Inostroza M, Lin J, Helfrich R. An evolutionary conserved division-of-labor between archicortical and neocortical ripples organizes information transfer during sleep. Progress In Neurobiology 2023, 227: 102485. PMID: 37353109, DOI: 10.1016/j.pneurobio.2023.102485.

Lendner J, Harler U, Daume J, Engel A, Zöllner C, Schneider T, Fischer M. Oscillatory and aperiodic neuronal activity in working memory following anesthesia. Clinical Neurophysiology 2023, 150: 79-88. PMID: 37028144, DOI: 10.1016/j.clinph.2023.03.005.

Toker D, Pappas I, Lendner J, Frohlich J, Mateos D, Muthukumaraswamy S, Carhart-Harris R, Paff M, Vespa P, Monti M, Sommer F, Knight R, D’Esposito M. Consciousness is supported by near-critical slow cortical electrodynamics. Proceedings Of The National Academy Of Sciences Of The United States Of America 2022, 119: e2024455119. PMID: 35145021, PMCID: PMC8851554, DOI: 10.1073/pnas.2024455119.

Helfrich R, Lendner J, Knight R. Aperiodic sleep networks promote memory consolidation. Trends In Cognitive Sciences 2021, 25: 648-659. PMID: 34127388, PMCID: PMC9017392, DOI: 10.1016/j.tics.2021.04.009.

Lendner J. What Is Anesthesia? Frontiers For Young Minds 2021, 9: 524571. DOI: 10.3389/frym.2021.524571.

Lendner J, Helfrich R, Mander B, Romundstad L, Lin J, Walker M, Larsson P, Knight R. An electrophysiological marker of arousal level in humans. ELife 2020, 9: e55092. PMID: 32720644, PMCID: PMC7394547, DOI: 10.7554/elife.55092.

Helfrich R, Lendner J, Mander B, Guillen H, Paff M, Mnatsakanyan L, Vadera S, Walker M, Lin J, Knight R. Bidirectional prefrontal-hippocampal dynamics organize information transfer during sleep in humans. Nature Communications 2019, 10: 3572. PMID: 31395890, PMCID: PMC6687745, DOI: 10.1038/s41467-019-11444-x.

Radtke F, Franck M, Lendner J, Krüger S, Wernecke K, Spies C. Monitoring depth of anaesthesia in a randomized trial decreases the rate of postoperative delirium but not postoperative cognitive dysfunction. British Journal Of Anaesthesia 2013, 110: i98-i105. PMID: 23539235, DOI: 10.1093/bja/aet055.