Positive and biphasic extracellular waveforms correspond to return currents and axonal spikes
Positive and biphasic extracellular waveforms correspond to return currents and axonal spikes
Abstract Multiple biophysical mechanisms may generate non-negative extracellular waveforms during action potentials, but the origin and prevalence of positive spikes and biphasic spikes in the intact brain are unknown. Using extracellular recordings from densely-connected cortical networks in freely-moving mice, we find that a tenth of the waveforms are non-negative. Positive phases of non-negative spikes occur in synchrony or just before wider same-unit negative spikes. Narrow positive spikes occur in isolation in the white matter. Isolated biphasic spikes are narrower than negative spikes, occurring right after spikes of verified inhibitory units. In CA1, units with dominant non-negative spikes exhibit place fields, phase precession, and phase-locking to ripples. Thus, near-somatic narrow positive extracellular potentials correspond to return currents, and isolated non-negative spikes correspond to axonal potentials. Identifying non-negative extracellular waveforms that correspond to non-somatic compartments during spikes can enhance the understanding of physiological and pathological neural mechanisms in intact animals.
Gattegno Roni、Someck Shirly、Levi Amir、Spivak Lidor、Sloin Hadas E.、Stark Eran
Sagol School of Neuroscience, Tel Aviv UniversitySagol School of Neuroscience, Tel Aviv University||Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv UniversitySagol School of Neuroscience, Tel Aviv University||Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv UniversitySagol School of Neuroscience, Tel Aviv University||Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv UniversitySagol School of Neuroscience, Tel Aviv University||Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv UniversitySagol School of Neuroscience, Tel Aviv University||Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University
生物物理学生理学生物科学现状、生物科学发展
Gattegno Roni,Someck Shirly,Levi Amir,Spivak Lidor,Sloin Hadas E.,Stark Eran.Positive and biphasic extracellular waveforms correspond to return currents and axonal spikes[EB/OL].(2025-03-28)[2025-06-06].https://www.biorxiv.org/content/10.1101/2023.03.24.534099.点此复制
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