Abstract
The axons exhibit depolarizing and hyperpolarizing afterpotentials, which result in complicated patterns of recovery cycle and influence the activation of subsequent action potential (AP) with deep brain stimulation (DBS). Our objective is to examine the spike initiation at axonal afterpotentials. We use biophysical models to simulate the afterpotentials and apply two-pulse conditioning-test paradigm to measure the stimulus threshold in recovery cycle. We analyze the phase plane portraits and interactions of ionic currents at spike threshold to determine the spike initiating dynamics associated with the recovery cycle. We show that the afterpotentials alter the net current at voltage threshold of subsequent AP, which results in the changes in spike threshold. The difference between spike threshold and afterpotentials determines the stimulus threshold for evoking subsequent AP, which governs the recovery cycle pattern. Our simulations provide a biophysical basis of the spike initiation at the afterpotentials, which is important for interpreting the activity-dependent modulations of axonal excitability. The predictions should be considered when understanding the frequency-dependent firing patterns in the axon with DBS.
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Yi, G., Zhao, Q. Spike initiating dynamics at axonal afterpotentials: model-based mechanisms of the recovery cycle. Nonlinear Dyn 111, 10487–10504 (2023). https://doi.org/10.1007/s11071-023-08362-5
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DOI: https://doi.org/10.1007/s11071-023-08362-5