Biophysics-inspired spike rate adaptation for computationally efficient phenomenological nerve modeling
Hearing Research, vol. 447, pp. 109011
Abstract
This study introduces and evaluates the PHAST+ model, part of a computational framework designed to simulate the behavior of auditory nerve fibers in response to the electrical stimulation from a cochlear implant. PHAST+ incorporates a highly efficient method for calculating accommodation and adaptation, making it particularly suited for simulations over extended stimulus durations. The proposed method uses a leaky integrator inspired by classic biophysical nerve models. Through evaluation against single-fiber animal data, our findings demonstrate the model's effectiveness across various stimuli, including short pulse trains with variable amplitudes and rates. Notably, the PHAST+ model performs better than its predecessor, PHAST (a phenomenological model by van Gendt et al.), particularly in simulations of prolonged neural responses. While PHAST+ is optimized primarily on spike rate decay, it shows good behavior on several other neural measures, such as vector strength and degree of adaptation. The future implications of this research are promising. PHAST+ drastically reduces the computational burden to allow the real-time simulation of neural behavior over extended periods, opening the door to future simulations of psychophysical experiments and multi-electrode stimuli for evaluating novel speech-coding strategies for cochlear implants.
Authors 6
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Affiliation as printed
Leiden Institute of Advanced Computer Science, Niels Bohrweg 1, Leiden, Netherlands
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Leiden University Medical Center
Affiliation as printed
Department of Otorhinolaryngology, Leiden University Medical Center, Albinusdreef 2, Leiden, Netherlands
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Leiden University Medical Center
Affiliation as printed
Department of Otorhinolaryngology, Leiden University Medical Center, Albinusdreef 2, Leiden, Netherlands
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Affiliation as printed
Leiden Institute of Advanced Computer Science, Niels Bohrweg 1, Leiden, Netherlands
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Affiliation as printed
Leiden Institute of Advanced Computer Science, Niels Bohrweg 1, Leiden, Netherlands
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Johan H. M. Frijns Aachen
Leiden University Medical Center
Affiliation as printed
Department of Otorhinolaryngology, Leiden University Medical Center, Albinusdreef 2, Leiden, Netherlands; Leiden Institute for Brain and Cognition, Wassenaarseweg 52, Leiden, Netherlands. Electronic address: j.h.m.frijns@lumc.nl
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