A model of order-selectivity based on dynamic changes in the balance of excitation and inhibition produced by short-term synaptic plasticity
| Autor: | Vishwa Goudar, Dean V. Buonomano |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Sensory processing
Physiology medicine.medical_treatment Models Neurological Action Potentials Nonsynaptic plasticity Sensory system Sensory Processing Synaptic Transmission Speech discrimination Metaplasticity Neuroplasticity medicine Computer Simulation alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid gamma-Aminobutyric Acid Auditory Cortex Neurons Neuronal Plasticity Synaptic scaling General Neuroscience Neural Inhibition Inhibitory Postsynaptic Potentials Nonlinear Dynamics Synapses Synaptic plasticity Auditory Perception Psychology Neuroscience |
| Zdroj: | Journal of Neurophysiology. 113:509-523 |
| ISSN: | 1522-1598 0022-3077 |
| Popis: | Determining the order of sensory events separated by a few hundred milliseconds is critical to many forms of sensory processing, including vocalization and speech discrimination. Although many experimental studies have recorded from auditory order-sensitive and order-selective neurons, the underlying mechanisms are poorly understood. Here we demonstrate that universal properties of cortical synapses—short-term synaptic plasticity of excitatory and inhibitory synapses—are well suited for the generation of order-selective neural responses. Using computational models of canonical disynaptic circuits, we show that the dynamic changes in the balance of excitation and inhibition imposed by short-term plasticity lead to the generation of order-selective responses. Parametric analyses predict that among the forms of short-term plasticity expressed at excitatory-to-excitatory, excitatory-to-inhibitory, and inhibitory-to-excitatory synapses, the single most important contributor to order-selectivity is the paired-pulse depression of inhibitory postsynaptic potentials (IPSPs). A topographic model of the auditory cortex that incorporates short-term plasticity accounts for both context-dependent suppression and enhancement in response to paired tones. Together these results provide a framework to account for an important computational problem based on ubiquitous synaptic properties that did not yet have a clearly established computational function. Additionally, these studies suggest that disynaptic circuits represent a fundamental computational unit that is capable of processing both spatial and temporal information. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|