Unitary recordings in freely-moving pulse weakly electric fish suggest spike timing encoding of electrosensory signals

Random Walks for Spike-Timing Dependent Plasticity

Random walk methods are used to calculate the moments of negative image equilibrium distributions in synaptic weight dynamics governed by spike-timing dependent plasticity (STDP). The neural architecture of the model is based on the electrosensory lateral line lobe (ELL) of mormyrid electric fish, which forms a negative image of the reafferent signal from the fish's own electric discharge to optimize detection of sensory electric fields. Of particular behavioral importance to the fish is the variance of the equilibrium postsynaptic potential in the presence of noise, which is determined by the…

Noninvasive Realistic Stimulation/Recording of Freely Swimming Weakly Electric Fish: Movement Detection and Discharge Entropy to Infer Fish Behavior

Weakly electric fish are unique models in Neuroscience allowing experimentalists to access, with non invasive techniques,a central nervous system generated spatio-temporal electric pattern of pulses with roles in at least two complex and not yet completely understood abilities:electrocommunication and electrolocation. We developed an apparatus to allow realistic stimulation and simultaneous recording of electric pulses in freely moving Gymnotus carapo for very long periods-several days. Voltage time series from a 3dimensional array of sensitive dipoles that detects electric field in several po…

电鱼对可预测刺激的自适应追踪建模

Modeling Adaptive Tracking of Predictable Stimuli in Electric Fish

本文针对弱电鱼追踪振荡庇护所时高频相位滞后增大、增益下降的非线性行为，提出将自适应频率辨识与内模原理（IMP）闭环系统相结合，并证明其追踪误差指数收敛至理想系统，仿真还复现了宽频范围内的 Bode 图，为自适应感觉运动控制提供了理论框架。