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Accurate estimation of spike train from calcium (Ca2+) fluorescence signals is challenging owing to significant fluctuations of fluorescence level. This paper proposes a non-model-based approach for spike train inference using group delay (GD) analysis. It primarily exploits the property that change in Ca2+ fluorescence corresponding to a spike has a notable onset location followed by a decaying transient...
Hemodynamic signals enable functional brain imaging, yet their origin and the mechanism by which they report neural activity are unresolved. Astrocytes are a major class of nonneuronal cell in the brain that receive inputs at excitatory synapses and link to the vasculature via endfeet on capillaries. Recent work utilizing in vivo high resolution cellular imaging of calcium signals in astrocytes and...
The use of two-photon microscopy allows for imaging of deep neural tissue in vivo. This paper examines frequency-based analysis to two-photon calcium fluorescence images with the goal of deriving smooth tuning curves. We present a multifrequency analysis approach for improved extraction of calcium responses in episodic stimulation experiments, that is, when the stimulus is applied for a number of...
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