Models of visual cortex

Effects of visual deprivation on synaptic plasticity of visual cortex

  TBS (Theta Burst Stimulation) and PBs (Primed Bursts) are among effective tetanic stimulations for induction of LTP in hippocampus. Recent studies have indicated that TBS is effective in LTP induction in layer III synapses of neocortex, only if applied to layer IV. However, the possibility of neocortical LTP induction using PBs, has not yet been investigated. Sensory deprivation greatly influ...

An fMRI study of human visual cortex in response to spatiotemporal properties of visual stimuli

  ABSTRACT  Background: The brain response to temporal frequencies (TF) has been already reported, but with no study reported for different TF with respect to various spatial frequencies (SF).  Materials and Methods: fMRI was performed by 1.5T GE-system in 14 volunteers during checkerboard, with TFs of 4, 6, 8 and 10Hz in low and high SFs of 0.5 and 8cpd.  Results: Average percentage BOLD signa...

Graphical Models of the Visual Cortex

Post graduate school, three chance encounters reshaped my academic career, and all three involved Judea Pearl directly or otherwise. The first encounter was meeting Judea on a visit to the UCLA campus at a time when I was developing what I called temporal Bayesian networks and would later be called dynamic belief networks (an unfortunate choice of names for reasons I'll get to shortly). Judea w...

Functional Models of Mouse Visual Cortex

We develop machine learning methods to decipher the neural code that links perception with the firing of neurons in the cerebral cortex. We deploy Bayesian graphical models for holistic neuron data analysis to provide a framework for understanding the neural circuitry, which is unattainable with current single neuron methods. The proposed models are data-driven and capture the probabilistic con...

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