The visual cortex as a crystal

The visual cortex as a crystal

A theory of pattern formation in primary visual cortex (V1) is presented that takes into account its crystalline-like structure. The cortex is partitioned into fundamental domains or hypercolumns of a lattice describing the distribution of singularities or pinwheels in the orientation preference map. Each hypercolumn is modelled as a network of orientation and spatial frequency selective cells ...

The Visual Cortex as a Hierarchical Predictor

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...

The Relation between Visual Associations of a Random Fixed Cardboard Piece and Introversion-Extroversion as well as the Level of Creativity in a Group of Visual Artists

The mental visual association of a vague and shapeless form may happen for anybody but only an artist can make an objective form out of it through drawing.  This article studies the relationship between the visual associations of a random cardboard piece as the pattern drawn by the artists and the type of their personality as well as the level of their creativity. The samples consist of 80 arti...

Effects of visual deprivation on epileptic activity in mature rat visual cortex

  Effects of visual deprivation on the induction of epileptiform activity were studied in layer II/III of mature rat primary visual cortex. Field potentials were evoked by stimulation of layer IV in slices from control and dark-reared (OR) rats. Picrotoxin (PTX)-induced epileptic activity was characterized by spontaneous and evoked epileptic field potentials (EFPs). The results showed that OR s...