Linear transformation of thalamocortical input by intracortical excitation

Spectral integration in primary auditory cortex attributable to temporally precise convergence of thalamocortical and intracortical input.

Primary sensory cortex integrates sensory information from afferent feedforward thalamocortical projection systems and convergent intracortical microcircuits. Both input systems have been demonstrated to provide different aspects of sensory information. Here we have used high-density recordings of laminar current source density (CSD) distributions in primary auditory cortex of Mongolian gerbils...

Contrast-invariant orientation tuning in cat visual cortex: thalamocortical input tuning and correlation-based intracortical connectivity.

The origin of orientation selectivity in visual cortical responses is a central problem for understanding cerebral cortical circuitry. In cats, many experiments suggest that orientation selectivity arises from the arrangement of lateral geniculate nucleus (LGN) afferents to layer 4 simple cells. However, this explanation is not sufficient to account for the contrast invariance of orientation tu...

Contrast - Invariant Orientation Tuning in Cat VisualCortex : Thalamocortical Input Tuning andCorrelation - Based Intracortical

Tonically Balancing Intracortical Excitation and Inhibition by GABAergic Gliotransmission

For sensory cortices to respond reliably to feature stimuli, the balancing of neuronal excitation and inhibition is crucial. A typical example might be the balancing of phasic excitation within cell assemblies and phasic inhibition between cell assemblies. The former controls the gain of and the latter the tuning of neuronal responses. A change in ambient GABA concentration might affect the dyn...

Intracortical vs. thalamocortical processing of spatial working memory

Working memory processes contain not only maintenance but manipulation of the working memory contents. The system of the mediodorsal (MD) nucleus and the prefrontal cortex is considered to contribute to some aspects of the working memory processes. This article studies computationally the characteristics of the integrated cortical and thalamocortical system. The model circuit is operated in the...