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Excitatory cortical neurons form fine-scale networks of precisely interconnected neurons. Here we tested whether inhibitory cortical neurons in rat visual cortex might also be connected with fine-scale specificity. Using paired intracellular recordings and cross-correlation analyses of photostimulation-evoked synaptic currents, we found that fast-spiking(More)
The specificity of cortical neuron connections creates columns of functionally similar neurons spanning from the pia to the white matter. Here we investigate whether there is an additional, finer level of specificity that creates subnetworks of excitatory neurons within functional columns. We tested for fine-scale specificity of connections to cortical(More)
Telencephalic inhibitory neurons originate in the ganglionic eminences and migrate to the cerebral cortex following a tangential trajectory, before they differentiate and integrate within the local circuitry. Current studies of interneuron development and function benefit from the use of knock-out and transgenic mice, whereas none take advantage of the(More)
This paper proposes a new unsupervised learning method for obtaining English part-of-specch(POS) disambiguation rules which would improve thc accuracy of a POS tagger. This method has been implemented in the experimental system APRAS (Automatic POS Rule Acquisition System), which extracts POS disambiguation rules fl'om plain text corpora by utilizing(More)
In order to increase parsing efficiency in a real-time on-line translation system interfaced with a keyboard conversation program, we have developed a version of the ATN formalism with a look-ahead function. By permitting future input to be scanned, arcs can be reordered or suppressed. Various mechanisms utilizing this capability are presented.
Excitatory cortical neurons form fine-scale networks of precisely interconnected neurons. Here we tested whether inhibitory cortical neurons in rat visual cortex might also be connected with fine-scale specificity. Using paired intracellular recordings and cross-correlation analyses of photostimulation-evoked synaptic currents, we found that fast-spiking(More)
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