The synaptic mechanisms underlying amino acid-mediated excitation in the lamprey spinal cord have been investigated. Fine stimulating electrodes were used to stimulate single axons in the spinal cord and evoke unitary EPSPs in lamprey motoneurons and one type of premotor interneuron, the CC interneuron. Three types of EPSP, distinguished by their time course and sensitivity to amino acid antago...

We used event-related potentials (ERPs) and gamma band oscillatory responses (GBRs) to examine whether intermodal attention operates early in the auditory, visual, and tactile modalities. To control for the effects of spatial attention, we spatially coregistered all stimuli and varied the attended modality across counterbalanced blocks in an intermodal selection task. In each block, participant...

The action of halothane on sinoatrial, ventricular, and Purkinje fibers was studied by means of intracellular microelectrodes. Rabbit atrial fibers were not very sensitive to even high (2%) concentrations of halothane. Sheep Purkinje fibers showed a significant hyperpolarization from 82 mv to 87 mv, a marked shortening of the duration of the action potential from 370 msec to 233 msec, and a dim...

Covert face recognition in neurologically intact participants was investigated with the use of very brief stimulus presentation to prevent awareness of the stimulus. In Experiment 1, skin conductance response (SCR) to photographs of celebrity and unfamiliar faces was recorded; the faces were displayed for 220 msec and for 17 msec in a within-participants design. SCR to faces presented for 220 m...

introduction: recent studies have shown acute cardioprotective effects of cyclosporine. the aim of the present study was to determine the protective role of cyclosporine on the model simulated the rotational nodal arrhythmia (avnrt) by using extracellular field potential recordings of isolated atrioventricular-node (av-node) of rabbit. methods: this study was performed on isolated double-perfus...

INTRODUCTION The incidence of atrial fibrillation is greater in men than in women, but the reasons for this gender difference are unclear. The purpose of this study was to evaluate the effects of gender on the atrial electrophysiologic effects of rapid atrial pacing and an increase in atrial pressure. METHODS AND RESULTS Right atrial pressure and effective refractory period (ERP) were measure...

Electrocardiograms (ECG), McFee vectorcardiograms (VCG), and ventricular activation data were collected from 25 anesthetized dogs before, immediately after, and 4 weeks after surgically induced discrete left anterior divisional block. Left anterior divisional block resulted in minor ECG changes: small S waves developed in leads II, HI, and aVF and the QRS complex was prolonged 5-15 msec (mean 9...

His bundle electrograms (H) were recorded in 27 patients with PR prolongation and intraventricular conduction disturbances. The PR interval was subdivided into P-H (normal 80-140 msec), a measure of atrioventricular (A-V) conduction, and H-Q (normal 35-55 msec), a measure of intraventricular conduction. In 12 patients with left bundle-branch block (LBBB), P-H varied from 115-410 msec (mean 173 ...

Abstract Remote sensing (RS) applications have become an important tool for the rapid evaluation of water resources. This paper deals with the utilization of RS data as the main input in an integrated approach for groundwater targeting. The Mulug Taluk, with an areal extent of 3200 km, is one of the poor taluks in the Warangal District, Andhra Pradesh, India. A hydrogeomorphological study based...