Elio García-Austt

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The discharge patterns and layer distribution of entorhinal cortex (EC) units were investigated in paralysed and locally anesthetized rats injected with physostigmine in order to induce theta (θ) rhythm. Entorhinal unit activity and field potentials were recorded simultaneously with the same micropipette. Hippocampal CA1 θ rhythm was used as reference.(More)
Dorsal hippocampal theta rhythm (Θ) and extracellular unit activity from CA1 pyramidal layer were recorded in awake guinea pigs, both during standing and during walking on a conveyor belt at increasing speeds. Amplitude, frequency and rhythmicity of Θ increased linearly with the movement speed. In this preparation we found the same three types of unit(More)
The activity from 55 septohippocampal neuron pairs was examined in rats anesthetized with urethane. In addition to the statistical characterization of the firing patterns of the recorded units, the functional interactions between pairs of neurons and between neurons and hippocampal theta (theta) waves were investigated with cross-correlation techniques.(More)
The hippocampal EEG and the transmembrane potential of CA1-CA3 hippocampal pyramids were recorded in curarized and urethanized rats. Pyramids were identified by antidromic driving and intracellular staining with Lucifer yellow. During theta-rhythm most pyramids showed 10-20 mV sustained depolarizations and potential oscillations either consisting of 5-10 mV(More)
The effects of intracellular Cl- diffusion and hyperpolarizing current pulses on inhibitory postsynaptic potentials (IPSPs) and the transmembrane theta rhythm of CA1-CA3 pyramidal neurons were tested in urethanized and curarized rats. Cl- diffusion and hyperpolarizing currents decreased the amplitude of IPSPs evoked by fornix stimulation without modifying(More)
The membrane potential of 45 CA1-CA3 hippocampal pyramidal cells was recorded in curarized and urethanized rats. Two slow spike types were observed together with the usual Na+ type action potential. Slow spikes were termed HTS and LTS because they were essentially identical to the high and low threshold Ca2+ spikes observed in vitro and probably represent(More)
The activity of 72 neurons recorded in the reticularis pontis oralis nucleus (RPO) was examined in anesthetized and curarized rats during hippocampal theta (θ) rhythm elicited by either sensory stimulation or carbachol microinjections. During hippocampal θ rhythm evoked by sensory stimulation, 63.9% of RPO neurons increased their discharge rate while the(More)
Transmembrane potentials from medial septal and diagonal band of Broca (MS-DBB) neurons and hippocampal field activity were recorded in curarized and urethanized rats. MS-DBB cells were studied during large amplitude irregular activity and during hippocampal θ rhythm, elicited by either sensory (i.e. stroking the fur on the animal's back) or electrical(More)
Hippocampal theta rhythm and phasic events (i.e., vibrissa, body and ocular movements and ponto-geniculo-occipital (PGO) spikes) were recorded in rats and cats during paradoxical sleep (PS). Single pulse stimulation of some afferent structures (i.e., medial septum, mesencephalic reticular formation and entorhinal cortex) were performed during PS.(More)
Single neuron activity in the pulvinar (Pu) was recorded in unanesthetized Macaca irus to investigate the sensory-motor role of this nucleus. A cylinder cemented to the skull allowed microelectrode penetrations. The head was immobilized during recording. Animals were trained to move a lever (push-pull). Electromyographs (EMGs) of several limb muscles were(More)