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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 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 lateral septum receives the most important afferents from the hippocampus, has been proposed to contribute to theta (theta) rhythm generation. Our aim was to study the membrane and circuital properties of lateral septum neurons and their relationship with hippocampal rhythms. Extra- and intracellular recordings (n=81) were obtained in(More)
To compare the ongoing electrical activity in possibly homologous structures of reptiles and mammals, the electrographic activity (micro-EEG) from major parts of the cortex of unanesthetized turtles (Pseudemys) and geckos (Gekko) was recorded with and without acute and chronic stimuli, physostigmine and atropine. Electrodes were placed in the medial cortex(More)
Unit activity was recorded from the pulvinar nucleus (Pu) in human patients undergoing stereotaxic surgery. Thirty-six units (12 isolated and 12 pairs recorded with the same microelectrode) with a signal-to-noise ratio greater than 5, a stable amplitude, and a sustained discharge rate for more than 1 min, were selected for processing. The following(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)
Extracellular cell activity was recorded in the intermediate and posterior subdivisions of the nucleus basalis of Meynert (NBM) of awake monkeys to determine cell characteristics and the motor and sensory participation. Animals were trained to move a lever by elbow flexion-extensions to receive a reward. Cell activity was recorded when the animal was at(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)
Responses of substantia nigra (SN) pars compacta (SNc) and reticulata (SNr) neurons to sensory stimulation and movement were investigated in awake Macaca fascicularis. Concern was assigned to polysensory and sensory/motor convergence on the same cell, which were found in 12% and 9% of the neurons, respectively. Others were modality specific (35%) or(More)