Learn More
Weak sinusoidal electric fields modify the calcium efflux from freshly isolated chick and cat cerebral tissues bathed in Ringer's solution, at 36 degrees. Following incubation (30 min) with radioactive calcium (45Ca2+), each sample, immersed in fresh solution, was exposed for 20 min to fields at 1, 6, 16, 32, or 75 Hz, with electric gradients of 5, 10, 56,(More)
The amplitude of population spikes in the CA1 cell layer of rat hippocampal slices was transiently altered during stimulation of the tissue with DC and sinusoidal extracellular electric fields parallel to the dendrosomatic axis of the CA1 pyramidal neurons. Field threshold was about 50 mV/cm in the tissue. Independently, long-lasting (min) increases in(More)
Aim of study (according to author) To study the effect of exposures to low intensity, very high frequency (VHF) electrical fields, amplitude modulated at biological frequencies on untrained and conditioned cats. Background/further details: A series of cats was operantly trained to produce specific transient brain rhythms following periodic presentations of(More)
A catalogue record for this book is available from the British Library Library of Congress Cataloguing in Publication data Self-organized biological dynamics and nonlinear control: toward understanding complexity, chaos and emergent function in living systems/edited by Jan Walleczek. p. cm.
Calcium (45Ca2+) efflux was studied from preloaded cortex in cats immobilized under local anesthesia, and exposed to a 3.0-mW/cm2 450-MHz field, sinusoidally amplitude modulated at 16 Hz modulation depth 85%). Tissue dosimetry showed a field of 33 V/m in the interhemispheric fissure (rate of energy deposition 0.29 W/kg). Field exposure lasted 60 min. By(More)
Several studies have indicated that weak, extremely-low-frequency (ELF; 1-100 Hz) magnetic fields affect brain electrical activity and memory processes in man and laboratory animals. Our studies sought to determine whether ELF magnetic fields could couple directly with brain tissue and affect neuronal activity in vitro. We used rat hippocampal slices to(More)
The influence of extracellular sinusoidal electric fields on the amplitude of population spikes evoked by single test pulses in excitatory pathways to CA1 pyramidal neurons was studied in rat hippocampal slices. The fields in the tissue were of the order of EEG gradients. Stimulation at 5 Hz, a frequency representative of hippocampal theta activity, was(More)
Electrical stimulation with radiofrequency fields amplitude-modulated at brain wave frequencies increased 45Ca2+ efflux from isolated chicken cerebral tissue. The response was not sensitive to variations of the calcium concentration (0-4.16 mM) in the bathing solution but was enhanced by addition of H+ (0.108 mM HCl) and inhibited in the absence of normal(More)
Rat hippocampal slices in 0, 0.25, 1.5 or 3 mM penicillin were exposed briefly to extracellular sinusoidal electric fields (20 s, 5 and 60 Hz, 20-40 mV/cm in tissue). Fields induced long-term (min) changes in population spike amplitudes in the CA1 cell layer. Post-field effects included both depression of strongly epileptiform responses and potentiation of(More)