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Recent suggestions on the involvement of the spatial frequency of visual stimuli in the hemispheric lateralization were investigated by recording steady-state evoked potentials in two groups of subjects: five right-handers and five left-handers. Sinusoidal gratings at spatial frequency of 0.5, 1, 3, 4, 6, 8, 10, 12 or 16 cpd were phase reversed at 4 Hz or(More)
Steady-state evoked potentials were recorded in eight adult subjects from occipital and temporal leads of both hemispheres to investigate the effect of temporal frequency on the hemispheric specialization for basic visual information. A 3 cycles deg-1 grating was phase-reversed at different temporal frequencies (from 4 to 18 Hz), and the frequency spectrum(More)
In order to enhance the effect of spatial frequency on the hemispheric asymmetry of visual evoked potentials (VEP), the response amplitudes to ON-OFF modulated gratings were compared with the responses to pattern reversal stimulation. Sinusoidal gratings of different spatial frequencies were presented to six righthanders. VEPs were recorded from temporal(More)
This study presents two distinct effects produced by manipulation of the background illumination on the directional sensitivity to colour- and orientation-carried motion. The two motion percepts were produced with two of a class of stimuli extensively used by the first and last authors in apparent-motion studies. The stimuli were designed to produce motion(More)
INTRODUCTION Diagnostic imaging techniques, at present especially computed tomography (CT), have become the most important noninvasive method for the study of mummies because they enable high resolution images and three-dimensional reconstructions without damaging the mummified subject. We present a sarcophagus with a mummy hidden inside that was acquired(More)
A single-eye irradiation of 10 Gy (0.8 Gy. min-1) induces impairments of the electrical responses of the rabbit retina in dark adaptation. These are associated with reversible alteration of the photoreceptors and the preganglionic neurons and a disturbance of all the mechanisms of adaptation. Possible relationships between these functional alterations and(More)
UNLABELLED The olfactory and gustatory stimulations with NaCl (10(-5)-10(-2) M/1) bring about certain typical modifications of the preoptic cells activity in the case of "Parr" and "Parr smolt". The "on" or "off" or "on and off" effects are very marked. Unlike the "Smolt" stage is accompanied by an important decrease of the preoptic cells activity,(More)
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