... parameters of vigilance in healthy volunteers and to provide further evidence of the behavioral (subjective sleepiness, reaction time) and electrophysiological (P300 and spectral characteristics) responses to light. The results show that the short-wavelength light condition (455 nm) was found to be most...

... applies for the wake state which also comprises distinct global functional states (called vigilance stages). However, various terms and concepts have been introduced describing different aspects of wakefulness, and accordingly several methods of assessment exist, e.g. sleep laboratory assessments...

...-depressive illness'). According to the vigilance regulation model, the regulation of brain arousal (referred to as ‘vigilance') when assessed via EEG is an emerging biomarker linked to the pathogenesis of manic and depressive episodes. On this basis, the present study aimed to assess whether carriers of BD...

...Sebastian Olbrich; Christian Sander; Juliane Minkwitz; Tobias Chittka; Roland Mergl; Ulrich Hegerl; Hubertus Himmerich Background/Aim: Recently, a framework has been presented that links vigilance regulation, i.e. tonic brain arousal, with clinical symptoms of affective disorders. Against...

... opposite effects of the two drugs on subjective alertness, suggesting opposite effects on vigilance. Opposite effects on memory were not established. This demonstrates that changes in alertness do not run in parallel with changes in memory. A scatter diagram, however, suggests a small effect of alertness...

..., a possible therapeutic role is suggested by the beneficial effects in patients at risk of hypoventilation-associated disorders. Corticotropin-releasing hormone Thyrotropin-releasing hormone Blood pressure Respiration Sleep Vigilance 22 2 2008 © 1993 S. Karger AG, Basel 1993...

... facilitation. After intake of buspirone, there were no effects of altertness and vigilance, on psychomotor performance and on memory. One week later, a small memory decrement was noticed for verbal material, which was considered as a sign of anterograde amnesia. These results indicate that effects...

...Milos Matousek The sedative or excitatory effects of drugs are difficult to evaluate in patients with depression, where sleep disturbances and tiredness in the daytime belong to the clinical manifestations of the psychiatric disorder. A refined method of vigilance measurement, based on the EEG...

..., 60, 90 min, 2, 3, 5, 6, 7, 8, 9, 10 and 24 h following intake whereas a computerized assessment of vigilance (reaction time) was performed before intake, 15, 30, 60 min, 2, 3, 6, 8, 10 h following intake. Subjects rated themselves significantly more feeble, clumsy, lethargic, and incompetent...

.... Difficulty was varied through increasing the rate of auditorily presented numerical stimuli. Also examined were EEG alpha correlates with measures of performance anxiety, subjective difficulty, loss of vigilance, confusion, the tendency to rely on a guessing strategy and performance. While increasing task...

... a battery of tasks measuring visual search, division of attention, tracking, critical tracking, rate of information processing, and vigilance. Amitriptyline, 50 mg, produced impairment on the vigilance task, the divided attention task and the critical tracking task. In addition, episodes of extended...

... effects Vigilance Ncuropsychobiology 18: 155-159 (1987) © 1987 S. Kargcr AG, Basel 0302-282X/87/O183-Ol55$2.75/0 Segmentation of the EEG by Minimization of the Total Gain in Information E. Reschenhofer, R. Vollmer, M. Deisller Institute of Econometrics and Operations Research, University of Technology...

...Milos Matousek A vigilance measurement based on EEG spectra was employed to supplement the clinical data. In an experimental situation when the patient was left undisturbed after a standard stimulation, four typical patterns were observed. Besides the normal profile, a ‘somnolent pattern...

...K. Wesnes; D.M. Warburton Signal detection analysis was used to examine the effects of scopolamine on a visual vigilance task. A group of non-smokers performed the 60-min task on three separate occasions, receiving a different dose of scopolamine each time. Scopolamine significantly lowered...

...A. Glatt; T. Duerst; B. Mueller; H. Demieville A test procedure, inducing a defined state of vigilance in rats, has been investigated to ascertain its usefulness for EEG monitoring of the effects of drugs. In order to prevent spontaneous fluctuations in the level of vigilance, rats were trained...

... frequency and the centroid of alpha activity. These spontaneously occurring CNS changes were either attenuated by oxiracetam or even reversed, which suggests vigilance-improving properties of the drug. 19 2 2008 © 1985 S. Karger AG, Basel 1985 Copyright / Drug Dosage / Disclaimer Copyright...

..., instructions or products referred to in the content or advertisements. CNS Thyroid hormone Flicker fusion Vigilance Psychomotor performance Hypothyroidism Neuropsychobiology 5: 274 281 (1979) Cerebral Function in Hypothyroid Patients A Study of the Vigilance Level in Patients with Hypothyroidism...

... Research Section of Psychophysiology, Clarke Institute of Psychiatry, Toronto, Ont. Key Words. Thermoregulation Skin temperature Body temperature Ultradian biological rhythms Vigilance Sleep Abstract. 53 healthy persons were monitored for skin temperature by a Hardy dermal radiometer every 60 sec...

... Spectral analysis Visual perception Autocorrelation Vigilance Reaction time Information processing Ncuropsychobiology 4: 93-98 (1978) An Ultradian Rhythm of Reaction Time Measurements in Man J.W. Lovett Doust, W.D. Payne and I. Podnieks Research Section of Psychophysiology, and Computer Service...

...J.W. Lovett Doust; I. Podnieks Regular repetition of one monitor of sensory perception and another of psychomotor perception revealed similar frequency and amplitude aspects of spontaneous endogenous free-running cycles of perception and others of vigilance. The ultradian periodicities...