Showing papers on "Delta wave published in 1978"
TL;DR: Significant differences in nocturnal sleep patterns from matched controls initially after infarction included greater wakefulness, low REM sleep per cent, long REM latency, fewer REM periods, more awakenings, more stage shifts and decreased sleep efficiency.
153 citations
TL;DR: The findings of PANV35 indicate that period and amplitude analysis of NREM sleep yields measures which are both sensitive and stable.
130 citations
TL;DR: Results suggest that a disturbance in cholinergic input to the cortex might be responsible for delta waves in the EEG, with surface-positive delta waves related to events associated with excitation of cortical neurons, while surface-negative delta waves are related to a decreased probability of unit firing suggesting the possibility of inhibition.
67 citations
TL;DR: In this paper, polygraphic sleep recordings were obtained from four patients with progressive supranuclear palsy (PSP), a disease which produces degenerative changes in the pontine and mesencephalic tegmentum, globus pallidus, dentate nuclei of the cerebellum and nuclei at mesodiencephalic junction.
63 citations
TL;DR: It is hypothesize that persistent wakefulness of adequately long duration prior to the onset of sleep is necessary for such differential distribution in dogs as well as in man.
25 citations
TL;DR: The combination of the short sleep EEG following 24h of sleep deprivation with subsequent use of the additional provocative methods of hyperventilation, photostimulation and hydration yielded, in all, new information in 50% of the patients.
Abstract: One hundred and eighty-five EEGs recorded after deprivation of sleep for 24h were evaluated. Valuable diagnostic information was found in 59% of the EEG recordings; 24% of the EEGs contained seizure activity. The duration of the stages of sleep and the frequency of seizure activity, paroxysmal sharp wave groups and localizing findings were analyzed. The sleep stages A to C (based on the Loomis scale) were reached for about equal duration by an EEG recording of 30–40 min; sleep stage D was reached only shortly and stage E was not observed. Pathological EEG findings appeared for the most part in the sleep stages A and B. Localized findings were pronounced in stage C. No significant differences pertaining to the occurrence and form of EEG patterns were found between patient groups with primary generalized seizures, psychomotor seizures or those with unclarified disturbances of consciousness. The combination of the short sleep EEG following 24h of sleep deprivation with subsequent use of the additional provocative methods of hyperventilation, photostimulation and hydration, yielded, in all, new information in 50% of the patients. Each of these additional methods contributed nearly equally to this information.
10 citations
01 Jan 1978
TL;DR: Depressed patients have REM sleep period times comparable to normal subjects, and in the depressives, as with normal, REM time does not significantly change across REM periods.
Abstract: Publisher Summary This chapter describes the application of clinical engineering in psychiatry. Intensive research has led to the acceptance of all-night electroencephalographic (EEG) and electro-oculographic (EOG) sleep recordings as a useful diagnostic technique. The automatic analysis of electroencephalograms requires the capability to recognize phasic events, events that vary from less than 5 s to several seconds in duration and that consist of one to several cycles; they are alpha waves, beta waves, delta waves, and sigma sleep spindles. Rapid-eye-movement (REM) sleep periods can be characterized by the three conceptually independent parameters: REM time, a tonic measure; (2) REM frequency, phasic characteristics; and (3) REM size, phasic characteristics. Depressed patients have REM sleep period times comparable to normal subjects, and in the depressives, as with normal, REM time does not significantly change across REM periods.