In this study characteristics of cardiac functioning were investigated in nine subjects during their nocturnal sleep. The pre-ejection period and the high frequency component of heart rate variability were used as indices of cardiac sympathetic and parasympathetic activity of the autonomic nervous system respectively. Heart rate and the autonomic indices were assessed across physiological deter...

1875 Scrima’s Hypothesis Revisited—Deliens et al INTRODUCTION A positive contribution of post-learning sleep in the consolidation of new information in long-term memory is now widely recognized.1-7 Beneficial effects of post-learning sleep have been highlighted for various memory systems, such as verbal declarative memory,8,9 emotional memory,10,11 or spatial learning,12 and non-declarative mot...

Objective: To evaluate the use of a totally implantable radiotelemetry system for recording the sleep electrocorticogram (ECoG) of a small new world primate, the common marmoset (Callithrix jacchus) without restraint during data collection. Methods: Under anaesthesia a telemetry transmitter, which allowed the recording of a single ECoG channel, was implanted intraperitoneally. This system allow...

BACKGROUND Arousal in response to increased airflow resistance during sleep, especially rapid eye movement sleep (REM), could be an important protective mechanism against asphyxia. METHODS The arousal response to the application of an external inspiratory resistance of 25 cm H2O/l/s was determined during REM and non-REM sleep in ten healthy men. RESULTS The number of arousals occurring with...

Just as the study of great apes aids in the understanding of early hominid evolution, so too can contemporary dream research help in the understanding of ancient hominid dream life and cognitive evolution. It has been proffered that a major leap forward in the cognitive evolution of hominoids may first have occurred in the building of nests, and a second major step may have been the full transi...

PURPOSE The purpose of this study was to characterize the relationships between nocturnal intraocular pressure (IOP) variations and sleep macrostructure in healthy subjects. METHODS This was a cross-sectional study conducted in a center with shared expertise in chronobiology. Twelve healthy volunteers (22.3 ± 2.3 years) underwent a 24-hour IOP measurement session. The IOP variations of one ey...

Humans have been aware for thousands of years that sleep comes in many forms, accompanied by different kinds of mental content. We review the first-­‐person report literature on the frequency and type of content experienced in various stages of sleep, showing that different sleep stages are dissociable at the subjective level. We then relate these subjective differences to the growing literatur...

The usual method for sleep stages classification is visual inspection method by sleep specialist. It uses eight EEG channels (O1, O2, T3, T4, C3, C4, Fp1 and Fp2), EOG and also EMG for sleep analysis. This method consumes more time (hours) for sleep stages classification. Some brain disorders like narcolepsy (excessive day time sleepiness) requires real-time monitoring of sleep states which is ...

Sleep is a growing area of research interest in medicine and neuroscience. Actually, one major concern is to find a correlation between several physiologic variables and sleep stages. There is a scientific agreement on the characteristics of the five stages of human sleep, based on EEG analysis. Nevertheless, manual stage classification is still the most widely used approach. This work proposes...