Sleep eeg
Ohtahara syndrome, now termed early infantile epileptic encephalopathy (EIEE) is a devastating diagnosis of early infancy. Here we'll give a brief overview on the more common ones that have a particular EEG signature. You won't often try activation techniques in babies, but prolonged crying can cause a hyperventilation response, and if you do attempt photic stimulation, a slow driving response of 1-3 Hz is seen starting around 6 months of age.įrom infancy into adulthood, there are a number of classic EEG patterns and syndromes that you should be familiar with, because each has different treatment requirements and prognosis. The example below is from a 4 month old healthy baby note the high amplitude vertex wave, rather prolonged spindle in the first half of the page, and the asynchronous and poorly formed spindle near the end of the page. In the first months of life, up to half a baby's sleep time can be REM sleep, but this proportion decreases to about a third by 1-2 years of age. With spindles, vertex waves in stage I, and K complexes in stage II arise, and can be extremely prominent in children vertex waves, in particular, can be very sharp appearing and come in long runs, so don’t confuse them for B(I)RDs or seizures. Regarding sleep, by 2 months of age stage II sleep spindles develop initially they can be very prolonged (up to 15 seconds at a time), and can remain asynchronous till up to 2 years of age. These tracings have their sensitivities lowered from the standing 7uV/mm to between 10-20uV/mm for clarity as, generally, pediatric tracings are higher amplitude than adults. Below are a few examples of normal waking tracings at various time points for infants note the general trend, over time, of less delta and more theta, and a better formed anterior-posterior gradient. By 1 year of age, the expected PDR is 6 Hz. In drowsiness, though, the background is usually still very slow and high amplitude, with a lot of 1-2 Hz activity up to 200uV in amplitude, particularly early on in the first year of life. Early in this timeframe, there is significant amounts of delta activity, but as baby's approach one year of age theta frequencies become increasingly admixed. After this point, a PDR of 4-5 Hz arises by 6 months of age during wakefulness.
The recording should be continuous and symmetric, but not particularly reactive to eye opening until 2-4 months. Correlation of visuospatial memory ability with right parietal EEG spindling during sleep.The first year of life on EEG is characterized a preponderance of slow, high amplitude delta activity. Sleep slow oscillation and spindles are related to self-directedness in subjects with high intelligence.
Besides significantly enriching our factual knowledge of the composite relationship between brain function, structure and behaviour, this approach also hides expectedly multiple possibilities for developing new diagnostic tools in different psychiatric disease.
We also plan to correlate these data with volumetric Magnetic Resonance Imaging assessed brain morphology. We endeavour to exploit the broad opportunities offered by the latest quantitative EEG analysis methods to reveal the hitherto hidden aspects of the central neural activity in function of age, cognition, personality and mental health. The focus of our scientific interest is the research of sleep related brain electric activity correlates of aging, general and specific cognitive abilities, personality and of trait-like affective styles, including attachment. Sleep dependent brain electric activity as a reliable indicator of the individual brain functional neuroanatomy has been proved to have high internight reliability, consequently representing an ingenious instrument for revealing individual differences. Research > Topics > Sleep EEG, cognition and personality