Some of the causes in children for Dark circles under eyes in children may include: 1  Lack of sleep. 2  Nasal congestion. 3  Black eye due to trauma.  Frequent eye 1  rubbing. Hayfever.  Inherited 1  trait. Dehydration. 2  Allergies. 3  Eczema. Phenol sulfotransferase deficiency.
From From P300 Development across the Lifespan: A Systematic Review and Meta-Analysis. The latency and amplitude of the P300 response may vary as a function of age. The P300 (P3) wave is an event related potential (ERP) component elicited in the process of decision making.pplications in brain-computer interfacing (BCI) have also been proposed. The P300 has a number of desirable qualities that aid in implementation of such systems. First, the waveform is consistently detectable and is elicited in response to precise stimuli.
1). Figure 1. A sample EEG recording showing a focal spike typical of a seizure. There are several different ways to conduct an EEG: 1  Standard EEG recording is done in the office and usually lasts an hour. 2  You may be asked to do a sleep-deprived EEG, which requires you to have only 4 hours of sleep.Abnormal brain waves may appear when the body is stressed or fatigued. This exam usually takes 2 to 3 hours. You will be given specific instructions regarding food, drink, and medications that may need to be avoided.). Figure 1. A sample EEG recording showing a focal spike typical of a seizure. There are several different ways to conduct an EEG: 1  Standard EEG recording is done in the office and usually lasts an hour. 2  You may be asked to do a sleep-deprived EEG, which requires you to have only 4 hours of sleep.