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.
However, the P300, as acognitive component, is known to vary with a subjectâs fatigue level [5].Since the signal level of a P300 potential compared with the signal level of noises isvery small, an ï¬t method of extracting and classifying the P300 component from theEEG signal is desirable.hile the P300 is elicited in many ï¬t ways, the mostcommon factors inuencing it are two stimulus-discrimination tasks presented to the sub-ject in an unknown fashion. One occurs infrequently (i.e., target) and the other frequently(i.e., non-target). The P300 has been shown to be fairly stable in locked-in patients.