The amplitude measurements (stddev) are indicative of how much alpha activity is occurring in the subject. However, the amplitude values for beta do not truly reflect the amount of mental activity occurring with the eyes open. What is a possible explanation for this observation?

The alpha and beta waves are out of sync which impairs the actual capture of the two.

Explanation:

The question above presents a situation in which many activities are happening in the beta frequency, since they can reflect a mental activity that responds to visual stimuli, which are captured by the open eyes. However, alpha waves are disproportionately present. This, in addition to causing a little cancellation of the beta wave, causes the capture of the waves to be impaired and only the one that this dominant is captured with more precision.

the earthquake in haiti was a magnitude of 7.0 according to the u.s geological survey yet the smaller earthquake in haiti killed more than 200,000 and left more than 1.2 million people homeless. the chile earthquake was a magnitude of 8.8 and 500 times more stronger but chile's earthquake only injured 712 people.

the answer is "meiosis ii in the mother".

the procedure of meiosis includes two divisions of the hereditary material. the main division is known as the decrease division – or meiosis i – on the grounds that it lessens the quantity of chromosomes from 46 chromosomes or 2n to 23 chromosomes or (n depicts a solitary chromosome set). in people, the decrease division results in two sperm cells each with 23 chromosomes or an egg cell with 23 chromosomes and one disposed of polar body. the second division – or meiosis ii – is called equational division. the two sperm cells split again creating four sperm cells, each with 23 or n chromosomes. in oogenesis, the egg cell and polar body partition to shape the ovum and two extra polar bodies. along these lines, the posterity are guaranteed to get one portion of the chromosomes from the mother and one half from the dad.