N-back Sound's calculation

N-back calculation Brain Training N-back, which is said of the brain training others, and give a huge impact on the working memory In its N-back, large particularly influential "voice calculation" In N-back traditional, remember numbers that appeared, it was only going to answer two, the number of front three. Things that appear is not a number, this app, formula. In addition to that, we need to hear in the ear. It can be said impact on the brain is greater. If the 2-back of the (previous two) Example: 3 1 = 4 5 4 = 9 2 0 = ← answer the answer of the previous two for the first time here. In this case is the answer of the previous two "4" 7 1 = ← answer the answer of the previous two as well. In this case is the answer of the previous two "9" ↓ loop below