After a yawn in my session today the circle got bigger and stayed that way for a long time. What puzzled me is that the line on the graph was so close to the baseline during that time.
When the circle is small, the line dips below the baseline so I expected the line to go above the baseline when the circle got big. I am assuming the bigger the circle, the more my frontal cortex is oxygenated therefore the higher the line on the graph should go.
What information am I not knowing here?
Thanks.

The movement of the circle is not 1:1 with the graph. The circle changes relative to the change in score but it's a little faster than the graph, so it's more visualizing the current changes rather than your position on the graph. BTW grab the most recent update for the extension, I've improved on most of the features and visuals across the board, nicer audio visualizer (and fixed the audio feedback that I somehow broke), circle and hill climb animations, with audio feedback options added for other modes as well.