Karl, I don't know if there's a connection to your use of that machine or not. But other studies say the same thing:

"Parallel results indicating that reduced oxygen levels can also promote the survival, proliferation, and catecholaminergic differentiation of CNS stem cells (Studer et al., 2000) suggests that neural stem cells may exhibit a conserved response to reduced oxygen levels."

From:

Culture in Reduced Levels of Oxygen Promotes Clonogenic Sympathoadrenal Differentiation by Isolated Neural Crest Stem Cells

http://www.jneurosci.org/cgi/content...act/20/19/7370

http://www.jneurosci.org/cgi/content...act/20/19/7377

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"These results suggest that although hypoxia induces an increase in the extracellular dopamine levels (hence, an apparent increase in the activity of the dopaminergic neurons), this increase is not the result of an increase in dopamine release itself, but rather the result of inhibition of the dopamine reuptake mechanism."
http://www.blackwell-synergy.com/doi...1991.tb08249.x