Let me shed some light here. For the record:
I have a masters in psychology and a six sigma black belt in statistical methodology from Motorola.
I have a working familiarity with French, Spanish and Portuguese
So this does give me credence to speak as a subject matter expert. While these experiments show initial promise, we really need to wait a bit - to see if the results are replicated and other variables are tested in future experiments. The researchers might be showing a correlation
Correlation is a statistical measure (expressed as a number) that describes the size and direction of a relationship between two or more variables. A correlation between variables, however, does not automatically mean that the change in one variable is the cause of the change in the values of the other variable.
rather than a causation variable
Causation indicates that one event is the result of the occurrence of the other event; i.e. there is a causal relationship between the two events.
And there could really be other unidentified variables causing the results.
Also, the article doesn't really say what proficiency in the second language the participants had and whether it was measured beforehand via conventional language testing methods.
I would also like to see this expanded to measure different language types and their differences. Let's take western English speakers as our knowledge and testing base. Would romance languages (i.e. French, Italian, Portuguese, Spanish) produce significant differences in regards to Asian languages (i.e. Chinese, Japanese or Korean) or middle Eastern languages (i.e. Arabic)?