There is every chance the 3 weeks also changed personality as well. Two further groups are required for English and 3 week later English and Germany and 3 weeks

There is every chance the 3 weeks also changed personality as well. Two further groups are required for English and 3 week later English and Germany and 3 weeks later German to compare personality drift over time. I am not saying it might produce any results but we are trying to prove ourselves wrong (because in science you can't prove yourself right) and as such with the hypothesis that personality is not impacted by language and we have introduced time to remove short term memory of the test we have to think about its potential impact too. Would be interesting to do the tests back to back as well, if we think short term memory of the test impacts it that would also be worth testing in both orders to see if one test influences the other.