Hi av8boy,
Reference? No, lost it. It was an IFATCA study, so worth asking them. They have a whole lot of this stuff.
One of the times that we seem to be most prone to error is immediately after a busy session or push of traffic. Errors don't seem to happen as often as they "should" when we are VERY busy, probably because we are concentrating and are "Stepping up a gear".
When the push is over, we tend to relax a bit, and "take our foot off the gas". And therein happen many of our errors.
Rgds BEX