Losing concentration


During some kind of repetitive task which doesn't involve thinking, I lost my
concentration and forgot what I was doing. When I told someone about this I
said 途中でぼけてしまった but I wonder if that is the best way to describe such an
occurrence. 途中で集中しなくなった sounds quite odd to me somehow. 集中を失った would be a
translation of "lose concentration" in English but I'm not sure that is good
Japanese. Is 途中で間を抜けた or something like that too strange?




I think

> 途中でボケてしまった

is a valid way to relate the fact that you lost your concentration, but I
guess it is rather colloquial.

You could also say

> 気が逸れてしまいました

which could mean that something else _caught_ your attention, but I guess this
"something" could just be another thought, in which case it would just mean
that your _attention drifted_.

If you want to use 集中, then I think

> 集中ができなくなった

is better.

Finally, 集中を失った seems to exist, but it sounds more like a medical condition
and I don't think it quite fits the situation here.

