Concentrate too hard?

Is it normal to be able to concentrate too hard to the point where you lose your sense if visual concentration?

Like when someone is speaking and, genuinely interested, Your vision turns into more of a picture than a constant video.

While I still see motion during the sort of spaced out mode of mind, it seems like I am not focusing on one partnof the picture but the whole.

Any thoughts?

Post-script: really hard to explain.