I read "probably" as implying uncertainty, but I concur with his assessment. When I was around 20-25 I used to program or game while watching TV while listening

I read "probably" as implying uncertainty, but I concur with his assessment. When I was around 20-25 I used to program or game while watching TV while listening to music, and it felt good because my brain craved overstimulation during that period. In retrospective, my main focus was the computer, the distant second focus was the TV, and the background noise was the music. I wasn't gaining a lot by doing the three at once.