When you switch tasks, part of your attention stays behind — still chewing on the unfinished thread. Researchers call it attention residue, and full recovery averages over twenty minutes. Every 'quick check' restarts that clock.
The mind does not context-switch like a computer; it drags the previous goal set along. After answering one message mid-study, the message keeps occupying working memory while you read — comprehension drops while effort feels the same, so the damage is invisible to the person doing it.
Study material is high-interference: similar concepts compete in memory. Switching between physics and chemistry mid-session is worse than switching between either and a walk, because the residues collide. One subject per block is not preference — it is interference management.
First, single-tab sessions: one thing open, phone in another room. Second, shutdown rituals: write the next step down before any switch, which lets the brain release the thread. Third, batch the small stuff: messages, email and admin get their own block, never the gaps between study blocks.
Steady instrumental sound is fine for most people; lyrical or novel audio competes for the same verbal channel as reading. If comprehension drops, drop the lyrics first.
Breaks between bounded blocks are recovery, not switching — the block ended deliberately, so there is no open thread leaving residue.
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