ExpHub - Prashant Kirad

Slow, controlled breathing (roughly 5-6 breaths per minute for a few minutes) produces a measurable, reproducible shift toward parasympathetic activity — a genuine quick-reset tool backed by a psychophysiology review, even though long-term effects remain thin. The 'work in blocks, take breaks' idea, shorthanded here as a '90-20 rule,' traces to Kleitman's 90-minute ultradian rhythm — solid for sleep, more speculative when extended to waking alertness; the precise figure is a practical rule of thumb, not biological law. What holds up is simpler: attention wanes with time-on-task, and a break restores it. Trataka has a body of small, encouraging studies (working memory, selective attention, cognitive flexibility, measured with tasks like the Corsi block-tapping test or the Stroop test), but with modest samples (30-40 people), inconsistent protocols across studies, and no large trial yet — promising, not established. The 'dopamine overload' and 'default mode network' framing oversimplifies more complex neuroscience: not wrong outright, but well beyond what a 30-second explanation can honestly cover.