How does multitasking affect focus?

Andrew Huberman explains that multitasking has a distinct physiological signature, notably increasing the neurotransmitter epinephrine (adrenaline). This rise in adrenaline can help initiate action, making multitasking somewhat useful before engaging in focused or goal-directed behavior. For instance, cleaning your house while checking your phone might help you gear up to sit down and begin focused work.

However, Dr. Huberman cautions against multitasking during any goal-seeking or task-focused activities. Maintaining visual focus, specifically contracting your visual field to a fine point, can significantly enhance cognitive attention and your ability to stay concentrated on your goals. He suggests practices like looking at a dot or a line for 30 to 60 seconds before diving into work to boost focus 1.