Singletasking: Get More Done—One Thing at a Time: Summary & Key Insights

The cultural belief that multitasking is a superior skill is deeply entrenched, yet neuroscientists and psychologists have repeatedly shown that it’s a myth. In this chapter, I confront that myth head-on. When people say they’re good at multitasking, what they’re really saying is they’re adept at switching from one task to another rapidly—and every switch costs something.

Research confirms that each shift incurs a cognitive penalty: time, energy, and accuracy all drop as our brain throttles between tasks. We think we’re saving time, but we’re actually fragmenting it. Cognitive scientists have measured these micro-delays and discovered they add up to significant decreases in productivity, sometimes cutting efficiency by up to forty percent. Even simple tasks—checking an email while writing a report, glancing at a phone during a meeting—interrupt our mental continuity.

I share stories from organizations that believed in multitasking as an emblem of pride, only to find higher burnout, poorer decisions, and less innovation. The truth is simple: when your mind is split, your work is diluted. Multitasking doesn’t make you faster; it makes you scattered.

In understanding this, we begin to realize that singletasking isn’t an outdated notion—it’s a smart correction to a modern misunderstanding. When I say focus on one thing at a time, I’m not asking you to work slower. I’m guiding you to work smarter by letting your brain fully engage with what’s in front of you without the mental tax of constant toggling. Once you let go of the myth, the door opens to genuine productivity that feels effortlessly smooth rather than endlessly busy.

Before we can rebuild our focus, we must understand how attention actually functions. Human attention is limited—it’s not a river that flows endlessly but a spotlight that illuminates only one small area at a time. Neuroscience tells us that the prefrontal cortex can hold just a few pieces of information simultaneously, and each demand for ‘switching’ dims that spotlight.

When we try to multitask, what we’re forcing is rapid alternation, not true simultaneity. This switching activates the brain’s error-monitoring centers and drains glucose, causing fatigue and stress even if we don’t notice it consciously. More interestingly, the cost of switching is emotional as well as cognitive. Frequent shifts breed impatience and anxiety because our brains crave closure—finishing one thing before moving to another.

Once you understand this circuitry, everything about your day looks different. You see the futility of scrolling through messages while attending a meeting. You realize that focusing deeply doesn’t mean being perfect—it means aligning your biology with its natural rhythm. The human brain evolved for deep, sequential engagement, not parallel processing of endless inputs.

This insight becomes liberating. You stop feeling guilty for not keeping up with everything at once, and you start designing your work to respect your cognitive limits instead of defying them. You begin to treat attention as a treasure, not a commodity.