Singletasking

**SINGLETASKING** *How to Get More Done, Build Better Relationships, and Find Greater Happiness by Doing One Thing at a Time*

By Devora Zack

**Estimated Reading Time:** 35 minutes

**What You'll Learn** Why multitasking is a neurological impossibility that damages your productivity, relationships, and well-being. You will learn a complete system for reclaiming your focus, managing your environment, deepening your connections with others, and rediscovering the satisfaction of being fully present in your own life.

**Who This Book Is For** Anyone who has ever checked a phone during a conversation, eaten lunch while answering emails, or felt exhausted at the end of a day despite being busy every minute. This book is for people who sense that constant task-juggling is costing them something important but cannot articulate what that something is.

The central argument of this book is deceptively simple: the human brain can only process one stream of conscious information at a time. Everything we call multitasking is actually rapid task-switching, and this switching carries a heavy price. Zack grounds this claim in neuroscience. The prefrontal cortex, the part of the brain responsible for executive function and conscious attention, operates as a bottleneck. When you attempt to process two attention-demanding tasks simultaneously, your brain does not handle them in parallel. It toggles between them, activating one set of neural circuits while suppressing another, then reversing the process a fraction of a second later. This toggling happens so quickly that it feels like simultaneity, but the underlying mechanism is sequential. The cost of each switch is measurable. Researchers call it "switch cost" or "attention residue." When you move from Task A to Task B, a portion of your attention remains stuck on Task A, meaning you are never fully engaged with either activity. Studies show that task-switching can reduce productivity by up to 40 percent. It increases error rates, extends completion times, and elevates stress hormones. Heavy media multitaskers perform worse on tests of cognitive control, are more easily distracted by irrelevant stimuli, and struggle more with filtering out useless information. This is not a minor inefficiency. It is a fundamental mismatch between how we are designed to function and how we are trying to live. Zack extends this argument beyond productivity into the realm of human connection and personal fulfillment. When you split your attention during a conversation, you are not just being rude. You are literally incapable of fully hearing what the other person is saying. Subtle emotional cues, tone shifts, and unspoken meanings pass you by. The relationship suffers in ways you may not consciously register but that accumulate over time. The same applies to your experience of your own life. When you eat while scrolling, walk while…