Our capacity to juggle several tasks at once is among the most important capabilities of the human cognitive system.

Just consider a typical day in the life of a modern human: you glance at your phone while waiting for coffee to brew, skim headlines while half-listening to a podcast, mentally rehearse a client pitch while walking your child to school, reply “noted” on Slack during a meeting while updating a slide deck, check your bank balance while standing in line, and, in a moment of entirely optional productivity theatre, scroll through a friend’s Facebook feed to see what their cat had for breakfast (admittedly, not the most important addition to our already heavy repertoire of multi-tasks).

If these familiar episodes of multitasking barely register as effort, it is because they have been absorbed into habit, woven into the fabric of daily life, quietly showing how often we coordinate competing goals, priorities, and impulses at once. For all the noise about AI agents, it is worth remembering that human agents remain remarkably capable.

Get more insights from Tomas Chamorro-Premuzic

Dr. Tomas Chamorro-Premuzic is a professor of organizational psychology at UCL and Columbia University, and the co-founder of DeeperSignals. He has authored 15 books and over 250 scientific articles on the psychology of talent, leadership, AI, and entrepreneurship. 

That said, generative AI and AI agents add yet another layer of temptation to multitask, and a respectable excuse for doing so. Now we can draft an email while an agent prepares slides, ask a chatbot to summarize a report while we skim LinkedIn, generate code while answering Slack, or prompt three models at once while half-editing a memo. This feels like augmented productivity, but often becomes cognitive diffusion or an increase in work intensity. As I illustrated in I, Human, when machines take over fragments of thinking, we become supervisors of many shallow streams rather than authors of one coherent argument. The result is not just intellectual sloppiness, but a steady erosion of focus, as attention shifts from solving a problem to managing tools that promise to solve it for us.

Subscribe to the Daily newsletter.Fast Company's trending stories delivered to you every day

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

SIGN UP

Privacy PolicyFast Company Newsletters

A bad rap

To be sure, multitasking tends to get a bad rap, especially among cognitive psychologists and behavioral scientists. This skepticism is well grounded. In a widely cited meta-analysis, researchers showed that alternating between tasks produces measurable “switch costs” in both speed and accuracy, even when tasks are simple. Subsequent research also found that heavy media multitaskers performed worse on tests of attention control and working memory, suggesting that frequent task-switching may erode the very cognitive filters that make focus possible. A more recent synthesis including examination of social media effects linked media multitasking during studying to significantly poorer academic outcomes. More recent neuroscientific evidence also shows that habitual multitasking is associated with reduced grey-matter density in regions linked to cognitive control, and some scholars have pointed out that multitasking deducts the equivalent of 10-IQ points from our performance and is therefore more debilitating than smoking weed (presumably minus the benefits or self-perceived creativity!).

Taken together, the evidence is rather compelling: multitasking is not a sign of superior efficiency but a tax on attention, trading depth for the comforting illusion of productivity. It makes us feel busy, sometimes even clever, yet especially for complex, analytical, or creative work it is usually worse than doing one thing well at a time, or learning to focus.

“Supertaskers”

And yet, that is not to say that we are all equally bad at multitasking. In fact, as in most areas of cognition, there are meaningful individual differences. A small but influential line of research has even identified a group sometimes labelled “supertaskers.”

© Fast Company