In his fine and readable book ‘Brain Rules,’ molecular biologist and Professor John Medina speaks from both research and personal experience about the human attention span. That's Medina above delivering a "Authors@Google" talk.
The good news for general session planners is that adults have attention spans. The bad news is, don’t count on them being much longer than about 10 minutes.
Does that mean you should start programing 10-minute general sessions?
Well, no. Medina’s suggestion for dealing with 10-minute human attention spans is more nuanced than that.
“I decided that every lecture I’d ever give would come in discrete modules,” Medina writes in Brain Rules. “Since the 10-minute rule had been known for many years, I decided the modules would last only 10 minutes. Each segment would cover a single core concept--always large, always general, always filled with ‘gist,’ and always explainable in one minute. Each class was 50 minutes, so I could easily burn through five large concepts in a single period. I would use the other 9 minutes in a segment to provide a detailed description of that single general concept. The trick was to ensure that each detail could be easily traced back to the general concept with minimal intellectual effort.”
When the ten minutes ends Medina wraps up the topic and baits the hook again with the next topic, he writes. The brain likes hierarchy and it processes meaning before detail. Science demonstrates that repetition builds memory, so repeating key concepts maximizes memory.
Topic hooks must trigger emotion, fear, laughter, happiness, nostalgia, incredulity, etc. Narratives work if they’re strong and to the point.
Hooks can be a joke or story or anecdote, but they must be relevant. And tying modules together is smart.
Medina’s insights as a researcher and lecturer hold three lessons for general session planners:
- Program your general sessions with 10-minute rule in mind.
- Have a preference for presenters mindful of the 10-minute rule.
- Include “mindbreaks” in between presentations.


