The discovery in 2007 of a “bottleneck in the brain” showed that multitasking is not productive.
Doing even just two tasks, both very simple, involves negotiating three bottlenecks in the brain.
- Deciding which we want to give our primary attention to. The researchers called this /the attention blink/.
- Holding two sets of information in our limited short term memory. The researchers called this /the cognitive limit/.
- Selecting a response to the situation and then deciding which selection to implement first. The researchers called this /the choice delay/.
Concentrating on one thinking task at a time and getting it finished before starting another was also shown to reduce the amount of the stress hormone cortisol in the body.
And – just in case you need further convincing – to produce chemicals in your brain that aid cognitive processes — most especially creative thinking.