It's really "task-switching" - the brain cannot multitask
Multitasking
continues to be regarded as a required and prized skill because the
idea that the brain can focus on more than one task at a time still
prevails among students, employees, and employers in various settings
and workplaces. However, modern neuroscience and numerous studies have
shown multitasking is a fallacy. Although we can walk, talk, and
breathe at the same time, the brain can focus attention on one higher-level task at a time.
When we think we're multitasking, we are in fact task-switching - i.e.,
interrupting our attention from one task to pay attention to another.
Driving while talking on the phone is one example. While "multitasking"
may be a requirement of managing our responsibilities at home, on
campus, and in the workplace, interruptions and task-switching
compromise results and efficiency. Research shows there's a 50% increase in
error rate, and it takes twice as long to finish tasks. In the
workplace, the result is higher costs, inferior results, and more
stress.
To reduce time and improve efficiency, whenever possible, focus on and
complete one task at a time. As we often don't have that luxury, manage
the interruptions and your time in a way that best allows you to focus
effectively on one task before switching to another. Consider tracking
the number and degree of distractions and interruptions occurring
between tasks. Heightened awareness will contribute to enhanced time
management strategies and improved results. A record of interruptions
and distractions may also help to inform conversations as well as
improve conditions and efficiency in the workplace.
On the roadways, driving while talking - like drinking and
driving - yields tragic consequences.