According to a 2010 study by neuroscientists at the French medical research agency Inserm, if a person is focusing on two tasks simultaneously, each side of the brain tackles a different task. This means the human brain can only handle two tasks at a time.
Taking on more tasks results in an increased chance of errors. Rather than spreading your focus thin between multiple projects, try dedicating a 20-minute slot of time to one task, then switch to the next one. Not only will you notice an increase in productivity, but you’ll also see a rise in your level of innovative thinking.