The brain needs ready access to the information, plans, and procedures it will be using to solve complex problems. This collective task knowledge is known as a task set. But the task set is not always immediately available.
Returning to a hard task comes with a 'restart' cost where we first have to spend time and mental effort getting back into our task before making progress. It is then essential to create time and space for hard tasks.
When we multitask, the tasks use shared cognitive resources, such as working memory, It makes the tasks compete for the shared resource and interfere with one another.
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