Pashler's attention model

Pashler's attention model suggests that our brain has a limited resource for focusing on tasks, like a spotlight that can only illuminate a few things at once. When we pay attention to different activities, these tasks compete for this limited resource. If tasks are simple or well-practiced, they require less attention and can be handled simultaneously. However, complex or new tasks demand more attention, making it harder to do multiple things at the same time without errors. Essentially, the model explains how focus and mental effort influence our ability to multitask effectively.