The reason is simple: This is not 100% true multitasking. All system resources are available to all applications, with the system assuming the role of a traffic controller, giving preference to some tasks and less preference to others as needed.25 This is essentially how our brains manage multiple tasks that require cognitive control: the prefrontal cortex serves as a traffic controller to facilitate goal management by rapidly switching between neural networks associated with each of the tasks. It is fascinating to read Apple’s description for why they went this route, rather than implementing
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