we use different brain regions to process them, the tasks aren’t competing for the same mental resources. There is a tipping point to attentional space, of course—doing too many habitual tasks at the same time will cause your attentional space to become overloaded. This is especially true if what you’re doing isn’t totally automatic and requires frequent mental intervention. Ultimately the point is this: the number of habitual tasks we can fit into our attentional space is much higher than the number of demanding ones.
