> they concluded that effortful, goal-directed tasks use only 5% more energy than restful brain activity
That parallels the other conclusion that we don't really use that much more energy when at rest and when exercising. If energy isn't used by movement, it gets used for whatever to consume the predetermined daily energy budget.
Our bodies seem to be really set up to work with a consistent fixed energy amount and dealing with allocation of it instead of optimizing idle efficiency. We don't idle.
That parallels the other conclusion that we don't really use that much more energy when at rest and when exercising. If energy isn't used by movement, it gets used for whatever to consume the predetermined daily energy budget.
Our bodies seem to be really set up to work with a consistent fixed energy amount and dealing with allocation of it instead of optimizing idle efficiency. We don't idle.