The way you focus is by setting your sights on an immediate goal and a horizon that's close in. So dopamine starts to spike, which is enhanced by the neuroepinephrine spiking. Then if you also skip breakfast, have a cup of coffee, take L-tyrosine, that further enhances the dopamine. I don't recommend people take L- tyrosine every day. You're better off doing it with behavior and behavioral stuff and nutrition.

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