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It effects behavior and is a form of work. Take work out you have more stimulus. Work can be healthy though. Perspective affects mood, yes. Behavior affects emotion. It is the neuron firing pleasurably, due to the transmitter from worldview.
so... Bro light science would take into factors, source/color of light, how much you are blinking, and how much sunlight you're getting. It is good to increase neuroplasticity, which means doing the hard work. I recommend sunlight.