A simple "pubmed near infrared brain" web search will yield enough results to dispel your concerns somewhat. Overdosing is of course not desirable, so yes, don't use a 10W laser for several minutes. There are plenty of therapeutic options which make it hard to overdose.
Since you mentioned wage slaving - I chose coding performance as an example, but I could also have mentioned improved guitar playing skills. Or being a better listener. On average, I don't code that much more now, maybe 6h per day (as a freelancer, there's also lots of other things to do).
Since you mentioned wage slaving - I chose coding performance as an example, but I could also have mentioned improved guitar playing skills. Or being a better listener. On average, I don't code that much more now, maybe 6h per day (as a freelancer, there's also lots of other things to do).