What does "hot spot" mean?
In this context, "hot spot" (also written as "hotspot") is used informally to mean a place of high or significant activity. Thus, we can understand "dopamine hot spots" to mean "areas" or "places" with significant dopamine activity. "Hot spot" is also used to describe popular places of entertainment or socialization. Ex: We have many dopamine hotspots in our brain. Ex: I can't wait for my friends to visit me! I'm going to take them to all the hotspots in my city.
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