Can any anthropologists/evolutionary biologists answer this question? Science has shown that during Marine Isotope Stage 6, for thousands of years most likely, humanity was reduced to probably no more than ten thousand people at a time and most lived off the ocean and nearby plants on the coast. I've heard that this event can be considered a bottleneck for our species. Has there been any studies or other papers done that try to determine to what extent if at all, or even how, this event has changed human behavior. This is one of the only sources I could find on the subject. https://instruction2.mtsac.edu/jkido/Biology%201/Lec%20Handouts%20&%20Articles/Exam%204/When%20the%20Sea%20Saved%20Humanity.pdf
Other than this I can't really find much on the subject that goes any deeper.