Probably the crux of our discussion is the speed of climate change. Is it changing on 3 millions years timescale, tens of thousands or hundreds? If it changes in millions of years then it seems that its effect on intelligence evolution is negligible and I thing it is what you mean.
However, the last few million years there were constant Ice ages, and the climate changed at least every 10 thousand years. Moreover, as Budyko wrote, the colder is climate, the less stable it is. We could see such short term instability 20-10 000 from now when event like Young Drias (sudden short cooling for around a thousand years) had happened.
So, given that human life span is much longer than the one of mice, climate change happened on the duration of 10-100 generations, and it could create enough selective pressure to increase universality—or to give success to the species which have such universality.
So, given that human life span is much longer than the one of mice, climate change happened on the duration of 10-100 generations,
Climate change has never happened in any duration of 10 human generations since the emergence of humans, even the Younger Dryas event like you mentioned was much longer than that, being easily 40 generations long. Excluding the last 200 years which are far too recent to have had significant effects on evolutionary development.
However, the last few million years there were constant Ice ages, and the climate changed at least every 10 thousand years.
The climate before the last glacial maximum has not ‘changed at least every 10 thousand years’, even the shortest interglacial periods are much longer than that.
Where are you getting these erroneous facts from?
Considering I’ve only spent, at most, an hour on all my comments so far, that I could find all these errors of fact and logic really lowers the credibility of your paper. You and your coauthors need to seriously reevaluate the arguments and clear up erroneous facts.
You need to look not on the duration of the YD, but on the time of the transition to YD. It was very quick. “The change was relatively sudden, taking place in decades, and it resulted in a decline of temperatures in Greenland by 4~10 °C (7.2~18 °F),[3] and advances of glaciers and drier conditions over much of the temperate Northern Hemisphere.”
Presumably you got this claim from the wikipedia article, if you actually read the paper cited this would have been revealed to be a misleading claim as the first figure prominently shows.
Fig. 1 shows some oscillations lasting a few decades in length but by the nature of oscillations they reverted back to the baseline within that time period. Actual lasting changes in the measured values primarily occurred in the period from roughly 14.7 ka BP to 12.8 ka BP.
In fact this interval is prominently highlighted by the paper authors via a different background color on the chart.
Since I am not your editor I will leave off here and let your editor correct any further mistakes.
Probably the crux of our discussion is the speed of climate change. Is it changing on 3 millions years timescale, tens of thousands or hundreds? If it changes in millions of years then it seems that its effect on intelligence evolution is negligible and I thing it is what you mean.
However, the last few million years there were constant Ice ages, and the climate changed at least every 10 thousand years. Moreover, as Budyko wrote, the colder is climate, the less stable it is. We could see such short term instability 20-10 000 from now when event like Young Drias (sudden short cooling for around a thousand years) had happened.
So, given that human life span is much longer than the one of mice, climate change happened on the duration of 10-100 generations, and it could create enough selective pressure to increase universality—or to give success to the species which have such universality.
Climate change has never happened in any duration of 10 human generations since the emergence of humans, even the Younger Dryas event like you mentioned was much longer than that, being easily 40 generations long. Excluding the last 200 years which are far too recent to have had significant effects on evolutionary development.
The climate before the last glacial maximum has not ‘changed at least every 10 thousand years’, even the shortest interglacial periods are much longer than that.
Where are you getting these erroneous facts from?
Considering I’ve only spent, at most, an hour on all my comments so far, that I could find all these errors of fact and logic really lowers the credibility of your paper. You and your coauthors need to seriously reevaluate the arguments and clear up erroneous facts.
You need to look not on the duration of the YD, but on the time of the transition to YD. It was very quick. “The change was relatively sudden, taking place in decades, and it resulted in a decline of temperatures in Greenland by 4~10 °C (7.2~18 °F),[3] and advances of glaciers and drier conditions over much of the temperate Northern Hemisphere.”
Presumably you got this claim from the wikipedia article, if you actually read the paper cited this would have been revealed to be a misleading claim as the first figure prominently shows.
See https://escholarship.org/uc/item/6n89h7c3#metrics
Fig. 1 shows some oscillations lasting a few decades in length but by the nature of oscillations they reverted back to the baseline within that time period. Actual lasting changes in the measured values primarily occurred in the period from roughly 14.7 ka BP to 12.8 ka BP.
In fact this interval is prominently highlighted by the paper authors via a different background color on the chart.
Since I am not your editor I will leave off here and let your editor correct any further mistakes.